$CB
Chubb Ltd Stock $cb

$cb Overview Financials Valuation SEC Filings Company Website

2010 Q4 Form 10-K Financial Statement

#000119312511047473 Filed on February 25, 2011

Income Statement

Concept	2010 Q4	2010 Q3	2009 Q4
Revenue	$4.409B	$3.888B	$4.272B
YoY Change	3.21%	5.62%	20.54%
Cost Of Revenue	$1.971B	$1.887B	$1.900B
YoY Change	3.74%	0.11%
Gross Profit	$2.438B	$2.001B	$2.372B
YoY Change	2.78%	11.41%
Gross Profit Margin	55.3%	51.47%	55.52%
Selling, General & Admin	$502.0M	$433.0M	$486.0M
YoY Change	3.29%	-3.99%	9.46%
% of Gross Profit	20.59%	21.64%	20.49%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization		$607.0M
YoY Change		7.05%
% of Gross Profit		30.33%
Operating Expenses	$3.203B	$3.022B	$3.014B
YoY Change	6.27%	1.34%	4.76%
Operating Profit	-$765.0M	-$1.021B	-$642.0M
YoY Change	19.16%	-13.91%
Interest Expense	-$45.00M	$58.00M	-$84.00M
YoY Change	-46.43%	-3.33%	-23.64%
% of Operating Profit
Other Income/Expense, Net	-$27.00M	$25.00M	-$13.00M
YoY Change	107.69%	-149.02%	44.44%
Pretax Income	$1.134B	$835.0M	$1.161B
YoY Change	-2.33%	42.01%	985.05%
Income Tax	$133.0M	$160.0M	$208.0M
% Of Pretax Income	11.73%	19.16%	17.92%
Net Earnings	$1.001B	$675.0M	$953.0M
YoY Change	5.04%	36.64%	4665.0%
Net Earnings / Revenue	22.7%	17.36%	22.31%
Basic Earnings Per Share	$2.94	$1.98	$2.82
Diluted Earnings Per Share	$2.92	$1.97	$2.81
COMMON SHARES
Basic Shares Outstanding	334.9M shares	340.2M shares	336.5M shares
Diluted Shares Outstanding		341.9M shares

Balance Sheet

Concept	2010 Q4	2010 Q3	2009 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$772.0M	$487.0M	$669.0M
Short-Term Investments
Other Short-Term Assets	$1.511B	$1.678B	$1.521B
YoY Change	-0.66%	-2.84%	-1.17%
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$1.511B	$1.678B	$1.521B
YoY Change	-0.66%	-2.84%	-1.17%
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill	$4.030B		$3.814B
YoY Change	5.66%		5.3%
Intangibles	$634.0M
YoY Change
Long-Term Investments	$51.77B	$51.48B	$46.95B
YoY Change	10.26%	10.95%	15.79%
Other Assets	$769.0M	$873.0M	$1.154B
YoY Change	-33.36%	-29.25%	-37.11%
Total Long-Term Assets	$81.84B	$80.71B	$76.46B
YoY Change	7.04%	6.07%	8.42%
TOTAL ASSETS
Total Short-Term Assets	$1.511B	$1.678B	$1.521B
Total Long-Term Assets	$81.84B	$80.71B	$76.46B
Total Assets	$83.36B	$82.39B	$77.98B
YoY Change	6.89%	5.87%	8.22%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.958B	$2.721B	$2.349B
YoY Change	25.93%	14.62%	-10.85%
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$1.609B	$464.0M	$470.0M
YoY Change	242.34%	-8.84%	-39.74%
Long-Term Debt Due	$1.300B	$155.0M	$161.0M
YoY Change	707.45%
Total Short-Term Liabilities	$8.257B	$7.009B	$6.379B
YoY Change	29.44%	6.41%	-10.58%
LONG-TERM LIABILITIES
Long-Term Debt	$3.358B	$3.158B	$3.158B
YoY Change	6.33%	-4.91%	12.54%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$3.358B	$3.158B	$3.158B
YoY Change	6.33%	-4.91%	12.54%
TOTAL LIABILITIES
Total Short-Term Liabilities	$8.257B	$7.009B	$6.379B
Total Long-Term Liabilities	$3.358B	$3.158B	$3.158B
Total Liabilities	$60.38B	$59.54B	$58.31B
YoY Change	3.55%	0.77%	1.22%
SHAREHOLDERS EQUITY
Retained Earnings	$5.926B	$4.925B	$2.818B
YoY Change	110.29%	164.08%	3708.11%
Common Stock	$10.16B	$10.26B	$10.50B
YoY Change	-3.26%	-3.22%	-2.99%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$330.0M	$33.00M	$3.000M
YoY Change	10900.0%	725.0%	0.0%
Treasury Stock Shares	6.152M shares	1.548M shares	1.317M shares
Shareholders Equity	$22.97B	$22.85B	$19.67B
YoY Change
Total Liabilities & Shareholders Equity	$83.36B	$82.39B	$77.98B
YoY Change	6.89%	5.87%	8.22%

Cashflow Statement

Concept	2010 Q4	2010 Q3	2009 Q4
OPERATING ACTIVITIES
Net Income	$1.001B	$675.0M	$953.0M
YoY Change	5.04%	36.64%	4665.0%
Depreciation, Depletion And Amortization		$607.0M
YoY Change		7.05%
Cash From Operating Activities	$771.0M	$1.084B	$1.003B
YoY Change	-23.13%	7.33%	4.37%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$1.513B	-$1.201B	-$787.0M
YoY Change	92.25%	46.11%	34.76%
Cash From Investing Activities	-$1.513B	-$1.201B	-$787.0M
YoY Change	92.25%	46.11%	34.76%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	1.014B	-91.00M	-291.0M
YoY Change	-448.45%	-20.87%	321.74%
NET CHANGE
Cash From Operating Activities	771.0M	1.084B	1.003B
Cash From Investing Activities	-1.513B	-1.201B	-787.0M
Cash From Financing Activities	1.014B	-91.00M	-291.0M
Net Change In Cash	272.0M	-208.0M	-75.00M
YoY Change	-462.67%	-384.93%	-124.35%
FREE CASH FLOW
Cash From Operating Activities	$771.0M	$1.084B	$1.003B
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2008	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	332900719	shares
CY2009Q4	us-gaap	Related Party Transaction Due From To Related Party RelatedPartyTransactionDueFromToRelatedParty	31000000	USD
CY2010Q4	us-gaap	Related Party Transaction Due From To Related Party RelatedPartyTransactionDueFromToRelatedParty	30000000	USD
CY2010Q4	ace	Statutory Dividends Available To Be Paid Without Approval StatutoryDividendsAvailableToBePaidWithoutApproval	850000000	USD
CY2010Q4	ace	Statutory Discounting Asbestos And Environmental Liabilities Impact On Statutory Capital And Surplus StatutoryDiscountingAsbestosAndEnvironmentalLiabilitiesImpactOnStatutoryCapitalAndSurplus	206000000	USD
CY2009Q4	ace	Statutory Discounting Asbestos And Environmental Liabilities Impact On Statutory Capital And Surplus StatutoryDiscountingAsbestosAndEnvironmentalLiabilitiesImpactOnStatutoryCapitalAndSurplus	215000000	USD
CY2008Q4	ace	Statutory Discounting Asbestos And Environmental Liabilities Impact On Statutory Capital And Surplus StatutoryDiscountingAsbestosAndEnvironmentalLiabilitiesImpactOnStatutoryCapitalAndSurplus	211000000	USD
CY2010Q4	us-gaap	Other Liabilities OtherLiabilities	8587000000	USD
CY2010Q4	ace	Other Assets Condensed OtherAssetsCondensed	8493000000	USD
CY2010Q4	ace	Parent Guarantor Ownership Percentage Subsidiary Issuer ParentGuarantorOwnershipPercentageSubsidiaryIssuer	1.00	pure
CY2009Q4	us-gaap	Other Liabilities OtherLiabilities	7827000000	USD
CY2009Q4	ace	Other Assets Condensed OtherAssetsCondensed	8553000000	USD
CY2010	ace	Policy Acquisition Costs And Administrative Expenses PolicyAcquisitionCostsAndAdministrativeExpenses	4195000000	USD
CY2009	ace	Policy Acquisition Costs And Administrative Expenses PolicyAcquisitionCostsAndAdministrativeExpenses	3941000000	USD
CY2008	ace	Policy Acquisition Costs And Administrative Expenses PolicyAcquisitionCostsAndAdministrativeExpenses	3872000000	USD
CY2010	ace	Payments To Acquire Available For Sale Securities Debt Condensed PaymentsToAcquireAvailableForSaleSecuritiesDebtCondensed	31256000000	USD
CY2010	ace	Proceeds From Sale Of Available For Sale Securites Debt Condensed ProceedsFromSaleOfAvailableForSaleSecuritesDebtCondensed	24279000000	USD
CY2010	us-gaap	Proceeds From Repayments Of Long Term Debt And Capital Securities ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities	199000000	USD
CY2010	ace	Proceeds From Repayments Of Short Term Borrowings ProceedsFromRepaymentsOfShortTermBorrowings	1141000000	USD
CY2009	ace	Payments To Acquire Available For Sale Securities Debt Condensed PaymentsToAcquireAvailableForSaleSecuritiesDebtCondensed	37260000000	USD
CY2009	ace	Proceeds From Sale Of Available For Sale Securites Debt Condensed ProceedsFromSaleOfAvailableForSaleSecuritesDebtCondensed	29654000000	USD
CY2009	us-gaap	Proceeds From Repayments Of Long Term Debt And Capital Securities ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities	500000000	USD
CY2009	ace	Proceeds From Repayments Of Short Term Borrowings ProceedsFromRepaymentsOfShortTermBorrowings	-466000000	USD
CY2008	ace	Payments To Acquire Available For Sale Securities Debt Condensed PaymentsToAcquireAvailableForSaleSecuritiesDebtCondensed	43506000000	USD
CY2008	ace	Proceeds From Sale Of Available For Sale Securites Debt Condensed ProceedsFromSaleOfAvailableForSaleSecuritesDebtCondensed	39427000000	USD
CY2008	us-gaap	Proceeds From Repayments Of Long Term Debt And Capital Securities ProceedsFromRepaymentsOfLongTermDebtAndCapitalSecurities	1245000000	USD
CY2008	ace	Proceeds From Repayments Of Short Term Borrowings ProceedsFromRepaymentsOfShortTermBorrowings	-89000000	USD
CY2010Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	3277000000	USD
CY2010Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	3233000000	USD
CY2010Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	3422000000	USD
CY2010Q1	us-gaap	Investment Income Net InvestmentIncomeNet	504000000	USD
CY2010Q2	us-gaap	Investment Income Net InvestmentIncomeNet	518000000	USD
CY2010Q3	us-gaap	Investment Income Net InvestmentIncomeNet	516000000	USD
CY2010Q1	ace	Net Realized Gains Losses NetRealizedGainsLosses	168000000	USD
CY2010Q2	ace	Net Realized Gains Losses NetRealizedGainsLosses	9000000	USD
CY2010Q3	ace	Net Realized Gains Losses NetRealizedGainsLosses	-50000000	USD
CY2010Q1	us-gaap	Revenues Revenues	3949000000	USD
CY2010Q2	us-gaap	Revenues Revenues	3760000000	USD
CY2010Q3	us-gaap	Revenues Revenues	3888000000	USD
CY2010Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1921000000	USD
CY2010Q2	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1800000000	USD
CY2010Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1887000000	USD
CY2010Q1	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	87000000	USD
CY2010Q2	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	87000000	USD
CY2010Q3	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	93000000	USD
CY2010Q1	us-gaap	Net Income Loss NetIncomeLoss	755000000	USD
CY2010Q3	us-gaap	Net Income Loss NetIncomeLoss	675000000	USD
CY2010Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.23	USD
CY2010Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.99	USD
CY2010Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.98	USD
CY2010Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.22	USD
CY2010Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.98	USD
CY2008	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	8417000000	USD
CY2008	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Net Investment Income SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome	1966000000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	8091000000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	8001000000	USD
CY2009Q3	us-gaap	Revenues Revenues	3681000000	USD
CY2009Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1816000000	USD
CY2009Q2	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1821000000	USD
CY2010Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.97	USD
CY2009Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.46	USD
CY2009Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	3194000000	USD
CY2009Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	3266000000	USD
CY2009Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	3393000000	USD
CY2009Q1	us-gaap	Investment Income Net InvestmentIncomeNet	502000000	USD
CY2009Q2	us-gaap	Investment Income Net InvestmentIncomeNet	506000000	USD
CY2009Q3	us-gaap	Investment Income Net InvestmentIncomeNet	511000000	USD
CY2009Q1	ace	Net Realized Gains Losses NetRealizedGainsLosses	-121000000	USD
CY2009Q2	ace	Net Realized Gains Losses NetRealizedGainsLosses	-225000000	USD
CY2009Q3	ace	Net Realized Gains Losses NetRealizedGainsLosses	-223000000	USD
CY2009Q1	us-gaap	Revenues Revenues	3575000000	USD
CY2009Q2	us-gaap	Revenues Revenues	3547000000	USD
CY2009Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1885000000	USD
CY2009Q1	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	99000000	USD
CY2009Q2	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	78000000	USD
CY2009Q3	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	79000000	USD
CY2009Q1	us-gaap	Net Income Loss NetIncomeLoss	567000000	USD
CY2009Q2	us-gaap	Net Income Loss NetIncomeLoss	535000000	USD
CY2009Q3	us-gaap	Net Income Loss NetIncomeLoss	494000000	USD
CY2009Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69	USD
CY2009Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.58	USD
CY2009Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.46	USD
CY2009Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.69	USD
CY2010Q2	us-gaap	Net Income Loss NetIncomeLoss	677000000	USD
CY2009Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.58	USD
CY2009Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.81	USD
CY2009Q4	us-gaap	Premiums Earned Net PremiumsEarnedNet	3387000000	USD
CY2009Q4	us-gaap	Investment Income Net InvestmentIncomeNet	512000000	USD
CY2009Q4	ace	Net Realized Gains Losses NetRealizedGainsLosses	373000000	USD
CY2009Q4	us-gaap	Revenues Revenues	4272000000	USD
CY2009Q4	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1900000000	USD
CY2009Q4	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	69000000	USD
CY2009Q4	us-gaap	Net Income Loss NetIncomeLoss	953000000	USD
CY2009Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.82	USD
CY2010Q4	us-gaap	Premiums Earned Net PremiumsEarnedNet	3572000000	USD
CY2010Q4	us-gaap	Investment Income Net InvestmentIncomeNet	532000000	USD
CY2010Q4	ace	Net Realized Gains Losses NetRealizedGainsLosses	305000000	USD
CY2010Q4	us-gaap	Revenues Revenues	4409000000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Earned Premiums SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums	12981000000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Earned Premiums SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums	12713000000	USD
CY2008	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Earned Premiums SupplementalInformationForPropertyCasualtyInsuranceUnderwritersEarnedPremiums	12742000000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Net Investment Income SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome	1996000000	USD
CY2010Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.94	USD
CY2010Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.92	USD
CY2010Q4	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	90000000	USD
CY2010Q4	us-gaap	Net Income Loss NetIncomeLoss	1001000000	USD
CY2010Q4	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	1971000000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	15780000000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	5792000000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	3516000000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Net Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmount	13504000000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	15415000000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	5943000000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	3768000000	USD
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Net Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmount	13240000000	USD
CY2008	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Gross Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentGrossAmount	16087000000	USD
CY2008	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Net Amount ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmount	13203000000	USD
CY2008	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Assumed From Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountAssumedFromOtherCompanies	3260000000	USD
CY2008	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Amount Ceded To Other Companies ReinsurancePremiumsForInsuranceCompaniesByProductSegmentAmountCededToOtherCompanies	6144000000	USD
CY2010	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Percentage Of Amount Assumed To Net ReinsurancePremiumsForInsuranceCompaniesByProductSegmentPercentageOfAmountAssumedToNet	0.26	pure
CY2009	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Percentage Of Amount Assumed To Net ReinsurancePremiumsForInsuranceCompaniesByProductSegmentPercentageOfAmountAssumedToNet	0.28	pure
CY2008	us-gaap	Reinsurance Premiums For Insurance Companies By Product Segment Percentage Of Amount Assumed To Net ReinsurancePremiumsForInsuranceCompaniesByProductSegmentPercentageOfAmountAssumedToNet	0.25	pure
CY2010Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Deferred Policy Acquisition Costs SupplementalInformationForPropertyCasualtyInsuranceUnderwritersDeferredPolicyAcquisitionCosts	1581000000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Net Investment Income SupplementalInformationForPropertyCasualtyInsuranceUnderwritersNetInvestmentIncome	1940000000	USD
CY2009Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Deferred Policy Acquisition Costs SupplementalInformationForPropertyCasualtyInsuranceUnderwritersDeferredPolicyAcquisitionCosts	1396000000	USD
CY2008Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Deferred Policy Acquisition Costs SupplementalInformationForPropertyCasualtyInsuranceUnderwritersDeferredPolicyAcquisitionCosts	1192000000	USD
CY2009Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Reserves For Unpaid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense	25038000000	USD
CY2010Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Reserves For Unpaid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense	25242000000	USD
CY2008Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Reserves For Unpaid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersReservesForUnpaidClaimsAndClaimsAdjustmentExpense	24241000000	USD
CY2010Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Unearned Premiums SupplementalInformationForPropertyCasualtyInsuranceUnderwritersUnearnedPremiums	6295000000	USD
CY2009Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Unearned Premiums SupplementalInformationForPropertyCasualtyInsuranceUnderwritersUnearnedPremiums	6034000000	USD
CY2008Q4	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Unearned Premiums SupplementalInformationForPropertyCasualtyInsuranceUnderwritersUnearnedPremiums	5924000000	USD
CY2010Q4	ace	Deferred Tax Liabilities Goodwill And Intangible Assets Value Of Business Acquired DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsValueOfBusinessAcquired	367000000	USD
CY2010Q4	ace	Deferred Tax Liabilities Unremitted Foreign Earnings DeferredTaxLiabilitiesUnremittedForeignEarnings	718000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	262000000	USD
CY2010Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	4233000000	USD
CY2010Q4	ace	Reinsurance Recoverable Losses And Loss Expenses ReinsuranceRecoverableLossesAndLossExpenses	12871000000	USD
CY2010	dei	Entity Registrant Name EntityRegistrantName	ACE LTD
CY2010	dei	Entity Central Index Key EntityCentralIndexKey	0000896159
CY2010	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2010	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2010	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2010	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2010	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2010Q2	dei	Entity Public Float EntityPublicFloat	17000000000	USD
CY2010	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2010
CY2010	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q4
CY2010	dei	Document Type DocumentType	10-K
CY2010	dei	Document Period End Date DocumentPeriodEndDate	2010-12-31
CY2010	dei	Amendment Flag AmendmentFlag	false
CY2010Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	334942852	shares
CY2010Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	9501000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Equity Securities AvailableForSaleSecuritiesEquitySecurities	692000000	USD
CY2010Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	1983000000	USD
CY2010Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	1692000000	USD
CY2010Q4	us-gaap	Investments Investments	51407000000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	772000000	USD
CY2010Q4	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	1495000000	USD
CY2010Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	521000000	USD
CY2010Q4	ace	Reinsurance Recoverable Future Policy Benefits ReinsuranceRecoverableFuturePolicyBenefits	281000000	USD
CY2010Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	1641000000	USD
CY2010Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	634000000	USD
CY2010Q4	ace	Goodwill And Intangibles GoodwillAndIntangibles	4664000000	USD
CY2010Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	1511000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	769000000	USD
CY2010Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	360000000	USD
CY2010Q4	us-gaap	Other Assets OtherAssets	2196000000	USD
CY2010Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Ibnr Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedIBNRClaims	37391000000	USD
CY2010Q4	us-gaap	Unearned Premiums UnearnedPremiums	6330000000	USD
CY2010Q4	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	3106000000	USD
CY2010Q4	us-gaap	Reinsurance Payable ReinsurancePayable	3282000000	USD
CY2009Q4	ace	Reinsurance Recoverable Losses And Loss Expenses ReinsuranceRecoverableLossesAndLossExpenses	13595000000	USD
CY2009Q4	ace	Reinsurance Recoverable Future Policy Benefits ReinsuranceRecoverableFuturePolicyBenefits	298000000	USD
CY2010Q4	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	1518000000	USD
CY2010Q4	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	292000000	USD
CY2010Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	2958000000	USD
CY2010Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	116000000	USD
CY2010Q4	us-gaap	Long Term Debt LongTermDebt	3358000000	USD
CY2010Q4	us-gaap	Common Stock Value CommonStockValue	10161000000	USD
CY2010Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5623000000	USD
CY2010Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	5926000000	USD
CY2010Q4	us-gaap	Deferred Compensation Equity DeferredCompensationEquity	-2000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1594000000	USD
CY2010Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	2000000	USD
CY2010Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	83355000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	36542000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost	38985000000	USD
CY2010Q4	us-gaap	Hybrid Instruments At Fair Value Net HybridInstrumentsAtFairValueNet	416000000	USD
CY2009Q4	us-gaap	Hybrid Instruments At Fair Value Net HybridInstrumentsAtFairValueNet	354000000	USD
CY2010Q4	ace	Available For Sale Securities Equity Securities Cost AvailableForSaleSecuritiesEquitySecuritiesCost	666000000	USD
CY2009Q4	ace	Available For Sale Securities Equity Securities Cost AvailableForSaleSecuritiesEquitySecuritiesCost	398000000	USD
CY2010Q4	ace	Investments In Affiliates Subsidiaries Associates And Joint Ventures At Cost InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesAtCost	357000000	USD
CY2009Q4	ace	Investments In Affiliates Subsidiaries Associates And Joint Ventures At Cost InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesAtCost	314000000	USD
CY2010Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	341094559	shares
CY2009Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	337841616	shares
CY2010Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	334942852	shares
CY2009Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	336524657	shares
CY2010Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	6151707	shares
CY2009Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1316959	shares
CY2009Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	3481000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Equity Securities AvailableForSaleSecuritiesEquitySecurities	467000000	USD
CY2009Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	1667000000	USD
CY2009Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	1375000000	USD
CY2009Q4	us-gaap	Investments Investments	46515000000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	669000000	USD
CY2009Q4	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	1544000000	USD
CY2009Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	502000000	USD
CY2009Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	3671000000	USD
CY2009Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	1445000000	USD
CY2009Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	748000000	USD
CY2009Q4	ace	Goodwill And Intangibles GoodwillAndIntangibles	3931000000	USD
CY2009Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	1521000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1154000000	USD
CY2009Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	433000000	USD
CY2009Q4	us-gaap	Other Assets OtherAssets	1954000000	USD
CY2009Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Ibnr Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedIBNRClaims	37783000000	USD
CY2009Q4	us-gaap	Unearned Premiums UnearnedPremiums	6067000000	USD
CY2009Q4	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	3008000000	USD
CY2009Q4	us-gaap	Reinsurance Payable ReinsurancePayable	3295000000	USD
CY2009Q4	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	1586000000	USD
CY2009Q4	us-gaap	Assets Assets	77980000000	USD
CY2009Q4	us-gaap	Common Stock Value CommonStockValue	10503000000	USD
CY2009Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	5526000000	USD
CY2009Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2818000000	USD
CY2009Q4	us-gaap	Payables To Broker Dealers And Clearing Organizations PayablesToBrokerDealersAndClearingOrganizations	154000000	USD
CY2009Q4	us-gaap	Accounts Payable And Accrued Liabilities Current And Noncurrent AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent	2349000000	USD
CY2009Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	111000000	USD
CY2009Q4	us-gaap	Long Term Debt LongTermDebt	3158000000	USD
CY2009Q4	us-gaap	Deferred Compensation Equity DeferredCompensationEquity	-2000000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	823000000	USD
CY2009Q4	us-gaap	Unearned Esop Shares UnearnedESOPShares	2000000	USD
CY2009Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	77980000000	USD
CY2010Q4	us-gaap	Assets Assets	83355000000	USD
CY2009Q4	us-gaap	Liabilities Liabilities	58313000000	USD
CY2010Q4	us-gaap	Liabilities Liabilities	60381000000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	19667000000	USD
CY2010Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	1300000000	USD
CY2009Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	161000000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	22974000000	USD
CY2010Q4	us-gaap	Policyholder Contract Deposits PolicyholderContractDeposits	421000000	USD
CY2009Q4	us-gaap	Policyholder Contract Deposits PolicyholderContractDeposits	332000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	37539000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	39525000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	9461000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	3561000000	USD
CY2010Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	309000000	USD
CY2009Q4	us-gaap	Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust	309000000	USD
CY2010Q4	us-gaap	Treasury Stock Value TreasuryStockValue	330000000	USD
CY2009Q4	us-gaap	Treasury Stock Value TreasuryStockValue	3000000	USD
CY2010Q4	us-gaap	Other Investments And Securities At Cost OtherInvestmentsAndSecuritiesAtCost	1511000000	USD
CY2009Q4	us-gaap	Other Investments And Securities At Cost OtherInvestmentsAndSecuritiesAtCost	1258000000	USD
CY2010	us-gaap	Premiums Written Net PremiumsWrittenNet	13708000000	USD
CY2010	ace	Change In Unearned Premium Net ChangeInUnearnedPremiumNet	204000000	USD
CY2010	us-gaap	Premiums Earned Net PremiumsEarnedNet	13504000000	USD
CY2010	us-gaap	Investment Income Net InvestmentIncomeNet	2070000000	USD
CY2010	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	128000000	USD
CY2010	ace	Portion Other Than Temporary Losses In Accumulated Other Comprehensive Income PortionOtherThanTemporaryLossesInAccumulatedOtherComprehensiveIncome	69000000	USD
CY2010	ace	Net Other Than Temporary Impairments Recognized In Net Income NetOtherThanTemporaryImpairmentsRecognizedInNetIncome	-59000000	USD
CY2010	ace	Net Realized Gains Losses Excluding Other Than Temporary Impairments NetRealizedGainsLossesExcludingOtherThanTemporaryImpairments	491000000	USD
CY2010	ace	Net Realized Gains Losses NetRealizedGainsLosses	432000000	USD
CY2010	us-gaap	Revenues Revenues	16006000000	USD
CY2010	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	7579000000	USD
CY2010	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	357000000	USD
CY2010	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	2337000000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	1858000000	USD
CY2010	us-gaap	Interest Expense InterestExpense	224000000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	16000000	USD
CY2010	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	12339000000	USD
CY2010	ace	Net Income Before Tax NetIncomeBeforeTax	3667000000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	559000000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	3108000000	USD
CY2010	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1526000000	USD
CY2010	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	632000000	USD
CY2010	ace	Other Comprehensive Income Loss Subtotal OtherComprehensiveIncomeLossSubtotal	894000000	USD
CY2010	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Before Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentBeforeTax	-11000000	USD
CY2010	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPeriodIncreaseDecrease	-7000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Before Tax Period Increase Decrease OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecrease	898000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	127000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	771000000	USD
CY2010	ace	Comprehensive Income Loss ComprehensiveIncomeLoss	3879000000	USD
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	9.15	USD
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	9.11	USD
CY2009	ace	Portion Other Than Temporary Losses In Accumulated Other Comprehensive Income PortionOtherThanTemporaryLossesInAccumulatedOtherComprehensiveIncome	302000000	USD
CY2009	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	699000000	USD
CY2009	us-gaap	Premiums Written Net PremiumsWrittenNet	13299000000	USD
CY2009	ace	Change In Unearned Premium Net ChangeInUnearnedPremiumNet	59000000	USD
CY2009	us-gaap	Premiums Earned Net PremiumsEarnedNet	13240000000	USD
CY2009	us-gaap	Investment Income Net InvestmentIncomeNet	2031000000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Before Tax Period Increase Decrease OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecrease	3307000000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	568000000	USD
CY2009	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	2739000000	USD
CY2009	ace	Comprehensive Income Loss ComprehensiveIncomeLoss	5288000000	USD
CY2009	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.57	USD
CY2009	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.55	USD
CY2008	us-gaap	Premiums Written Net PremiumsWrittenNet	13080000000	USD
CY2008	ace	Change In Unearned Premium Net ChangeInUnearnedPremiumNet	-123000000	USD
CY2008	us-gaap	Premiums Earned Net PremiumsEarnedNet	13203000000	USD
CY2008	us-gaap	Investment Income Net InvestmentIncomeNet	2062000000	USD
CY2008	us-gaap	Marketable Securities Realized Gain Loss Other Than Temporary Impairments Amount MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount	1064000000	USD
CY2009	ace	Net Other Than Temporary Impairments Recognized In Net Income NetOtherThanTemporaryImpairmentsRecognizedInNetIncome	-397000000	USD
CY2009	ace	Net Realized Gains Losses Excluding Other Than Temporary Impairments NetRealizedGainsLossesExcludingOtherThanTemporaryImpairments	201000000	USD
CY2009	ace	Net Realized Gains Losses NetRealizedGainsLosses	-196000000	USD
CY2009	us-gaap	Revenues Revenues	15075000000	USD
CY2009	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	7422000000	USD
CY2009	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	325000000	USD
CY2009	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	2130000000	USD
CY2009	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	1811000000	USD
CY2009	us-gaap	Interest Expense InterestExpense	225000000	USD
CY2009	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-85000000	USD
CY2009	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	11998000000	USD
CY2009	ace	Net Income Before Tax NetIncomeBeforeTax	3077000000	USD
CY2009	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	528000000	USD
CY2009	us-gaap	Net Income Loss NetIncomeLoss	2549000000	USD
CY2009	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	2712000000	USD
CY2009	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-75000000	USD
CY2009	ace	Other Comprehensive Income Loss Subtotal OtherComprehensiveIncomeLossSubtotal	2787000000	USD
CY2009	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPeriodIncreaseDecrease	568000000	USD
CY2009	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Before Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentBeforeTax	48000000	USD
CY2008	ace	Portion Other Than Temporary Losses In Accumulated Other Comprehensive Income PortionOtherThanTemporaryLossesInAccumulatedOtherComprehensiveIncome	0	USD
CY2008	ace	Net Other Than Temporary Impairments Recognized In Net Income NetOtherThanTemporaryImpairmentsRecognizedInNetIncome	-1064000000	USD
CY2008	ace	Net Realized Gains Losses Excluding Other Than Temporary Impairments NetRealizedGainsLossesExcludingOtherThanTemporaryImpairments	-569000000	USD
CY2008	ace	Net Realized Gains Losses NetRealizedGainsLosses	-1633000000	USD
CY2008	us-gaap	Revenues Revenues	13632000000	USD
CY2008	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	7603000000	USD
CY2008	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	399000000	USD
CY2008	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	2135000000	USD
CY2008	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	1737000000	USD
CY2008	us-gaap	Interest Expense InterestExpense	230000000	USD
CY2008	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	39000000	USD
CY2008	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	12065000000	USD
CY2008	ace	Net Income Before Tax NetIncomeBeforeTax	1567000000	USD
CY2008	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	370000000	USD
CY2008	us-gaap	Net Income Loss NetIncomeLoss	1197000000	USD
CY2008	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-3948000000	USD
CY2008	us-gaap	Other Comprehensive Income Reclassification Adjustment For Sale Of Securities Included In Net Income Before Tax OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeBeforeTax	-1189000000	USD
CY2008	ace	Other Comprehensive Income Loss Subtotal OtherComprehensiveIncomeLossSubtotal	-2759000000	USD
CY2008	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Before Tax Period Increase Decrease OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPeriodIncreaseDecrease	-590000000	USD
CY2008	us-gaap	Other Comprehensive Income Minimum Pension Liability Net Adjustment Before Tax OtherComprehensiveIncomeMinimumPensionLiabilityNetAdjustmentBeforeTax	-23000000	USD
CY2008	us-gaap	Other Comprehensive Income Loss Before Tax Period Increase Decrease OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecrease	-3326000000	USD
CY2008	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-647000000	USD
CY2008	us-gaap	Other Comprehensive Income Loss Net Of Tax Period Increase Decrease OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecrease	-2679000000	USD
CY2008	ace	Comprehensive Income Loss ComprehensiveIncomeLoss	-1482000000	USD
CY2008	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.52	USD
CY2008	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.50	USD
CY2010	ace	Effect Of Adoption Of Other Than Temporary Impairment Standard EffectOfAdoptionOfOtherThanTemporaryImpairmentStandard		USD
CY2008Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	14446000000	USD
CY2010	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	145000000	USD
CY2009	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	53000000	USD
CY2010	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-116000000	USD
CY2009	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	19000000	USD
CY2010	us-gaap	Increase Decrease In Loss And Loss Adjustment Expense Reserve IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	360000000	USD
CY2009	us-gaap	Increase Decrease In Loss And Loss Adjustment Expense Reserve IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	-298000000	USD
CY2010	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	262000000	USD
CY2009	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	102000000	USD
CY2010	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	48000000	USD
CY2009	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	67000000	USD
CY2010	ace	Increase Decrease In Insurance And Reinsurance Balances Payable IncreaseDecreaseInInsuranceAndReinsuranceBalancesPayable	-172000000	USD
CY2009	ace	Increase Decrease In Insurance And Reinsurance Balances Payable IncreaseDecreaseInInsuranceAndReinsuranceBalancesPayable	434000000	USD
CY2010	ace	Increase Decrease In Accounts Payable Accrued Liabilities Other Liabilities IncreaseDecreaseInAccountsPayableAccruedLiabilitiesOtherLiabilities	130000000	USD
CY2009	ace	Increase Decrease In Accounts Payable Accrued Liabilities Other Liabilities IncreaseDecreaseInAccountsPayableAccruedLiabilitiesOtherLiabilities	-206000000	USD
CY2010	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	10000000	USD
CY2009	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	13000000	USD
CY2010	ace	Increase Decrease In Insurance And Reinsurance Balances Receivable IncreaseDecreaseInInsuranceAndReinsuranceBalancesReceivable	50000000	USD
CY2009	ace	Increase Decrease In Insurance And Reinsurance Balances Receivable IncreaseDecreaseInInsuranceAndReinsuranceBalancesReceivable	-119000000	USD
CY2010	ace	Increase Decrease In Reinsurance Recoverable Losses And Loss Expenses IncreaseDecreaseInReinsuranceRecoverableLossesAndLossExpenses	626000000	USD
CY2009	ace	Increase Decrease In Reinsurance Recoverable Losses And Loss Expenses IncreaseDecreaseInReinsuranceRecoverableLossesAndLossExpenses	518000000	USD
CY2010	ace	Increase Decrease In Reinsurance Recoverable Future Policy Benefits IncreaseDecreaseInReinsuranceRecoverableFuturePolicyBenefits	49000000	USD
CY2009	ace	Increase Decrease In Reinsurance Recoverable Future Policy Benefits IncreaseDecreaseInReinsuranceRecoverableFuturePolicyBenefits	-51000000	USD
CY2010	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	193000000	USD
CY2009	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	309000000	USD
CY2010	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	13000000	USD
CY2009	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-24000000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-172000000	USD
CY2009	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	215000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3546000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3335000000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	29985000000	USD
CY2009	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	31789000000	USD
CY2010	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	616000000	USD
CY2009	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	472000000	USD
CY2010	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	794000000	USD
CY2009	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	354000000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	23096000000	USD
CY2009	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	23693000000	USD
CY2009	us-gaap	Proceeds From Sale Of Held To Maturity Securities ProceedsFromSaleOfHeldToMaturitySecurities	11000000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	774000000	USD
CY2010	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	434000000	USD
CY2009	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	1272000000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3660000000	USD
CY2009	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	3404000000	USD
CY2010	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	1353000000	USD
CY2009	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	514000000	USD
CY2010	us-gaap	Payments For Proceeds From Derivatives PaymentsForProceedsFromDerivatives	109000000	USD
CY2009	us-gaap	Payments For Proceeds From Derivatives PaymentsForProceedsFromDerivatives	92000000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	435000000	USD
CY2009	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	388000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	732000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-321000000	USD
CY2010	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	6000000	USD
CY2009	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	12000000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	103000000	USD
CY2009	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-198000000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	333000000	USD
CY2009	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-99000000	USD
CY2010	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	53000000	USD
CY2009	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	15000000	USD
CY2010	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	10000000	USD
CY2009	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	10000000	USD
CY2010	ace	Payments To Acquire To Be Announced Mortgage Backed Securities PaymentsToAcquireToBeAnnouncedMortgageBackedSecurities	1271000000	USD
CY2009	ace	Payments To Acquire To Be Announced Mortgage Backed Securities PaymentsToAcquireToBeAnnouncedMortgageBackedSecurities	5471000000	USD
CY2010	ace	Proceeds From Sales To Be Announced Mortgage Backed Securities ProceedsFromSalesToBeAnnouncedMortgageBackedSecurities	1183000000	USD
CY2009	ace	Proceeds From Sales To Be Announced Mortgage Backed Securities ProceedsFromSalesToBeAnnouncedMortgageBackedSecurities	5961000000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4181000000	USD
CY2009	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3224000000	USD
CY2010	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1139000000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	235000000	USD
CY2010	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	-1000000	USD
CY2009	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	8000000	USD
CY2010	us-gaap	Interest Paid Net InterestPaidNet	204000000	USD
CY2010	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	80000000	USD
CY2008	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	19000000	USD
CY2009	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	538000000	USD
CY2009	us-gaap	Interest Paid Net InterestPaidNet	228000000	USD
CY2008	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	403000000	USD
CY2008	us-gaap	Interest Paid Net InterestPaidNet	226000000	USD
CY2008	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	-1000000	USD
CY2008	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	141000000	USD
CY2008	us-gaap	Increase Decrease In Loss And Loss Adjustment Expense Reserve IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	-1300000000	USD
CY2008	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	-128000000	USD
CY2008	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	212000000	USD
CY2008	ace	Increase Decrease In Insurance And Reinsurance Balances Payable IncreaseDecreaseInInsuranceAndReinsuranceBalancesPayable	-26000000	USD
CY2008	ace	Increase Decrease In Accounts Payable Accrued Liabilities Other Liabilities IncreaseDecreaseInAccountsPayableAccruedLiabilitiesOtherLiabilities	638000000	USD
CY2008	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	46000000	USD
CY2008	ace	Increase Decrease In Insurance And Reinsurance Balances Receivable IncreaseDecreaseInInsuranceAndReinsuranceBalancesReceivable	-6000000	USD
CY2008	ace	Increase Decrease In Reinsurance Recoverable Losses And Loss Expenses IncreaseDecreaseInReinsuranceRecoverableLossesAndLossExpenses	-224000000	USD
CY2008	ace	Increase Decrease In Reinsurance Recoverable Future Policy Benefits IncreaseDecreaseInReinsuranceRecoverableFuturePolicyBenefits	-9000000	USD
CY2008	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	15000000	USD
CY2008	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	185000000	USD
CY2008	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	190000000	USD
CY2008	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4101000000	USD
CY2008	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4124000000	USD
CY2008	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	1164000000	USD
CY2008	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	2780000000	USD
CY2008	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	445000000	USD
CY2008	us-gaap	Payments For Proceeds From Derivatives PaymentsForProceedsFromDerivatives	-32000000	USD
CY2008	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	608000000	USD
CY2008	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2521000000	USD
CY2008	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	24537000000	USD
CY2008	ace	Payments To Acquire To Be Announced Mortgage Backed Securities PaymentsToAcquireToBeAnnouncedMortgageBackedSecurities	18969000000	USD
CY2008	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	366000000	USD
CY2008	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	971000000	USD
CY2008	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	21087000000	USD
CY2008	ace	Proceeds From Sales To Be Announced Mortgage Backed Securities ProceedsFromSalesToBeAnnouncedMortgageBackedSecurities	18340000000	USD
CY2008	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	362000000	USD
CY2008	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	97000000	USD
CY2008	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	10000000	USD
CY2008	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	12000000	USD
CY2008	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	314000000	USD
CY2008	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	66000000	USD
CY2008	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	357000000	USD
CY2007Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	510000000	USD
CY2008Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	867000000	USD
CY2008	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	-575000000	USD
CY2008	us-gaap	Payments Of Dividends Preferred Stock And Preference Stock PaymentsOfDividendsPreferredStockAndPreferenceStock	24000000	USD
CY2010	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	1300000000	USD
CY2010	ace	Repayments Of Long Term Debt Current RepaymentsOfLongTermDebtCurrent	159000000	USD
CY2009	ace	Repayments Of Long Term Debt Current RepaymentsOfLongTermDebtCurrent	466000000	USD
CY2008	ace	Repayments Of Long Term Debt Current RepaymentsOfLongTermDebtCurrent	355000000	USD
CY2008	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	266000000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	699000000	USD
CY2009	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	500000000	USD
CY2008	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1245000000	USD
CY2010	ace	Repayments Of Long Term Debt Non Current RepaymentsOfLongTermDebtNonCurrent	500000000	USD
CY2010Q4	ace	Period Assumed Reinsurance Premiums Earned Lower Range PeriodAssumedReinsurancePremiumsEarnedLowerRange	1	pure
CY2010Q4	ace	Period Assumed Reinsurance Premiums Earned Upper Range PeriodAssumedReinsurancePremiumsEarnedUpperRange	3	pure
CY2010Q4	ace	Deferred Advertising Costs Useful Life DeferredAdvertisingCostsUsefulLife	5	pure
CY2010Q4	us-gaap	Deferred Advertising Costs DeferredAdvertisingCosts	327000000	USD
CY2009	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	8.58	USD
CY2009Q4	us-gaap	Deferred Advertising Costs DeferredAdvertisingCosts	333000000	USD
CY2008Q4	us-gaap	Deferred Advertising Costs DeferredAdvertisingCosts	300000000	USD
CY2010	us-gaap	Other Deferred Cost Amortization Expense OtherDeferredCostAmortizationExpense	152000000	USD
CY2009	us-gaap	Other Deferred Cost Amortization Expense OtherDeferredCostAmortizationExpense	135000000	USD
CY2008	us-gaap	Other Deferred Cost Amortization Expense OtherDeferredCostAmortizationExpense	124000000	USD
CY2010Q4	ace	Partially Owned Investment Companies Ownership Percentage PartiallyOwnedInvestmentCompaniesOwnershipPercentage	0.03	pure
CY2010Q4	ace	Value Of Structured Settlements In Other Assets ValueOfStructuredSettlementsInOtherAssets	69000000	USD
CY2010	us-gaap	Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Or Loss BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss	175000000	USD
CY2010Q4	ace	Finite Lived Intangible Assets Useful Life Lower Range FiniteLivedIntangibleAssetsUsefulLifeLowerRange	4	pure
CY2010Q4	ace	Finite Lived Intangible Assets Useful Life Upper Range FiniteLivedIntangibleAssetsUsefulLifeUpperRange	20	pure
CY2010Q4	us-gaap	Deposit Assets DepositAssets	144000000	USD
CY2009Q4	us-gaap	Deposit Assets DepositAssets	55000000	USD
CY2010Q4	ace	Deposit Liabilities Reinsurance DepositLiabilitiesReinsurance	351000000	USD
CY2009Q4	ace	Deposit Liabilities Reinsurance DepositLiabilitiesReinsurance	281000000	USD
CY2010Q4	ace	Deposit Liabilities Insurance DepositLiabilitiesInsurance	70000000	USD
CY2009Q4	ace	Deposit Liabilities Insurance DepositLiabilitiesInsurance	51000000	USD
CY2010	ace	Value Of Reinsurance Business Assumed ValueOfReinsuranceBusinessAssumed	92000000	USD
CY2009	ace	Value Of Reinsurance Business Assumed ValueOfReinsuranceBusinessAssumed	111000000	USD
CY2010Q4	ace	Value Of Structured Settlements Liability ValueOfStructuredSettlementsLiability	654000000	USD
CY2010Q4	ace	Value Of Structured Settlements Receivable ValueOfStructuredSettlementsReceivable	585000000	USD
CY2010Q4	ace	Variable Annuity Reinsurance Treaty Period VariableAnnuityReinsuranceTreatyPeriod	2	pure
CY2010Q4	ace	Unrated Reinsurers Receivables Default Factor UnratedReinsurersReceivablesDefaultFactor	0.25	pure
CY2010Q4	ace	Securities Loaned Collateral Required Rate SecuritiesLoanedCollateralRequiredRate	1.02	pure
CY2010Q4	ace	Value Of Reinsurance Business Assumed Useful Life Lower Range ValueOfReinsuranceBusinessAssumedUsefulLifeLowerRange	5	pure
CY2010Q4	ace	Value Of Reinsurance Business Assumed Useful Life Upper Range ValueOfReinsuranceBusinessAssumedUsefulLifeUpperRange	40	pure
CY2010Q4	ace	Value Of Discounted Loss Reserves ValueOfDiscountedLossReserves	69000000	USD
CY2010Q4	ace	Liability For Future Policy Benefits Interest Rate Assumption Lower Range LiabilityForFuturePolicyBenefitsInterestRateAssumptionLowerRange	0.01	pure
CY2010Q4	ace	Liability For Future Policy Benefits Interest Rate Assumption Upper Range LiabilityForFuturePolicyBenefitsInterestRateAssumptionUpperRange	0.07	pure
CY2010	ace	Administrative Expenses Operating Results Claims Administrator AdministrativeExpensesOperatingResultsClaimsAdministrator	85000000	USD
CY2008	ace	Administrative Expenses Operating Results Claims Administrator AdministrativeExpensesOperatingResultsClaimsAdministrator	34000000	USD
CY2009	ace	Administrative Expenses Operating Results Claims Administrator AdministrativeExpensesOperatingResultsClaimsAdministrator	26000000	USD
CY2010Q4	ace	Cash And Cash Equivalents Maximum Maturity Period Deposits CashAndCashEquivalentsMaximumMaturityPeriodDeposits	3	pure
CY2010Q4	ace	Business Combination Pro Forma Information Percentage Used Calculate Acquisition Date Fair Value Ownership Interest BusinessCombinationProFormaInformationPercentageUsedCalculateAcquisitionDateFairValueOwnershipInterest	1.00	pure
CY2010Q4	us-gaap	Business Combination Consideration Transferred Other BusinessCombinationConsiderationTransferredOther	1000000000	USD
CY2010	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	8.78	USD
CY2010	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	8.74	USD
CY2009	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	8.56	USD
CY2010	ace	Net Unrealized Appreciation Included In Other Comprehensive Income NetUnrealizedAppreciationIncludedInOtherComprehensiveIncome	193000000	USD
CY2010Q4	ace	Net Unrealized Depreciation Included In Accumulated Other Comprehensive Income NetUnrealizedDepreciationIncludedInAccumulatedOtherComprehensiveIncome	99000000	USD
CY2009Q4	ace	Net Unrealized Depreciation Included In Accumulated Other Comprehensive Income NetUnrealizedDepreciationIncludedInAccumulatedOtherComprehensiveIncome	162000000	USD
CY2010Q4	ace	Fixed Maturities Total Number FixedMaturitiesTotalNumber	19998	pure
CY2010	ace	Company Assumed Recovery Rate CompanyAssumedRecoveryRate	0.25	pure
CY2010	ace	Moodys Historical Mean Recovery Rate MoodysHistoricalMeanRecoveryRate	0.4	pure
CY2009Q4	ace	Adoption Of Other Than Temporary Impairment Standard Net Accumulated Other Comprehensive Impact AdoptionOfOtherThanTemporaryImpairmentStandardNetAccumulatedOtherComprehensiveImpact	242000000	USD
CY2009Q4	ace	Adoption Of Other Than Temporary Impairment Standard Net Retained Earnings Impact AdoptionOfOtherThanTemporaryImpairmentStandardNetRetainedEarningsImpact	-242000000	USD
CY2009Q4	ace	Adoption Of Other Than Temporary Impairment Standard Pre Tax Accumulated Other Comprehensive Impact AdoptionOfOtherThanTemporaryImpairmentStandardPreTaxAccumulatedOtherComprehensiveImpact	305000000	USD
CY2009Q4	ace	Adoption Of Other Than Temporary Impairment Standard Pre Tax Retained Earnings Impact AdoptionOfOtherThanTemporaryImpairmentStandardPreTaxRetainedEarningsImpact	-305000000	USD
CY2009Q4	ace	Adoption Of Other Than Temporary Impairment Standard Deferred Tax Valuation Allowance Retained Earnings AdoptionOfOtherThanTemporaryImpairmentStandardDeferredTaxValuationAllowanceRetainedEarnings	-47000000	USD
CY2009Q4	ace	Adoption Of Other Than Temporary Impairment Standard Deferred Tax Valuation Allowance Deferred Tax Assets AdoptionOfOtherThanTemporaryImpairmentStandardDeferredTaxValuationAllowanceDeferredTaxAssets	-47000000	USD
CY2010Q4	ace	Portion Of Gross Unrealized Loss Represented By United States Treasury And Agency Obligations PortionOfGrossUnrealizedLossRepresentedByUnitedStatesTreasuryAndAgencyObligations	160000000	USD
CY2010	ace	Corporate Securities Credit Losses Recognized In Net Income CorporateSecuritiesCreditLossesRecognizedInNetIncome	14000000	USD
CY2009	ace	Corporate Securities Credit Losses Recognized In Net Income CorporateSecuritiesCreditLossesRecognizedInNetIncome	59000000	USD
CY2010Q4	ace	Fixed Maturities Largest Single Unrealized Loss FixedMaturitiesLargestSingleUnrealizedLoss	5000000	USD
CY2010Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	104000000	USD
CY2010Q4	us-gaap	Restricted Investments RestrictedInvestments	11909000000	USD
CY2010Q4	ace	Fixed Maturities In Unrealized Loss Position Number FixedMaturitiesInUnrealizedLossPositionNumber	4682	pure
CY2009	ace	Net Unrealized Appreciation Included In Other Comprehensive Income NetUnrealizedAppreciationIncludedInOtherComprehensiveIncome	196000000	USD
CY2010	ace	Mortgage Backed Securities Credit Losses Recognized In Net Income MortgageBackedSecuritiesCreditLossesRecognizedInNetIncome	32000000	USD
	ace	Mortgage Backed Securities Credit Losses Recognized In Net Income MortgageBackedSecuritiesCreditLossesRecognizedInNetIncome	56000000	USD
CY2009Q4	ace	Mortgage Backed Securities Percentage United States Government Agency Bonds MortgageBackedSecuritiesPercentageUnitedStatesGovernmentAgencyBonds	0.69	pure
CY2010Q4	ace	Limited Partnerships Number LimitedPartnershipsNumber	53	pure
CY2010Q4	us-gaap	Trading Securities Equity TradingSecuritiesEquity	28000000	USD
CY2009Q4	us-gaap	Trading Securities Equity TradingSecuritiesEquity	31000000	USD
CY2010Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	9000000	USD
CY2009Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	11000000	USD
CY2010Q4	ace	Transfer Residential Mortgage Backed Securities From Available For Sale To Held To Maturity TransferResidentialMortgageBackedSecuritiesFromAvailableForSaleToHeldToMaturity	6800000000	USD
CY2010Q4	ace	Mortgage Backed Securities Percentage United States Government Agency Bonds MortgageBackedSecuritiesPercentageUnitedStatesGovernmentAgencyBonds	0.79	pure
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1846000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	13094000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	10276000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	2818000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	8508000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1985000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	13444000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	10782000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	2812000000	USD
CY2010Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	8516000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	400000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	1983000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	2613000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	694000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount	3811000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	404000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	2010000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	2524000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	677000000	USD
CY2010Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	3846000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1354000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	3474000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	14457000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	9642000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	755000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	1096000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	108000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	82000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount	1440000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	1469000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	82000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	115000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	766000000	USD
CY2009Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	1129000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	9842000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	10058000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	3359000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	10067000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	14905000000	USD
CY2009Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1352000000	USD
CY2009Q4	ace	Available For Sale Securities Excluding Mortgage Backed Securities Amortized Cost AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesAmortizedCost	28927000000	USD
CY2009Q4	ace	Available For Sale Securities Excluding Mortgage Backed Securities Fair Value AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesFairValue	29683000000	USD
CY2010Q4	ace	Available For Sale Securities Excluding Mortgage Backed Securities Amortized Cost AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesAmortizedCost	28034000000	USD
CY2010Q4	ace	Available For Sale Securities Excluding Mortgage Backed Securities Fair Value AvailableForSaleSecuritiesExcludingMortgageBackedSecuritiesFairValue	29023000000	USD
CY2010Q4	ace	Held To Maturity Securities Excluding Mortgage Backed Securities Amortized Cost HeldToMaturitySecuritiesExcludingMortgageBackedSecuritiesAmortizedCost	5690000000	USD
CY2010Q4	ace	Held To Maturity Securities Excluding Mortgage Backed Securities Fair Value HeldToMaturitySecuritiesExcludingMortgageBackedSecuritiesFairValue	5615000000	USD
CY2009Q4	ace	Held To Maturity Securities Excluding Mortgage Backed Securities Amortized Cost HeldToMaturitySecuritiesExcludingMortgageBackedSecuritiesAmortizedCost	2041000000	USD
CY2009Q4	ace	Held To Maturity Securities Excluding Mortgage Backed Securities Fair Value HeldToMaturitySecuritiesExcludingMortgageBackedSecuritiesFairValue	2092000000	USD
CY2010	ace	Equity Securities Gross Unrealized Appreciation EquitySecuritiesGrossUnrealizedAppreciation	28000000	USD
CY2010	ace	Equity Securities Gross Unrealized Depreciation EquitySecuritiesGrossUnrealizedDepreciation	2000000	USD
CY2009	ace	Equity Securities Gross Unrealized Appreciation EquitySecuritiesGrossUnrealizedAppreciation	70000000	USD
CY2009	ace	Equity Securities Gross Unrealized Depreciation EquitySecuritiesGrossUnrealizedDepreciation	1000000	USD
CY2010	ace	Fixed Maturities Other Than Temporary Impairments Gross FixedMaturitiesOtherThanTemporaryImpairmentsGross	-115000000	USD
CY2010	ace	Fixed Maturities Other Than Temporary Impairments In Other Comprehensive Income Pre Tax FixedMaturitiesOtherThanTemporaryImpairmentsInOtherComprehensiveIncomePreTax	69000000	USD
CY2010	ace	Fixed Maturities Other Than Temporary Impairments Net FixedMaturitiesOtherThanTemporaryImpairmentsNet	-46000000	USD
CY2010	ace	Fixed Maturities Gross Realized Gains Excluding Other Than Temporary Impairments FixedMaturitiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	569000000	USD
CY2010	ace	Fixed Maturities Gross Realized Losses Excluding Other Than Temporary Impairments FixedMaturitiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	143000000	USD
CY2010	ace	Fixed Maturities Net Realized Gains Losses Total FixedMaturitiesNetRealizedGainsLossesTotal	380000000	USD
CY2010	ace	Equity Securities Gross Realized Gains Excluding Other Than Temporary Impairments EquitySecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	86000000	USD
CY2010	ace	Equity Securities Net Realized Gains Losses Total EquitySecuritiesNetRealizedGainsLossesTotal	84000000	USD
CY2010	ace	Other Investments Other Than Temporary Impairments OtherInvestmentsOtherThanTemporaryImpairments	-13000000	USD
CY2010	ace	Investment And Embedded Derivative Instruments Gains Losses InvestmentAndEmbeddedDerivativeInstrumentsGainsLosses	58000000	USD
CY2010	ace	Fair Value Adjustments On Insurance Derivative Gains Losses FairValueAdjustmentsOnInsuranceDerivativeGainsLosses	-28000000	USD
CY2010	ace	Standard And Poors Put Options And Futures Gains Losses StandardAndPoorsPutOptionsAndFuturesGainsLosses	-150000000	USD
CY2010	ace	Other Derivative Instruments Gains Losses OtherDerivativeInstrumentsGainsLosses	-19000000	USD
CY2010	ace	Other Realized Gains Losses OtherRealizedGainsLosses	174000000	USD
CY2009	ace	Fixed Maturities Other Than Temporary Impairments Gross FixedMaturitiesOtherThanTemporaryImpairmentsGross	-536000000	USD
CY2009	ace	Fixed Maturities Other Than Temporary Impairments In Other Comprehensive Income Pre Tax FixedMaturitiesOtherThanTemporaryImpairmentsInOtherComprehensiveIncomePreTax	302000000	USD
CY2009	ace	Fixed Maturities Other Than Temporary Impairments Net FixedMaturitiesOtherThanTemporaryImpairmentsNet	-234000000	USD
CY2009	ace	Fixed Maturities Gross Realized Gains Excluding Other Than Temporary Impairments FixedMaturitiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	591000000	USD
CY2009	ace	Fixed Maturities Gross Realized Losses Excluding Other Than Temporary Impairments FixedMaturitiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	398000000	USD
CY2009	ace	Fixed Maturities Net Realized Gains Losses Total FixedMaturitiesNetRealizedGainsLossesTotal	-41000000	USD
CY2009	ace	Equity Securities Other Than Temporary Impairments EquitySecuritiesOtherThanTemporaryImpairments	-26000000	USD
CY2009	ace	Equity Securities Gross Realized Gains Excluding Other Than Temporary Impairments EquitySecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	105000000	USD
CY2009	ace	Equity Securities Gross Realized Losses Excluding Other Than Temporary Impairments EquitySecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	224000000	USD
CY2009	ace	Equity Securities Net Realized Gains Losses Total EquitySecuritiesNetRealizedGainsLossesTotal	-145000000	USD
CY2009	ace	Other Investments Other Than Temporary Impairments OtherInvestmentsOtherThanTemporaryImpairments	-137000000	USD
CY2009	ace	Investment And Embedded Derivative Instruments Gains Losses InvestmentAndEmbeddedDerivativeInstrumentsGainsLosses	68000000	USD
CY2009	ace	Fair Value Adjustments On Insurance Derivative Gains Losses FairValueAdjustmentsOnInsuranceDerivativeGainsLosses	368000000	USD
CY2009	ace	Standard And Poors Put Options And Futures Gains Losses StandardAndPoorsPutOptionsAndFuturesGainsLosses	-363000000	USD
CY2010	ace	Change In Net Unrealized Appreciation Depreciation ChangeInNetUnrealizedAppreciationDepreciation	742000000	USD
CY2009	ace	Other Derivative Instruments Gains Losses OtherDerivativeInstrumentsGainsLosses	-93000000	USD
CY2009	ace	Other Realized Gains Losses OtherRealizedGainsLosses	168000000	USD
CY2010	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-54000000	USD
CY2009	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-21000000	USD
CY2010	ace	Equity Securities Gross Realized Losses Excluding Other Than Temporary Impairments EquitySecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	2000000	USD
CY2008	ace	Fixed Maturities Other Than Temporary Impairments Gross FixedMaturitiesOtherThanTemporaryImpairmentsGross	-760000000	USD
CY2008	ace	Fixed Maturities Other Than Temporary Impairments Net FixedMaturitiesOtherThanTemporaryImpairmentsNet	-760000000	USD
CY2008	ace	Fixed Maturities Gross Realized Gains Excluding Other Than Temporary Impairments FixedMaturitiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	654000000	USD
CY2008	ace	Fixed Maturities Gross Realized Losses Excluding Other Than Temporary Impairments FixedMaturitiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	740000000	USD
CY2008	ace	Fixed Maturities Net Realized Gains Losses Total FixedMaturitiesNetRealizedGainsLossesTotal	-846000000	USD
CY2008	ace	Equity Securities Other Than Temporary Impairments EquitySecuritiesOtherThanTemporaryImpairments	-248000000	USD
CY2008	ace	Equity Securities Gross Realized Gains Excluding Other Than Temporary Impairments EquitySecuritiesGrossRealizedGainsExcludingOtherThanTemporaryImpairments	140000000	USD
CY2008	ace	Equity Securities Gross Realized Losses Excluding Other Than Temporary Impairments EquitySecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments	241000000	USD
CY2008	ace	Equity Securities Net Realized Gains Losses Total EquitySecuritiesNetRealizedGainsLossesTotal	-349000000	USD
CY2008	ace	Other Investments Other Than Temporary Impairments OtherInvestmentsOtherThanTemporaryImpairments	-56000000	USD
CY2008	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	23000000	USD
CY2008	ace	Investment And Embedded Derivative Instruments Gains Losses InvestmentAndEmbeddedDerivativeInstrumentsGainsLosses	-3000000	USD
CY2008	ace	Fair Value Adjustments On Insurance Derivative Gains Losses FairValueAdjustmentsOnInsuranceDerivativeGainsLosses	-650000000	USD
CY2008	ace	Standard And Poors Put Options And Futures Gains Losses StandardAndPoorsPutOptionsAndFuturesGainsLosses	164000000	USD
CY2008	ace	Other Derivative Instruments Gains Losses OtherDerivativeInstrumentsGainsLosses	83000000	USD
CY2008	ace	Other Realized Gains Losses OtherRealizedGainsLosses	1000000	USD
CY2010	ace	Change In Net Unrealized Appreciation Depreciation Fixed Maturities Available For Sale ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesAvailableForSale	451000000	USD
CY2010	ace	Change In Net Unrealized Appreciation Depreciation Fixed Maturities Held To Maturity ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesHeldToMaturity	522000000	USD
CY2010	ace	Change In Net Unrealized Appreciation Depreciation Equities ChangeInNetUnrealizedAppreciationDepreciationEquities	-44000000	USD
CY2010	ace	Change In Net Unrealized Appreciation Depreciation Other Investments ChangeInNetUnrealizedAppreciationDepreciationOtherInvestments	-35000000	USD
CY2010	ace	Change In Net Unrealized Appreciation Depreciation Income Tax Expense Benefit ChangeInNetUnrealizedAppreciationDepreciationIncomeTaxExpenseBenefit	-152000000	USD
CY2010	ace	Net Realized Gains Losses And Change In Net Unrealized Appreciation Depreciation NetRealizedGainsLossesAndChangeInNetUnrealizedAppreciationDepreciation	1174000000	USD
CY2009	ace	Change In Net Unrealized Appreciation Depreciation Fixed Maturities Available For Sale ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesAvailableForSale	2723000000	USD
CY2009	ace	Change In Net Unrealized Appreciation Depreciation Fixed Maturities Held To Maturity ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesHeldToMaturity	-6000000	USD
CY2009	ace	Change In Net Unrealized Appreciation Depreciation Equities ChangeInNetUnrealizedAppreciationDepreciationEquities	213000000	USD
CY2009	ace	Change In Net Unrealized Appreciation Depreciation Other Investments ChangeInNetUnrealizedAppreciationDepreciationOtherInvestments	162000000	USD
CY2009	ace	Change In Net Unrealized Appreciation Depreciation Income Tax Expense Benefit ChangeInNetUnrealizedAppreciationDepreciationIncomeTaxExpenseBenefit	-481000000	USD
CY2009	ace	Change In Net Unrealized Appreciation Depreciation ChangeInNetUnrealizedAppreciationDepreciation	2611000000	USD
CY2009	ace	Net Realized Gains Losses And Change In Net Unrealized Appreciation Depreciation NetRealizedGainsLossesAndChangeInNetUnrealizedAppreciationDepreciation	2415000000	USD
CY2008	ace	Change In Net Unrealized Appreciation Depreciation Fixed Maturities Available For Sale ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesAvailableForSale	-2089000000	USD
CY2008	ace	Change In Net Unrealized Appreciation Depreciation Fixed Maturities Held To Maturity ChangeInNetUnrealizedAppreciationDepreciationFixedMaturitiesHeldToMaturity	-2000000	USD
CY2008	ace	Change In Net Unrealized Appreciation Depreciation Equities ChangeInNetUnrealizedAppreciationDepreciationEquities	-363000000	USD
CY2008	ace	Change In Net Unrealized Appreciation Depreciation Other Investments ChangeInNetUnrealizedAppreciationDepreciationOtherInvestments	-305000000	USD
CY2008	ace	Change In Net Unrealized Appreciation Depreciation Income Tax Expense Benefit ChangeInNetUnrealizedAppreciationDepreciationIncomeTaxExpenseBenefit	457000000	USD
CY2008	ace	Change In Net Unrealized Appreciation Depreciation ChangeInNetUnrealizedAppreciationDepreciation	-2302000000	USD
CY2008	ace	Net Realized Gains Losses And Change In Net Unrealized Appreciation Depreciation NetRealizedGainsLossesAndChangeInNetUnrealizedAppreciationDepreciation	-3935000000	USD
CY2009Q4	ace	Credit Losses Related To Securities Held CreditLossesRelatedToSecuritiesHeld	174000000	USD
CY2010	ace	Credit Losses Additions Where No Other Than Temporary Impairments Were Recorded CreditLossesAdditionsWhereNoOtherThanTemporaryImpairmentsWereRecorded	34000000	USD
CY2010	ace	Credit Losses Additions Where Other Than Temporary Impairments Were Recorded CreditLossesAdditionsWhereOtherThanTemporaryImpairmentsWereRecorded	12000000	USD
CY2010	ace	Credit Losses Reductions For Securities Sold CreditLossesReductionsForSecuritiesSold	-83000000	USD
CY2010Q4	ace	Credit Losses Related To Securities Held CreditLossesRelatedToSecuritiesHeld	137000000	USD
	ace	Credit Losses Additions Where No Other Than Temporary Impairments Were Recorded CreditLossesAdditionsWhereNoOtherThanTemporaryImpairmentsWereRecorded	104000000	USD
	ace	Credit Losses Additions Where Other Than Temporary Impairments Were Recorded CreditLossesAdditionsWhereOtherThanTemporaryImpairmentsWereRecorded	11000000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-512000000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-579000000	USD
CY2008	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-814000000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Amortization Of Deferred Policy Acquisition Costs SupplementalInformationForPropertyCasualtyInsuranceUnderwritersAmortizationOfDeferredPolicyAcquisitionCosts	2252000000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Amortization Of Deferred Policy Acquisition Costs SupplementalInformationForPropertyCasualtyInsuranceUnderwritersAmortizationOfDeferredPolicyAcquisitionCosts	2076000000	USD
CY2008	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Amortization Of Deferred Policy Acquisition Costs SupplementalInformationForPropertyCasualtyInsuranceUnderwritersAmortizationOfDeferredPolicyAcquisitionCosts	2087000000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Paid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense	7413000000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Paid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense	6948000000	USD
CY2008	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Paid Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPaidClaimsAndClaimsAdjustmentExpense	6327000000	USD
CY2010	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Premiums Written SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten	13166000000	USD
CY2009	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Premiums Written SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten	12735000000	USD
CY2008	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Premiums Written SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPremiumsWritten	12594000000	USD
	ace	Credit Losses Reductions Amounts Previously Recorded In Other Comprehensive Income But Subsequently Reflected In Net Income CreditLossesReductionsAmountsPreviouslyRecordedInOtherComprehensiveIncomeButSubsequentlyReflectedInNetIncome	-2000000	USD
	ace	Credit Losses Reductions For Securities Sold CreditLossesReductionsForSecuritiesSold	-69000000	USD
CY2009Q1	ace	Credit Losses Related To Securities Held CreditLossesRelatedToSecuritiesHeld	130000000	USD
CY2010Q4	ace	Investments In Affiliates Subsidiaries Associates And Joint Ventures Issued Share Capital InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesIssuedShareCapital	445000000	USD
CY2009Q4	ace	Investments In Affiliates Subsidiaries Associates And Joint Ventures Issued Share Capital InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesIssuedShareCapital	972200000	USD
CY2010	ace	Gross Investment Income GrossInvestmentIncome	2175000000	USD
CY2010	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	105000000	USD
CY2009	ace	Gross Investment Income GrossInvestmentIncome	2125000000	USD
CY2009	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	94000000	USD
CY2008	ace	Gross Investment Income GrossInvestmentIncome	2154000000	USD
CY2008	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	92000000	USD
CY2010Q4	ace	Restricted Assets Trust Funds RestrictedAssetsTrustFunds	8200000000	USD
CY2010Q4	ace	Restricted Assets Deposits With United States Regulatory Authorities RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities	2289000000	USD
CY2010Q4	ace	Restricted Assets Deposits With Non United States Regulatory Authorities RestrictedAssetsDepositsWithNonUnitedStatesRegulatoryAuthorities	1384000000	USD
CY2010Q4	ace	Restricted Assets Other Pledged Assets RestrictedAssetsOtherPledgedAssets	190000000	USD
CY2010Q4	us-gaap	Restricted Cash And Investments RestrictedCashAndInvestments	12063000000	USD
CY2009Q4	ace	Restricted Assets Trust Funds RestrictedAssetsTrustFunds	8402000000	USD
CY2009Q4	ace	Restricted Assets Deposits With United States Regulatory Authorities RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities	2475000000	USD
CY2009Q4	ace	Restricted Assets Deposits With Non United States Regulatory Authorities RestrictedAssetsDepositsWithNonUnitedStatesRegulatoryAuthorities	1199000000	USD
CY2009Q4	ace	Restricted Assets Other Pledged Assets RestrictedAssetsOtherPledgedAssets	245000000	USD
CY2009Q4	us-gaap	Restricted Cash And Investments RestrictedCashAndInvestments	12321000000	USD
CY2010	ace	Reinsurance Recoveries Losses And Loss Expenses Incurred ReinsuranceRecoveriesLossesAndLossExpensesIncurred	3300000000	USD
CY2009	ace	Reinsurance Recoveries Losses And Loss Expenses Incurred ReinsuranceRecoveriesLossesAndLossExpensesIncurred	3700000000	USD
CY2008	ace	Reinsurance Recoveries Losses And Loss Expenses Incurred ReinsuranceRecoveriesLossesAndLossExpensesIncurred	3300000000	USD
CY2010Q4	ace	Allowance For Reinsurance Recoverable AllowanceForReinsuranceRecoverable	530000000	USD
CY2009Q4	ace	Allowance For Reinsurance Recoverable AllowanceForReinsuranceRecoverable	582000000	USD
CY2010Q4	ace	Mortality Assumption Percentage Used MortalityAssumptionPercentageUsed	1.00	pure
CY2010Q4	ace	Reinsurance Largest Reinsurers Percentage Of Total Shareholders Equity ReinsuranceLargestReinsurersPercentageOfTotalShareholdersEquity	0.01	pure
CY2010	us-gaap	Direct Premiums Written DirectPremiumsWritten	15887000000	USD
CY2010	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	3624000000	USD
CY2010	us-gaap	Ceded Premiums Written CededPremiumsWritten	5803000000	USD
CY2010	ace	Direct Premiums Earned Net DirectPremiumsEarnedNet	15780000000	USD
CY2010	ace	Assumed Premiums Earned Net AssumedPremiumsEarnedNet	3516000000	USD
CY2010	ace	Ceded Premiums Earned Net CededPremiumsEarnedNet	5792000000	USD
CY2009	us-gaap	Direct Premiums Written DirectPremiumsWritten	15467000000	USD
CY2009	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	3697000000	USD
CY2009	us-gaap	Ceded Premiums Written CededPremiumsWritten	5865000000	USD
CY2009	ace	Direct Premiums Earned Net DirectPremiumsEarnedNet	15415000000	USD
CY2009	ace	Assumed Premiums Earned Net AssumedPremiumsEarnedNet	3768000000	USD
CY2009	ace	Ceded Premiums Earned Net CededPremiumsEarnedNet	5943000000	USD
CY2008	us-gaap	Direct Premiums Written DirectPremiumsWritten	15815000000	USD
CY2008	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	3427000000	USD
CY2008	us-gaap	Ceded Premiums Written CededPremiumsWritten	6162000000	USD
CY2008	ace	Direct Premiums Earned Net DirectPremiumsEarnedNet	16087000000	USD
CY2008	ace	Assumed Premiums Earned Net AssumedPremiumsEarnedNet	3260000000	USD
CY2008	ace	Ceded Premiums Earned Net CededPremiumsEarnedNet	6144000000	USD
CY2010Q4	ace	Reinsurance Recoverable Unpaid Losses And Loss Expenses Net ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet	12149000000	USD
CY2009Q4	ace	Reinsurance Recoverable Unpaid Losses And Loss Expenses Net ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet	12745000000	USD
CY2010Q4	ace	Reinsurance Recoverable Paid Losses And Loss Expenses Net ReinsuranceRecoverablePaidLossesAndLossExpensesNet	722000000	USD
CY2009Q4	ace	Reinsurance Recoverable Paid Losses And Loss Expenses Net ReinsuranceRecoverablePaidLossesAndLossExpensesNet	850000000	USD
CY2010	ace	Allowance For Reinsurance Recoverable Percentage AllowanceForReinsuranceRecoverablePercentage	0.04	pure
CY2010Q4	ace	Reinsurance Recoverable Losses And Loss Expenses Gross ReinsuranceRecoverableLossesAndLossExpensesGross	13401000000	USD
CY2010Q4	us-gaap	Goodwill Goodwill	4030000000	USD
CY2010Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	634000000	USD
CY2010Q4	ace	Goodwill Combined Insurance GoodwillCombinedInsurance	882000000	USD
CY2010Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	541000000	USD
CY2010Q4	us-gaap	Indefinite Lived Intangible Assets IndefiniteLivedIntangibleAssets	93000000	USD
CY2010	us-gaap	Finite Lived Intangible Assets Amortization Expense FiniteLivedIntangibleAssetsAmortizationExpense	9000000	USD
CY2009	us-gaap	Finite Lived Intangible Assets Amortization Expense FiniteLivedIntangibleAssetsAmortizationExpense	11000000	USD
CY2008	us-gaap	Finite Lived Intangible Assets Amortization Expense FiniteLivedIntangibleAssetsAmortizationExpense	12000000	USD
CY2010Q4	ace	Finite Lived Intangible Assets Future Amortization Expense Lower Range FiniteLivedIntangibleAssetsFutureAmortizationExpenseLowerRange	26000000	USD
CY2010Q4	ace	Finite Lived Intangible Assets Future Amortization Expense Upper Range FiniteLivedIntangibleAssetsFutureAmortizationExpenseUpperRange	37000000	USD
CY2008Q4	us-gaap	Goodwill Goodwill	3622000000	USD
CY2009	us-gaap	Goodwill Allocation Adjustment GoodwillAllocationAdjustment	-4000000	USD
CY1996Q4	ace	Dividend Retention Fund Balance DividendRetentionFundBalance	50000000	USD
CY2010Q4	ace	Century Statutory Surplus CenturyStatutorySurplus	25000000	USD
CY2010	us-gaap	Finite Lived Intangible Assets Future Amortization Expense FiniteLivedIntangibleAssetsFutureAmortizationExpense	308000000	USD
CY1996Q4	ace	Century Minimum Statutory Surplus Requied Under Restructuring Order CenturyMinimumStatutorySurplusRequiedUnderRestructuringOrder	25000000	USD
CY2010Q4	ace	Century Xol Reinsurance Coverage CenturyXolReinsuranceCoverage	800000000	USD
CY2010	ace	Goodwill Translation Adjustment GoodwillTranslationAdjustment	-16000000	USD
CY2009	ace	Goodwill Translation Adjustment GoodwillTranslationAdjustment	196000000	USD
CY2009Q4	us-gaap	Goodwill Goodwill	3814000000	USD
CY2010	us-gaap	Goodwill Allocation Adjustment GoodwillAllocationAdjustment	3000000	USD
CY2008	ace	Value Of Business Acquired Acquisition ValueOfBusinessAcquiredAcquisition	-1040000000	USD
CY2010	us-gaap	Amortization Of Value Of Business Acquired Voba AmortizationOfValueOfBusinessAcquiredVOBA	111000000	USD
CY2010	ace	Value Of Business Acquired Translation Adjustment ValueOfBusinessAcquiredTranslationAdjustment	3000000	USD
CY2008	us-gaap	Amortization Of Value Of Business Acquired Voba AmortizationOfValueOfBusinessAcquiredVOBA	84000000	USD
CY2008	ace	Value Of Business Acquired Translation Adjustment ValueOfBusinessAcquiredTranslationAdjustment	133000000	USD
CY2008Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	823000000	USD
CY2009	us-gaap	Amortization Of Value Of Business Acquired Voba AmortizationOfValueOfBusinessAcquiredVOBA	130000000	USD
CY2009	ace	Value Of Business Acquired Translation Adjustment ValueOfBusinessAcquiredTranslationAdjustment	-55000000	USD
CY2010	us-gaap	Future Amortization Expense Year One FutureAmortizationExpenseYearOne	93000000	USD
CY2010	us-gaap	Future Amortization Expense Year Two FutureAmortizationExpenseYearTwo	67000000	USD
CY2010	us-gaap	Future Amortization Expense Year Three FutureAmortizationExpenseYearThree	56000000	USD
CY2010	us-gaap	Future Amortization Expense Year Four FutureAmortizationExpenseYearFour	49000000	USD
CY2010	us-gaap	Future Amortization Expense Year Five FutureAmortizationExpenseYearFive	43000000	USD
CY2010Q4	ace	Century Aggregate Reinsurance Balances Ceded By Active Companies CenturyAggregateReinsuranceBalancesCededByActiveCompanies	758000000	USD
CY2009Q4	ace	Century Aggregate Reinsurance Balances Ceded By Active Companies CenturyAggregateReinsuranceBalancesCededByActiveCompanies	1200000000	USD
CY2010Q4	ace	Century Gross Reserves CenturyGrossReserves	2700000000	USD
CY2009Q4	ace	Century Gross Reserves CenturyGrossReserves	2800000000	USD
CY2010Q4	ace	Number Of Years Intercompany Liabilities Are Payable NumberOfYearsIntercompanyLiabilitiesArePayable	25	pure
CY2010Q4	ace	Century Remaining Nico Cover On Paid Loss Basis CenturyRemainingNicoCoverOnPaidLossBasis	927000000	USD
CY2009Q4	ace	Century Remaining Nico Cover On Paid Loss Basis CenturyRemainingNicoCoverOnPaidLossBasis	1140000000	USD
CY2010Q4	ace	Century Losses Ceded By Century And Other Amounts Owed To Century Relating To Active Companies CenturyLossesCededByCenturyAndOtherAmountsOwedToCenturyRelatingToActiveCompanies	453000000	USD
CY2009Q4	ace	Century Losses Ceded By Century And Other Amounts Owed To Century Relating To Active Companies CenturyLossesCededByCenturyAndOtherAmountsOwedToCenturyRelatingToActiveCompanies	629000000	USD
CY2010Q2	ace	Century Change In Surplus Due To Stock Transfer CenturyChangeInSurplusDueToStockTransfer	26000000	USD
CY2010Q2	ace	Century Statutory Surplus CenturyStatutorySurplus	51000000	USD
CY2010Q2	ace	Century Change In Assets Due To Stock Transfer CenturyChangeInAssetsDueToStockTransfer	169000000	USD
CY2010Q4	ace	Dividend Retention Fund Contributions DividendRetentionFundContributions	15000000	USD
CY2010Q4	ace	Century Remaining Limit Of Coverage Under Xol CenturyRemainingLimitOfCoverageUnderXol	410000000	USD
CY2009Q4	ace	Century Remaining Limit Of Coverage Under Xol CenturyRemainingLimitOfCoverageUnderXol	298000000	USD
CY2010Q4	ace	Century Undiscounted Losses Ceded Under Xol CenturyUndiscountedLossesCededUnderXol	390000000	USD
CY2010Q4	ace	Century Statutory Basis Losses Ceded To Xol CenturyStatutoryBasisLossesCededToXol	88000000	USD
CY2010Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	25242000000	USD
CY2009Q4	ace	Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Claims Net Of Reinsurance Recoverable Adjusted For Subsidiary Acquisition LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedClaimsNetOfReinsuranceRecoverableAdjustedForSubsidiaryAcquisition	24241000000	USD
CY2010Q4	ace	Century Xol Minimum Capital And Surplus CenturyXolMinimumCapitalAndSurplus	25000000	USD
CY2004Q4	ace	Century Contribution Surplus Note CenturyContributionSurplusNote	100000000	USD
CY2008Q4	ace	Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Claims Net Of Reinsurance Recoverable Adjusted For Subsidiary Acquisition LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedClaimsNetOfReinsuranceRecoverableAdjustedForSubsidiaryAcquisition	23945000000	USD
CY2008Q4	ace	Loss Reserve Impact Subsidiary Acquistion LossReserveImpactSubsidiaryAcquistion	353000000	USD
CY1996Q4	ace	Brandywine Contractual Obligations Assumed BrandywineContractualObligationsAssumed	2	pure
CY1996Q4	ace	Number Of Corporations Created From Restructuring NumberOfCorporationsCreatedFromRestructuring	2	pure
CY1996Q4	ace	Dividend Retention Fund Minimum Balance DividendRetentionFundMinimumBalance	50000000	USD
CY2009Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	25038000000	USD
CY2010Q4	ace	Loss Reserve Impact Subsidiary Acquistion LossReserveImpactSubsidiaryAcquistion	145000000	USD
CY2010Q4	ace	Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Claims Net Of Reinsurance Recoverable Adjusted For Subsidiary Acquisition LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedClaimsNetOfReinsuranceRecoverableAdjustedForSubsidiaryAcquisition	25183000000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	8091000000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-512000000	USD
CY2009Q4	ace	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther	323000000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	6948000000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	4455000000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	2493000000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	7422000000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	7579000000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	2689000000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	4724000000	USD
CY2010	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	7413000000	USD
CY2010Q4	ace	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther	-107000000	USD
CY2010Q4	us-gaap	Liability For Asbestos And Environmental Claims Gross LiabilityForAsbestosAndEnvironmentalClaimsGross	2335000000	USD
CY2009Q4	us-gaap	Liability For Asbestos And Environmental Claims Net LiabilityForAsbestosAndEnvironmentalClaimsNet	1357000000	USD
CY2008Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	24241000000	USD
CY2007Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	23592000000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-579000000	USD
CY2009	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	8001000000	USD
CY2008	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	8417000000	USD
CY2008	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsPriorYears	-814000000	USD
CY2008	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims	7603000000	USD
CY2008	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	2699000000	USD
CY2008	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	3628000000	USD
CY2008	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaid	6327000000	USD
CY2008Q4	ace	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther	-980000000	USD
CY2007Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Ibnr Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedIBNRClaims	37112000000	USD
CY2008Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Reported And Incurred But Not Reported Ibnr Claims LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseReportedAndIncurredButNotReportedIBNRClaims	37176000000	USD
CY2007Q4	ace	Reinsurance Recoverable Unpaid Losses And Loss Expenses Net ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet	13520000000	USD
CY2008Q4	ace	Reinsurance Recoverable Unpaid Losses And Loss Expenses Net ReinsuranceRecoverableUnpaidLossesAndLossExpensesNet	12935000000	USD
CY2009Q4	us-gaap	Liability For Asbestos And Environmental Claims Gross LiabilityForAsbestosAndEnvironmentalClaimsGross	2475000000	USD
CY2010	us-gaap	Liability For Asbestos And Environmental Claims Gross Incurred Loss LiabilityForAsbestosAndEnvironmentalClaimsGrossIncurredLoss	257000000	USD
CY2010	us-gaap	Liability For Asbestos And Environmental Claims Gross Claims Paid LiabilityForAsbestosAndEnvironmentalClaimsGrossClaimsPaid	-397000000	USD
CY2010	us-gaap	Liability For Asbestos And Environmental Claims Net Incurred Loss LiabilityForAsbestosAndEnvironmentalClaimsNetIncurredLoss	107000000	USD
CY2010	us-gaap	Liability For Asbestos And Environmental Claims Net Claims Paid LiabilityForAsbestosAndEnvironmentalClaimsNetClaimsPaid	-187000000	USD
CY2010	ace	Liability For Asbestos And Environmental Claims Net Foreign Exchange Revaluation LiabilityForAsbestosAndEnvironmentalClaimsNetForeignExchangeRevaluation	-1000000	USD
CY2010Q4	us-gaap	Liability For Asbestos And Environmental Claims Net LiabilityForAsbestosAndEnvironmentalClaimsNet	1276000000	USD
CY2010Q4	ace	Operating Loss Carry Forward United States Capital Loss OperatingLossCarryForwardUnitedStatesCapitalLoss	131000000	USD
CY2010Q4	ace	Unrecognized Tax Benefits Uncertain Timing UnrecognizedTaxBenefitsUncertainTiming	1000000	USD
CY2009Q4	ace	Unrecognized Tax Benefits Uncertain Timing UnrecognizedTaxBenefitsUncertainTiming	1000000	USD
CY2010Q4	ace	Operating Loss Carry Forward United States Net Operating Loss OperatingLossCarryForwardUnitedStatesNetOperatingLoss	30000000	USD
CY2010Q4	ace	Operating Loss Carry Forward Foreign Tax Credit OperatingLossCarryForwardForeignTaxCredit	105000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	21000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	138000000	USD
CY2010Q4	ace	Unrecognized Tax Benefits Interest Accruals UnrecognizedTaxBenefitsInterestAccruals	19000000	USD
CY2009Q4	ace	Unrecognized Tax Benefits Interest Accruals UnrecognizedTaxBenefitsInterestAccruals	20000000	USD
CY2010Q4	ace	Number Swiss Operating Subsidiaries In Zurich NumberSwissOperatingSubsidiariesInZurich	2	pure
CY2010Q4	ace	Unrecognized Tax Benefit Period Of Change UnrecognizedTaxBenefitPeriodOfChange	12	pure
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	443000000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	116000000	USD
CY2009	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	547000000	USD
CY2009	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-19000000	USD
CY2008	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	511000000	USD
CY2008	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-141000000	USD
CY2010	ace	Income Tax Expense Benefit At Weighted Average Rate IncomeTaxExpenseBenefitAtWeightedAverageRate	614000000	USD
CY2010	ace	Income Tax Reconciliation Non Taxable Acquisition Gain IncomeTaxReconciliationNonTaxableAcquisitionGain	61000000	USD
CY2010	ace	Income Tax Reconciliation Net Withholding Taxes IncomeTaxReconciliationNetWithholdingTaxes	15000000	USD
CY2010	ace	Income Tax Reconciliation Change In Valuation Allowance IncomeTaxReconciliationChangeInValuationAllowance	-3000000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	14000000	USD
CY2009	ace	Income Tax Expense Benefit At Weighted Average Rate IncomeTaxExpenseBenefitAtWeightedAverageRate	560000000	USD
CY2009	ace	Income Tax Reconciliation Net Withholding Taxes IncomeTaxReconciliationNetWithholdingTaxes	14000000	USD
CY2009	ace	Income Tax Reconciliation Change In Valuation Allowance IncomeTaxReconciliationChangeInValuationAllowance	-48000000	USD
CY2009	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	27000000	USD
CY2008	ace	Income Tax Expense Benefit At Weighted Average Rate IncomeTaxExpenseBenefitAtWeightedAverageRate	353000000	USD
CY2008	ace	Income Tax Reconciliation Net Withholding Taxes IncomeTaxReconciliationNetWithholdingTaxes	16000000	USD
CY2008	ace	Income Tax Reconciliation Change In Valuation Allowance IncomeTaxReconciliationChangeInValuationAllowance	1000000	USD
CY2008	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	25000000	USD
CY2010	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	20000000	USD
CY2009	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	25000000	USD
CY2008	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	25000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	852000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	87000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	952000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	51000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	132000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	57000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	114000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2247000000	USD
CY2010Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1447000000	USD
CY2010Q4	ace	Deferred Tax Liabilities Deferred Policy Acqusition Costs DeferredTaxLiabilitiesDeferredPolicyAcqusitionCosts	100000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	877000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	83000000	USD
CY2010Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	31000000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Unrealized Currency Losses DeferredTaxAssetsUnrealizedCurrencyLosses	2000000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	155000000	USD
CY2010Q4	ace	Other Investments Limited Partnerships And Partially Owned Investment Companies Funding Commitments OtherInvestmentsLimitedPartnershipsAndPartiallyOwnedInvestmentCompaniesFundingCommitments	753000000	USD
CY2010Q4	ace	Other Investments Limited Partnerships And Partially Owned Investment Companies Carrying Value OtherInvestmentsLimitedPartnershipsAndPartiallyOwnedInvestmentCompaniesCarryingValue	1141000000	USD
CY2010Q4	ace	Concentration Risk Percentage Marsh ConcentrationRiskPercentageMarsh	0.12	pure
CY2010Q4	ace	Concentration Risk Percentage Aon ConcentrationRiskPercentageAon	0.1	pure
CY2010Q4	ace	Settlement New York Workers Compensation Board SettlementNewYorkWorkersCompensationBoard	70000000	USD
CY2010Q4	ace	Line Of Credit Facility Letters Of Credit Issued LineOfCreditFacilityLettersOfCreditIssued	70000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	855000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Trading Securities DeferredTaxAssetsUnrealizedLossesOnTradingSecurities	35000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	145000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Capital Loss Carryforwards DeferredTaxAssetsCapitalLossCarryforwards	102000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Other DeferredTaxAssetsTaxDeferredExpenseOther	146000000	USD
CY2009Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	2243000000	USD
CY2009Q4	ace	Deferred Tax Liabilities Deferred Policy Acqusition Costs DeferredTaxLiabilitiesDeferredPolicyAcqusitionCosts	73000000	USD
CY2009Q4	ace	Deferred Tax Liabilities Goodwill And Intangible Assets Value Of Business Acquired DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsValueOfBusinessAcquired	188000000	USD
CY2009Q4	ace	Deferred Tax Liabilities Unremitted Foreign Earnings DeferredTaxLiabilitiesUnremittedForeignEarnings	657000000	USD
CY2009Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	110000000	USD
CY2009Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1055000000	USD
CY2009Q4	us-gaap	Valuation Allowance Amount ValuationAllowanceAmount	34000000	USD
CY2009Q4	us-gaap	Deferred Tax Liabilities Unrealized Currency Transaction Gains DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains	27000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-17000000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	139000000	USD
CY2008Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	150000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4000000	USD
CY2009Q2	ace	Settlement Sheet Metal Workers National Pension Fund And Alaska Ironworkers Pension Trust SettlementSheetMetalWorkersNationalPensionFundAndAlaskaIronworkersPensionTrust	1950000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	54000000	USD
CY2010Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	500000000	USD
CY2010Q4	ace	Concentration Risk Percentage Not Reached By Others ConcentrationRiskPercentageNotReachedByOthers	0.1	pure
CY2010Q4	ace	Line Of Credit Facility Borrowing Against Short Term Debt LineOfCreditFacilityBorrowingAgainstShortTermDebt	300000000	USD
CY2010	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	83000000	USD
CY2009	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	84000000	USD
CY2008	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	77000000	USD
CY2010	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	-139000000	USD
CY2009	us-gaap	Derivative Instruments Gain Loss Recognized In Income Net DerivativeInstrumentsGainLossRecognizedInIncomeNet	-20000000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	75000000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	65000000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	45000000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	38000000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	120000000	USD
CY2010Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	397000000	USD
CY2003Q4	ace	Redeemable Preferred Stock Additional Shares Issues RedeemablePreferredStockAdditionalSharesIssues	3000000	shares
CY2003Q4	us-gaap	Redeemable Preferred Stock Shares Issued RedeemablePreferredStockSharesIssued	20000000	shares
CY2003Q4	us-gaap	Redeemable Preferred Stock Redemption Price Per Share RedeemablePreferredStockRedemptionPricePerShare	25	USD
	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	575000000	USD
CY2003Q4	ace	Preferred Stock Dividend Rate Percentage PreferredStockDividendRatePercentage	0.078	pure
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.30	USD
CY2009	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.19	USD
CY2008Q3	ace	Common Stock Par Or Stated Value Per Share Pre Continuation CommonStockParOrStatedValuePerSharePreContinuation	0.041666667	USD
CY2010Q4	ace	Common Stock Shares Authorized Debt CommonStockSharesAuthorizedDebt	33000000	shares
CY2010Q4	ace	Common Stock Shares Authorized General CommonStockSharesAuthorizedGeneral	140000000	shares
CY2010Q4	ace	Common Stock Shares Authorized Employee Plans CommonStockSharesAuthorizedEmployeePlans	27148782	shares
CY2010Q4	ace	Repurchase Of Equity Authorized Value Current RepurchaseOfEquityAuthorizedValueCurrent	600000000	USD
CY2008	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.09	USD
CY2010	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	4926082	shares
CY2010	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	303000000	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	184000000	USD
CY2010Q4	ace	Common Stock Votes Per Share CommonStockVotesPerShare	1	pure
CY2010Q4	ace	Common Stock Maximum Ownership Percentage For Voting CommonStockMaximumOwnershipPercentageForVoting	0.1	pure
CY2008Q4	ace	Common Stock Par Value Distribution CommonStockParValueDistribution	0.60	CHF
CY2008	us-gaap	Dividends Preferred Stock Cash DividendsPreferredStockCash	24000000	USD
CY2007Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	329704531	shares
CY2008	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	3140194	shares
CY2008	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	2365401	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	984943	shares
CY2010	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2268000	shares
CY2009	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2000000	shares
CY2009	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	168720	shares
CY2010Q4	ace	Common Stock Shares Redeemed From Employee Trust Shares CommonStockSharesRedeemedFromEmployeeTrustShares		shares
CY2008Q4	ace	Common Stock Shares Redeemed From Employee Trust Shares CommonStockSharesRedeemedFromEmployeeTrustShares	8250	shares
CY2007Q4	us-gaap	Common Stock Shares Held In Employee Trust Shares CommonStockSharesHeldInEmployeeTrustShares	117231	shares
CY2010Q4	us-gaap	Common Stock Shares Held In Employee Trust Shares CommonStockSharesHeldInEmployeeTrustShares	101481	shares
CY2008Q4	us-gaap	Common Stock Shares Held In Employee Trust Shares CommonStockSharesHeldInEmployeeTrustShares	108981	shares
CY2009Q4	ace	Common Stock Shares Redeemed From Employee Trust Shares CommonStockSharesRedeemedFromEmployeeTrustShares	7500	shares
CY2009Q4	us-gaap	Common Stock Shares Held In Employee Trust Shares CommonStockSharesHeldInEmployeeTrustShares	101481	shares
CY2010Q4	ace	Stock Issued During Period Shares Employee Stock Purchase Plans Not Out Of Treasury StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansNotOutOfTreasury		shares
CY2009Q4	ace	Stock Issued During Period Shares Employee Stock Purchase Plans Not Out Of Treasury StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansNotOutOfTreasury	259395	shares
CY2008Q4	ace	Stock Issued During Period Shares Employee Stock Purchase Plans Not Out Of Treasury StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansNotOutOfTreasury	203375	shares
CY2008Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	335413501	shares
CY2008Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	333645471	shares
CY2008Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	1768030	shares
CY2010	ace	Share Based Compensation Arrangement By Share Based Payment Award Options Vesting Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestingPeriod	3	pure
CY2010	ace	Share Based Compensation Arrangement By Share Based Payment Award Options Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsTerm	10	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm	5.7	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Remaining Contractual Term ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm	4.3	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableIntrinsicValue	124000000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	12.09	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	12.95	USD
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	17.6	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	22000000	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	12000000	USD
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	54000000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	53000000	USD
CY2010	ace	Share Based Compensation Arrangement Restricted Stock Awards Vesting Period ShareBasedCompensationArrangementRestrictedStockAwardsVestingPeriod	4	pure
CY2010Q4	ace	Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Grants In Period Outside Directors ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodOutsideDirectors	36248	shares
CY2009Q4	ace	Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Grants In Period Outside Directors ShareBasedCompensationArrangementByShareBasedPaymentAwardRestrictedStockGrantsInPeriodOutsideDirectors	38154	shares
CY2010Q4	ace	Restricted Stock Units Issued To Officers During Period Shares Restricted Stock Award RestrictedStockUnitsIssuedToOfficersDuringPeriodSharesRestrictedStockAward	326091	shares
CY2009Q4	ace	Restricted Stock Units Issued To Officers During Period Shares Restricted Stock Award RestrictedStockUnitsIssuedToOfficersDuringPeriodSharesRestrictedStockAward	333104	shares
CY2008Q4	ace	Restricted Stock Units Issued To Officers During Period Shares Restricted Stock Award RestrictedStockUnitsIssuedToOfficersDuringPeriodSharesRestrictedStockAward	223588	shares
CY2010Q4	ace	Share Based Compensation Officers Restricted Stock Units Weighted Average Grant Date Fair Value ShareBasedCompensationOfficersRestrictedStockUnitsWeightedAverageGrantDateFairValue	50.36	USD
CY2009Q4	ace	Share Based Compensation Officers Restricted Stock Units Weighted Average Grant Date Fair Value ShareBasedCompensationOfficersRestrictedStockUnitsWeightedAverageGrantDateFairValue	38.75	USD
CY2008Q4	ace	Share Based Compensation Officers Restricted Stock Units Weighted Average Grant Date Fair Value ShareBasedCompensationOfficersRestrictedStockUnitsWeightedAverageGrantDateFairValue	59.93	USD
CY2010Q4	ace	Restricted Stock Units Officers Restricted Stock Award Number Unvested RestrictedStockUnitsOfficersRestrictedStockAwardNumberUnvested	636758	shares
CY2010Q4	ace	Share Based Compensation Cash Received From Employee Stock Purchase Plan Share Purchase ShareBasedCompensationCashReceivedFromEmployeeStockPurchasePlanSharePurchase	10400000	USD
CY2008Q4	ace	Restricted Stock Units Deferred Vesting Period RestrictedStockUnitsDeferredVestingPeriod	1	pure
CY2008Q4	ace	Restricted Stock Units Deferred Restricted Stock Awards Issued RestrictedStockUnitsDeferredRestrictedStockAwardsIssued	40362	shares
CY2010Q4	ace	Restricted Stock Units Deferred RestrictedStockUnitsDeferred	230451	shares
CY2010Q4	ace	Employee Stock Purchase Plan Percentage Of Purchase Price EmployeeStockPurchasePlanPercentageOfPurchasePrice	0.85	pure
CY2010Q4	ace	Employee Stock Purchase Plan Salary Percentage Limitation EmployeeStockPurchasePlanSalaryPercentageLimitation	0.1	pure
CY2010Q4	ace	Employee Stock Purchase Plan Number Of Subscription Periods EmployeeStockPurchasePlanNumberOfSubscriptionPeriods	2	pure
CY2008	ace	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRate	0.075	pure
CY2009	ace	Employee Stock Ownership Plan Options And Employee Stock Purchase Plan Compensation Expense EmployeeStockOwnershipPlanOptionsAndEmployeeStockPurchasePlanCompensationExpense	27000000	USD
CY2009Q4	ace	Share Based Compensation Cash Received From Employee Stock Purchase Plan Share Purchase ShareBasedCompensationCashReceivedFromEmployeeStockPurchasePlanSharePurchase	10600000	USD
CY2008Q4	ace	Share Based Compensation Cash Received From Employee Stock Purchase Plan Share Purchase ShareBasedCompensationCashReceivedFromEmployeeStockPurchasePlanSharePurchase	10100000	USD
CY2008	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	203375	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	19000000	shares
CY2010Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	30600000	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	12525434	shares
CY2010Q4	ace	Share Based Compensation Employee Stock Purchase Plan Share Authorization ShareBasedCompensationEmployeeStockPurchasePlanShareAuthorization	3000000	shares
CY2010Q4	ace	Share Based Compensation Employee Stock Purchase Plan Shares Available ShareBasedCompensationEmployeeStockPurchasePlanSharesAvailable	489358	shares
CY2010	ace	Employee Stock Ownership Plan Options And Employee Stock Purchase Plan Compensation Expense EmployeeStockOwnershipPlanOptionsAndEmployeeStockPurchasePlanCompensationExpense	28000000	USD
CY2010	ace	Employee Stock Ownership Plan Options And Employee Stock Purchase Plan Compensation Expense Net Of Tax EmployeeStockOwnershipPlanOptionsAndEmployeeStockPurchasePlanCompensationExpenseNetOfTax	25000000	USD
CY2009	ace	Employee Stock Ownership Plan Options And Employee Stock Purchase Plan Compensation Expense Net Of Tax EmployeeStockOwnershipPlanOptionsAndEmployeeStockPurchasePlanCompensationExpenseNetOfTax	25000000	USD
CY2008	ace	Employee Stock Ownership Plan Options And Employee Stock Purchase Plan Compensation Expense EmployeeStockOwnershipPlanOptionsAndEmployeeStockPurchasePlanCompensationExpense	24000000	USD
CY2008	ace	Employee Stock Ownership Plan Options And Employee Stock Purchase Plan Compensation Expense Net Of Tax EmployeeStockOwnershipPlanOptionsAndEmployeeStockPurchasePlanCompensationExpenseNetOfTax	22000000	USD
CY2010	us-gaap	Restricted Stock Expense RestrictedStockExpense	111000000	USD
CY2010	ace	Restricted Stock Expense Net Of Tax RestrictedStockExpenseNetOfTax	72000000	USD
CY2009	us-gaap	Restricted Stock Expense RestrictedStockExpense	94000000	USD
CY2009	ace	Restricted Stock Expense Net Of Tax RestrictedStockExpenseNetOfTax	68000000	USD
CY2008	us-gaap	Restricted Stock Expense RestrictedStockExpense	101000000	USD
CY2008	ace	Restricted Stock Expense Net Of Tax RestrictedStockExpenseNetOfTax	71000000	USD
CY2010Q4	ace	Employee Stock Ownership Plan Compensation Expense Basic And Diluted Share Impact EmployeeStockOwnershipPlanCompensationExpenseBasicAndDilutedShareImpact	0.07	USD
CY2009Q4	ace	Employee Stock Ownership Plan Compensation Expense Basic And Diluted Share Impact EmployeeStockOwnershipPlanCompensationExpenseBasicAndDilutedShareImpact	0.07	USD
CY2008Q4	ace	Employee Stock Ownership Plan Compensation Expense Basic And Diluted Share Impact EmployeeStockOwnershipPlanCompensationExpenseBasicAndDilutedShareImpact	0.07	USD
CY2010Q4	us-gaap	Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Awards EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwards	129000000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Awards Weighted Average Period Of Recognition EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsWeightedAveragePeriodOfRecognition	2	pure
CY2009	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	259219	shares
CY2010	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	240979	shares
CY2010Q4	ace	Employee Stock Purchase Plan Annual Contribution Limitation EmployeeStockPurchasePlanAnnualContributionLimitation	25000	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.4	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.4	pure
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTerm	5.7	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.025	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.303	pure
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.025	pure
CY2010	ace	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRate	0.075	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.028	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.454	pure
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.022	pure
CY2009	ace	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Forfeiture Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRate	0.075	pure
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.018	pure
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.322	pure
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0315	pure
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	1612507	shares
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod	2650733	shares
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	309026	shares
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	9923563	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	2339036	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod	537556	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	241939	shares
CY2007Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	11270815	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	11483104	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	2094227	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriod	1328715	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	305723	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	11942893	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	46.80	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	50.38	USD
CY2007Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	42.12	USD
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	60.17	USD
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	46.24	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	38.60	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	45.46	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	7839222	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	46.36	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	40.11	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	49.77	USD
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	36.25	USD
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	54.31	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	27.71	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	50.48	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	2461076	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	1771423	shares
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	257350	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	5305732	shares
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	48.74	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	51.09	USD
CY2007Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	3821707	shares
CY2007Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	53.12	USD
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	1836532	shares
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	1403826	shares
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	371183	shares
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	3883230	shares
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	59.84	USD
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	57.01	USD
CY2010Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue	47.93	USD
CY2008	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	50.96	USD
CY2008Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue	53.75	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	54.85	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue	51.45	USD
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	2603344	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	1447676	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	165469	shares
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	4873429	shares
CY2009	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	39.05	USD
CY2009Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	48.25	USD
CY2010	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	50.79	USD
CY2010Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments In Year One DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearOne	19000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments In Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearTwo	22000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments In Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearThree	22000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments In Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFour	22000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments In Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsInYearFive	23000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments In Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsInFiveFiscalYearsThereafter	122000000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	87000000	USD
CY2009	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	84000000	USD
CY2008	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	77000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	394000000	USD
CY2009Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	368000000	USD
CY2010Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	487000000	USD
CY2009Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	471000000	USD
CY2010Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	93000000	USD
CY2009Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Current And Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent	103000000	USD
CY2010	us-gaap	Defined Benefit Plan Estimated Future Employer Contributions In Next Fiscal Year Description DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYearDescription	17
CY2010	us-gaap	Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year DefinedBenefitPlanAmountsThatWillBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossInNextFiscalYear	2000000	USD
CY2010	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	15000000	USD
CY2009	us-gaap	Defined Benefit Plan Benefits Paid DefinedBenefitPlanBenefitsPaid	20000000	USD
CY2010Q4	ace	Guaranteed Living Benefits Lapse Rate Base Lower Range GuaranteedLivingBenefitsLapseRateBaseLowerRange	0.01	pure
CY2010Q4	ace	Guaranteed Living Benefits Lapse Rate Base Upper Range GuaranteedLivingBenefitsLapseRateBaseUpperRange	0.06	pure
CY2010Q4	ace	Guaranteed Living Benefits Lapse Rate Spike Lower Range GuaranteedLivingBenefitsLapseRateSpikeLowerRange	0.1	pure
CY2010Q4	ace	Guaranteed Living Benefits Lapse Rate Spike Upper Range GuaranteedLivingBenefitsLapseRateSpikeUpperRange	0.3	pure
CY2010Q4	ace	Guaranteed Living Benefits Maximum Annuitization Rates GuaranteedLivingBenefitsMaximumAnnuitizationRates	0.08	pure
CY2010Q4	ace	Guaranteed Living Benefits Maximum Annuitization Rates First Year Utilizing Gmib GuaranteedLivingBenefitsMaximumAnnuitizationRatesFirstYearUtilizingGmib	0.13	pure
CY2010Q4	ace	Guaranteed Living Benefits Weighted Average Maximum Annuitization Rate Lower Range GuaranteedLivingBenefitsWeightedAverageMaximumAnnuitizationRateLowerRange	0.08	pure
CY2010Q4	ace	Guaranteed Living Benefits Weighted Average Maximum Annuitization Rate Middle Range GuaranteedLivingBenefitsWeightedAverageMaximumAnnuitizationRateMiddleRange	0.12	pure
CY2010Q4	ace	Guaranteed Living Benefits Weighted Average Maximum Annuitization Rate Upper Range GuaranteedLivingBenefitsWeightedAverageMaximumAnnuitizationRateUpperRange	0.3	pure
CY2010Q4	ace	Guaranteed Living Benefits Lapse Rate Ultimate Range GuaranteedLivingBenefitsLapseRateUltimateRange	0.1	pure
CY2010Q4	ace	Guaranteed Living Benefits Lapse Rate Ultimate Period GuaranteedLivingBenefitsLapseRateUltimatePeriod	2	pure
CY2010Q4	ace	Guaranteed Living Benefits Adjustment Factor For Valuable Guarantees Lower Range GuaranteedLivingBenefitsAdjustmentFactorForValuableGuaranteesLowerRange	0.15	pure
CY2010Q4	ace	Guaranteed Living Benefits Adjustment Factor For Valuable Guarantees Upper Range GuaranteedLivingBenefitsAdjustmentFactorForValuableGuaranteesUpperRange	0.75	pure
CY2008Q4	ace	Equity Securities Impacted By Fair Value Option Standard EquitySecuritiesImpactedByFairValueOptionStandard	161000000	USD
CY2008	ace	Cumulative Effect Partial Adoption Fair Value Measurements Standard CumulativeEffectPartialAdoptionFairValueMeasurementsStandard	-4000000	USD
CY2010Q4	ace	Guaranteed Minimum Income Benefit Valuation Model Changes Net Liability Impact GuaranteedMinimumIncomeBenefitValuationModelChangesNetLiabilityImpact	-98000000	USD
CY2010Q4	ace	Fair Value Minimum Number Pricing Services Used FairValueMinimumNumberPricingServicesUsed	1	pure
CY2010Q4	ace	Guaranteed Living Benefits Number Of Annuitization Functions GuaranteedLivingBenefitsNumberOfAnnuitizationFunctions	3	pure
CY2010Q4	ace	Fair Value Maximum Maturity Period Short Term Investments FairValueMaximumMaturityPeriodShortTermInvestments	1	pure
CY2010	ace	Schedule Of Other Investments Fair Value And Future Funding Commitments ScheduleOfOtherInvestmentsFairValueAndFutureFundingCommitments	<div><table style="border-collapse:collapse;margin-top:20px;"><tr style="height: 21px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="7" style="width: 251px; border-bottom-style:solid;border-bottom-width:2px;text-align:center;border-color:#000000;min-width:251px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">December 31, 2010</font></td><td style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"> </td><td colspan="5" style="width: 150px; border-bottom-style:solid;border-bottom-width:2px;text-align:center;border-color:#000000;min-width:150px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">December 31, 2009</font></td></tr><tr style="height: 37px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td rowspan="2" style="width: 91px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:91px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Expected Liquidation Period</font></td><td style="width: 10px; border-top-style:solid;border-top-width:2px;text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="2" rowspan="2" style="width: 60px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:60px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Fair Value</font></td><td rowspan="2" style="width: 6px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:6px;"> </td><td colspan="2" rowspan="2" style="width: 84px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:84px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Maximum Future Funding Commitments</font></td><td style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"> </td><td colspan="2" rowspan="2" style="width: 60px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:60px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Fair Value</font></td><td rowspan="2" style="width: 6px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:6px;"> </td><td colspan="2" rowspan="2" style="width: 84px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:84px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">Maximum Future Funding Commitments</font></td></tr><tr style="height: 22px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 51px; border-bottom-style:solid;border-bottom-width:2px;text-align:center;border-color:#000000;min-width:51px;"> </td><td style="width: 75px; border-bottom-style:solid;border-bottom-width:2px;text-align:center;border-color:#000000;min-width:75px;"> </td><td style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"> </td><td style="width: 51px; border-bottom-style:solid;border-bottom-width:2px;text-align:center;border-color:#000000;min-width:51px;"> </td><td style="width: 75px; border-bottom-style:solid;border-bottom-width:2px;text-align:center;border-color:#000000;min-width:75px;"> </td></tr><tr style="height: 2px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; border-top-style:solid;border-top-width:2px;text-align:left;border-color:#000000;min-width:91px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:51px;"> </td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:75px;"> </td><td style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:51px;"> </td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; border-top-style:solid;border-top-width:2px;text-align:center;border-color:#000000;min-width:75px;"> </td></tr><tr style="height: 20px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:left;border-color:#000000;min-width:91px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td colspan="11" style="width: 308px; text-align:center;border-color:#000000;min-width:308px;"><font style="FONT-WEIGHT: bold;FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: center;">(in millions of U.S. dollars)</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:left;border-color:#000000;min-width:91px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:center;border-color:#000000;min-width:51px;"> </td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:center;border-color:#000000;min-width:75px;"> </td><td style="width: 8px; text-align:center;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:center;border-color:#000000;min-width:51px;"> </td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:center;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:center;border-color:#000000;min-width:75px;"> </td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;">Financial</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:right;border-color:#000000;min-width:91px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">5 to 9 Years</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 192</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 151</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 173</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 109</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;">Real estate</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:right;border-color:#000000;min-width:91px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">3 to 9 Years</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 168</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 92</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 89</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 150</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;">Distressed</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:right;border-color:#000000;min-width:91px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">6 to 9 Years</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 243</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 43</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 233</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 59</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;">Mezzanine</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:right;border-color:#000000;min-width:91px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">6 to 9 Years</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 135</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 173</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 102</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 75</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;">Traditional </font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:right;border-color:#000000;min-width:91px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">3 to 8 Years</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 376</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 291</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 243</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 300</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;">Vintage</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:right;border-color:#000000;min-width:91px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">1 to 3 Years</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 27</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 3</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 31</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 2</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;">Investment funds</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:right;border-color:#000000;min-width:91px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">Not Applicable</font></td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 329</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> -</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 310</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; border-bottom-style:solid;border-bottom-width:1px;text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> -</font></td></tr><tr style="height: 19px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:left;border-color:#000000;min-width:91px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 51px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 1,470</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 75px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 753</font></td><td style="width: 8px; text-align:right;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 51px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:51px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 1,181</font></td><td style="width: 6px; text-align:center;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:right;border-color:#000000;min-width:9px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;">$</font></td><td style="width: 75px; border-top-style:solid;border-top-width:1px;border-bottom-style:double;border-bottom-width:3px;text-align:right;border-color:#000000;min-width:75px;"><font style="FONT-FAMILY: Times New Roman;FONT-SIZE: 9pt;COLOR: #000000;TEXT-ALIGN: right;"> 695</font></td></tr><tr style="height: 20px"><td style="width: 130px; text-align:left;border-color:#000000;min-width:130px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 91px; text-align:left;border-color:#000000;min-width:91px;"> </td><td style="width: 10px; text-align:left;border-color:#000000;min-width:10px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:51px;"> </td><td style="width: 6px; text-align:left;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:75px;"> </td><td style="width: 8px; text-align:left;border-color:#000000;min-width:8px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 51px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:51px;"> </td><td style="width: 6px; text-align:left;border-color:#000000;min-width:6px;"> </td><td style="width: 9px; text-align:left;border-color:#000000;min-width:9px;"> </td><td style="width: 75px; border-top-style:double;border-top-width:3px;text-align:left;border-color:#000000;min-width:75px;"> </td></tr></table></div>
CY2010	ace	Other Nonoperating Income Expense Equity In Net Income Loss Of Partially Owned Entities OtherNonoperatingIncomeExpenseEquityInNetIncomeLossOfPartiallyOwnedEntities	-81000000	USD
CY2010	ace	Other Nonoperating Income Expense Noncontrolling Interest Expense OtherNonoperatingIncomeExpenseNoncontrollingInterestExpense	14000000	USD
CY2010	ace	Other Nonoperating Income Expense Federal Excise And Capital Taxes OtherNonoperatingIncomeExpenseFederalExciseAndCapitalTaxes	19000000	USD
CY2010	ace	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	32000000	USD
CY2009	ace	Other Nonoperating Income Expense Equity In Net Income Loss Of Partially Owned Entities OtherNonoperatingIncomeExpenseEquityInNetIncomeLossOfPartiallyOwnedEntities	39000000	USD
CY2009	ace	Other Nonoperating Income Expense Noncontrolling Interest Expense OtherNonoperatingIncomeExpenseNoncontrollingInterestExpense	3000000	USD
CY2009	ace	Other Nonoperating Income Expense Federal Excise And Capital Taxes OtherNonoperatingIncomeExpenseFederalExciseAndCapitalTaxes	16000000	USD
CY2009	ace	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	27000000	USD
CY2008	ace	Other Nonoperating Income Expense Equity In Net Income Loss Of Partially Owned Entities OtherNonoperatingIncomeExpenseEquityInNetIncomeLossOfPartiallyOwnedEntities	-52000000	USD
CY2008	ace	Other Nonoperating Income Expense Noncontrolling Interest Expense OtherNonoperatingIncomeExpenseNoncontrollingInterestExpense	11000000	USD
CY2008	ace	Other Nonoperating Income Expense Federal Excise And Capital Taxes OtherNonoperatingIncomeExpenseFederalExciseAndCapitalTaxes	16000000	USD
CY2008	ace	Other Nonoperating Income Expense Other OtherNonoperatingIncomeExpenseOther	-14000000	USD
CY2010	ace	Underwriting Income Loss Insurance UnderwritingIncomeLossInsurance	1373000000	USD
CY2009	ace	Underwriting Income Loss Insurance UnderwritingIncomeLossInsurance	1552000000	USD
CY2008	ace	Underwriting Income Loss Insurance UnderwritingIncomeLossInsurance	1329000000	USD
CY2009	ace	Product Line Property And All Other Net Premiums Earned ProductLinePropertyAndAllOtherNetPremiumsEarned	4023000000	USD
CY2009	ace	Product Line Casualty Net Premiums Earned ProductLineCasualtyNetPremiumsEarned	5587000000	USD
CY2010	ace	Product Line Life Accident And Health Net Premiums Earned ProductLineLifeAccidentAndHealthNetPremiumsEarned	3854000000	USD
CY2009	ace	Product Line Life Accident And Health Net Premiums Earned ProductLineLifeAccidentAndHealthNetPremiumsEarned	3630000000	USD
CY2010	ace	Product Line Property And All Other Net Premiums Earned ProductLinePropertyAndAllOtherNetPremiumsEarned	3898000000	USD
CY2010	ace	Product Line Casualty Net Premiums Earned ProductLineCasualtyNetPremiumsEarned	5752000000	USD
CY2008	ace	Product Line Property And All Other Net Premiums Earned ProductLinePropertyAndAllOtherNetPremiumsEarned	3954000000	USD
CY2008	ace	Product Line Casualty Net Premiums Earned ProductLineCasualtyNetPremiumsEarned	5838000000	USD
CY2008	ace	Product Line Life Accident And Health Net Premiums Earned ProductLineLifeAccidentAndHealthNetPremiumsEarned	3411000000	USD
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	339685143	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1561244	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	341246387	shares
CY2009	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	336725625	shares
CY2009	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	813669	shares
CY2009	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	337539294	shares
CY2008	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1705518	shares
CY2008	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	334606237	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	256868	shares
CY2009	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1230881	shares
CY2008	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	638401	shares
CY2010	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	3108000000	USD
CY2009	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2549000000	USD
CY2008	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1173000000	USD

Files In Submission

Name	View Source	Status
0001193125-11-047473-index-headers.html	Edgar Link	pending
0001193125-11-047473-index.html	Edgar Link	pending
0001193125-11-047473.txt	Edgar Link	pending
0001193125-11-047473-xbrl.zip	Edgar Link	pending
ace-20101231.xml	Edgar Link	completed
ace-20101231.xsd	Edgar Link	pending
ace-20101231_cal.xml	Edgar Link	unprocessable
ace-20101231_def.xml	Edgar Link	unprocessable
ace-20101231_lab.xml	Edgar Link	unprocessable
ace-20101231_pre.xml	Edgar Link	unprocessable
d10k.htm	Edgar Link	pending
defnref.xml	Edgar Link	unprocessable
dex1017.htm	Edgar Link	pending
dex105.htm	Edgar Link	pending
dex106.htm	Edgar Link	pending
dex1065.htm	Edgar Link	pending
dex107.htm	Edgar Link	pending
dex108.htm	Edgar Link	pending
dex121.htm	Edgar Link	pending
dex211.htm	Edgar Link	pending
dex231.htm	Edgar Link	pending
dex311.htm	Edgar Link	pending
dex312.htm	Edgar Link	pending
dex321.htm	Edgar Link	pending
dex322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
g140812exb_001.jpg	Edgar Link	pending
g140812g49p39.jpg	Edgar Link	pending
R1.xml	Edgar Link	unprocessable
R10.xml	Edgar Link	unprocessable
R11.xml	Edgar Link	unprocessable
R12.xml	Edgar Link	unprocessable
R13.xml	Edgar Link	unprocessable
R14.xml	Edgar Link	unprocessable
R15.xml	Edgar Link	unprocessable
R16.xml	Edgar Link	unprocessable
R17.xml	Edgar Link	unprocessable
R18.xml	Edgar Link	unprocessable
R19.xml	Edgar Link	unprocessable
R2.xml	Edgar Link	unprocessable
R20.xml	Edgar Link	unprocessable
R21.xml	Edgar Link	unprocessable
R22.xml	Edgar Link	unprocessable
R23.xml	Edgar Link	unprocessable
R24.xml	Edgar Link	unprocessable
R25.xml	Edgar Link	unprocessable
R26.xml	Edgar Link	unprocessable
R27.xml	Edgar Link	unprocessable
R28.xml	Edgar Link	unprocessable
R29.xml	Edgar Link	unprocessable
R3.xml	Edgar Link	unprocessable
R30.xml	Edgar Link	unprocessable
R31.xml	Edgar Link	unprocessable
R32.xml	Edgar Link	unprocessable
R33.xml	Edgar Link	unprocessable
R34.xml	Edgar Link	unprocessable
R35.xml	Edgar Link	unprocessable
R36.xml	Edgar Link	unprocessable
R37.xml	Edgar Link	unprocessable
R38.xml	Edgar Link	unprocessable
R39.xml	Edgar Link	unprocessable
R4.xml	Edgar Link	unprocessable
R40.xml	Edgar Link	unprocessable
R41.xml	Edgar Link	unprocessable
R42.xml	Edgar Link	unprocessable
R43.xml	Edgar Link	unprocessable
R44.xml	Edgar Link	unprocessable
R45.xml	Edgar Link	unprocessable
R46.xml	Edgar Link	unprocessable
R47.xml	Edgar Link	unprocessable
R48.xml	Edgar Link	unprocessable
R49.xml	Edgar Link	unprocessable
R5.xml	Edgar Link	unprocessable
R50.xml	Edgar Link	unprocessable
R51.xml	Edgar Link	unprocessable
R52.xml	Edgar Link	unprocessable
R53.xml	Edgar Link	unprocessable
R54.xml	Edgar Link	unprocessable
R55.xml	Edgar Link	unprocessable
R56.xml	Edgar Link	unprocessable
R57.xml	Edgar Link	unprocessable
R58.xml	Edgar Link	unprocessable
R59.xml	Edgar Link	unprocessable
R6.xml	Edgar Link	unprocessable
R60.xml	Edgar Link	unprocessable
R61.xml	Edgar Link	unprocessable
R62.xml	Edgar Link	unprocessable
R63.xml	Edgar Link	unprocessable
R64.xml	Edgar Link	unprocessable
R65.xml	Edgar Link	unprocessable
R66.xml	Edgar Link	unprocessable
R67.xml	Edgar Link	unprocessable
R68.xml	Edgar Link	unprocessable
R69.xml	Edgar Link	unprocessable
R7.xml	Edgar Link	unprocessable
R70.xml	Edgar Link	unprocessable
R71.xml	Edgar Link	unprocessable
R72.xml	Edgar Link	unprocessable
R73.xml	Edgar Link	unprocessable
R74.xml	Edgar Link	unprocessable
R75.xml	Edgar Link	unprocessable
R76.xml	Edgar Link	unprocessable
R77.xml	Edgar Link	unprocessable
R78.xml	Edgar Link	unprocessable
R79.xml	Edgar Link	unprocessable
R8.xml	Edgar Link	unprocessable
R80.xml	Edgar Link	unprocessable
R81.xml	Edgar Link	unprocessable
R82.xml	Edgar Link	unprocessable
R83.xml	Edgar Link	unprocessable
R84.xml	Edgar Link	unprocessable
R85.xml	Edgar Link	unprocessable
R86.xml	Edgar Link	unprocessable
R87.xml	Edgar Link	unprocessable
R9.xml	Edgar Link	unprocessable

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$CB
Chubb Ltd Stock $cb

2010 Q4 Form 10-K Financial Statement

#000119312511047473 Filed on February 25, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CB Chubb Ltd Stock $cb

2010 Q4 Form 10-K Financial Statement

#000119312511047473 Filed on February 25, 2011

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CB
Chubb Ltd Stock $cb