$CB
Chubb Ltd Stock $cb

$cb Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000089615920000014 Filed on October 30, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue	$9.848B	$9.464B	$9.045B
YoY Change	12.7%	4.63%	3.37%
Cost Of Revenue		$5.835B	$5.052B
YoY Change		15.5%	3.78%
Gross Profit		$3.629B	$3.993B
YoY Change		-9.12%	2.86%
Gross Profit Margin		38.35%	44.15%
Selling, General & Admin	$784.0M	$737.0M	$757.0M
YoY Change	-3.92%	-2.64%	4.27%
% of Gross Profit		20.31%	18.96%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$73.00M	$1.645B	$1.603B
YoY Change	-3.95%	2.62%	6.58%
% of Gross Profit		45.33%	40.15%
Operating Expenses	$7.598B	$8.487B	$7.646B
YoY Change	0.98%	11.0%	4.63%
Operating Profit		-$4.858B	-$3.653B
YoY Change		32.99%	6.63%
Interest Expense	$458.0M	$349.0M	-$57.00M
YoY Change	252.31%	-712.28%	-507.14%
% of Operating Profit
Other Income/Expense, Net	-$6.000M	$485.0M	-$12.00M
YoY Change	-50.0%	-4141.67%	0.0%
Pretax Income	$2.752B	$1.336B	$1.321B
YoY Change	105.07%	1.14%	-6.58%
Income Tax	$334.0M	$142.0M	$230.0M
% Of Pretax Income	12.14%	10.63%	17.41%
Net Earnings	$2.418B	$1.194B	$1.091B
YoY Change	106.14%	9.44%	-11.37%
Net Earnings / Revenue	24.55%	12.62%	12.06%
Basic Earnings Per Share		$2.64	$2.40
Diluted Earnings Per Share	$5.338M	$2.63	$2.38
COMMON SHARES
Basic Shares Outstanding	451.4M shares	451.8M shares	455.0M shares
Diluted Shares Outstanding		453.3M shares	458.2M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$1.747B	$1.707B	$1.478B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$2.000B	$470.0M	$577.0M
YoY Change	5.26%	-18.54%
Goodwill	$15.40B	$15.25B	$15.23B
YoY Change	0.68%	0.16%	-0.67%
Intangibles	$5.811B	$5.849B	$6.148B
YoY Change	-4.16%	-4.86%	0.15%
Long-Term Investments	$121.5B	$118.6B	$108.2B
YoY Change	9.87%	9.55%	6.31%
Other Assets	$89.00M	$166.0M	$111.0M
YoY Change	-18.35%	49.55%	6.73%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$190.8B	$187.8B	$175.1B
YoY Change	7.82%	7.22%	4.45%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$13.54B	$12.56B	$11.49B
YoY Change	22.33%	9.31%	22.95%
Accrued Expenses	$517.0M	$517.0M	$617.0M
YoY Change	-14.26%	-16.21%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$1.300B	$10.00M
YoY Change	-100.0%	12900.0%	-98.0%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$20.76B	$20.79B	$18.46B
YoY Change	8.41%	12.67%	14.23%
LONG-TERM LIABILITIES
Long-Term Debt	$15.26B	$15.14B	$13.59B
YoY Change	10.02%	11.37%	9.12%
Other Long-Term Liabilities			$998.0M
YoY Change			120.31%
Total Long-Term Liabilities	$15.26B	$15.14B	$14.59B
YoY Change	2.6%	3.75%	13.02%
TOTAL LIABILITIES
Total Short-Term Liabilities	$20.76B	$20.79B	$18.46B
Total Long-Term Liabilities	$15.26B	$15.14B	$14.59B
Total Liabilities	$131.3B	$131.4B	$120.6B
YoY Change	7.99%	8.95%	3.28%
SHAREHOLDERS EQUITY
Retained Earnings	$39.34B	$36.92B	$34.97B
YoY Change	8.84%	5.58%	11.04%
Common Stock	$20.88B	$21.18B	$22.59B
YoY Change	-6.47%	-6.23%	-5.79%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$3.644B	$3.541B	$3.504B
YoY Change	-2.93%	1.06%	47.72%
Treasury Stock Shares	26.87M shares	26.23M shares	26.25M shares
Shareholders Equity	$59.44B	$56.41B	$54.57B
YoY Change
Total Liabilities & Shareholders Equity	$190.8B	$187.8B	$175.1B
YoY Change	7.82%	7.22%	4.45%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	$2.418B	$1.194B	$1.091B
YoY Change	106.14%	9.44%	-11.37%
Depreciation, Depletion And Amortization	$73.00M	$1.645B	$1.603B
YoY Change	-3.95%	2.62%	6.58%
Cash From Operating Activities	$2.544B	$3.544B	$2.205B
YoY Change	78.03%	60.73%	29.71%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$792.0M	-$4.035B	-$1.274B
YoY Change	-66.21%	216.72%	46.94%
Cash From Investing Activities	-$792.0M	-$4.035B	-$1.274B
YoY Change	-66.21%	216.72%	46.94%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-1.848B	664.0M	-693.0M
YoY Change	-289.93%	-195.82%	-10.58%
NET CHANGE
Cash From Operating Activities	2.544B	3.544B	2.205B
Cash From Investing Activities	-792.0M	-4.035B	-1.274B
Cash From Financing Activities	-1.848B	664.0M	-693.0M
Net Change In Cash	-96.00M	173.0M	238.0M
YoY Change	-265.52%	-27.31%	310.34%
FREE CASH FLOW
Cash From Operating Activities	$2.544B	$3.544B	$2.205B
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Amendment Flag AmendmentFlag	false
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Entity Registrant Name EntityRegistrantName	Chubb Ltd
	dei	Entity Central Index Key EntityCentralIndexKey	0000896159
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201613Member
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	1-11778
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	V8
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-0091805
	dei	Entity Address Address Line1 EntityAddressAddressLine1	Baerengasse 32
	dei	Entity Address City Or Town EntityAddressCityOrTown	Zurich
	dei	Country Region CountryRegion	41
	dei	City Area Code CityAreaCode	(0)43
	dei	Local Phone Number LocalPhoneNumber	456 76 00
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Address Country EntityAddressCountry	CH
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	8001
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	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	515000000	USD
CY2020Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	1645000000	USD
CY2019Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	1603000000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	4853000000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	4611000000	USD
CY2020Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	733000000	USD
CY2019Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	752000000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	2201000000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	2220000000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-130000000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-138000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-390000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-418000000	USD
CY2020Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	485000000	USD
CY2019Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	57000000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	372000000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	326000000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	72000000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	76000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	217000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	229000000	USD
CY2020Q3	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	0	USD
CY2019Q3	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	2000000	USD
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	0	USD
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	9000000	USD
CY2020Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	8128000000	USD
CY2019Q3	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	7724000000	USD
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	24736000000	USD
	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	21541000000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1336000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1321000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1410000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3907000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	7000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-35000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-2000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	142000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	230000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	295000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	626000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1194000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1091000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	1115000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	3281000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	687000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	694000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	1456000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3791000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	49000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-11000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-303000000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-43000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	638000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	705000000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	1759000000	USD
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	3834000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	246000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-193000000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-168000000	USD
	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-143000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	23000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	17000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	59000000	USD
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax	62000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	861000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	495000000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	1532000000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax OtherComprehensiveIncomeLossBeforeTax	3629000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	103000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	113000000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	295000000	USD
	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	660000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	758000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	382000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1237000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2969000000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1952000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1473000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2352000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	6250000000	USD
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.64
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.40
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.47
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.18
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.63
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.38
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.46
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.13
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	56413000000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	54572000000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	56413000000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	54572000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	1115000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	3281000000	USD
	cb	Net Realized Gains Losses NetRealizedGainsLosses	-1069000000	USD
	cb	Net Realized Gains Losses NetRealizedGainsLosses	-475000000	USD
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	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-294000000	USD
	us-gaap	Present Value Of Future Insurance Profits Amortization Expense1 PresentValueOfFutureInsuranceProfitsAmortizationExpense1	217000000	USD
	us-gaap	Present Value Of Future Insurance Profits Amortization Expense1 PresentValueOfFutureInsuranceProfitsAmortizationExpense1	229000000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	287000000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	77000000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	178000000	USD
	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	5112000000	USD
	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	277000000	USD
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	881000000	USD
	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	1061000000	USD
	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	138000000	USD
	us-gaap	Increase Decrease In Future Policy Benefit Reserves IncreaseDecreaseInFuturePolicyBenefitReserves	148000000	USD
	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	280000000	USD
	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	-114000000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	190000000	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-6000000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-95000000	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	83000000	USD
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	324000000	USD
	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	371000000	USD
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	496000000	USD
	us-gaap	Increase Decrease In Reinsurance Recoverable IncreaseDecreaseInReinsuranceRecoverable	-426000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1014000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	333000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	7241000000	USD
	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	266000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	762000000	USD
	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	426000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4913000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	20793000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	19778000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	42000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	143000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	3622000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	466000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	9537000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	10430000000	USD
	cb	Proceeds From Sales To Be Announced Mortgage Backed Securities ProceedsFromSalesToBeAnnouncedMortgageBackedSecurities	0	USD
	cb	Proceeds From Sales To Be Announced Mortgage Backed Securities ProceedsFromSalesToBeAnnouncedMortgageBackedSecurities	6000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	1526000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	577000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	8709000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	6390000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	841000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	814000000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	434000000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-202000000	USD
	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	74000000	USD
	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	647000000	USD
	us-gaap	Payments To Acquire Limited Partnership Interests PaymentsToAcquireLimitedPartnershipInterests	1056000000	USD
	us-gaap	Payments To Acquire Limited Partnership Interests PaymentsToAcquireLimitedPartnershipInterests	1093000000	USD
	us-gaap	Proceeds From Limited Partnership Investments ProceedsFromLimitedPartnershipInvestments	588000000	USD
	us-gaap	Proceeds From Limited Partnership Investments ProceedsFromLimitedPartnershipInvestments	973000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	352000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	497000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6729000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3561000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1035000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1286000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1203000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	988000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	501000000	USD
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	us-gaap	Proceeds From Short Term Debt ProceedsFromShortTermDebt	2394000000	USD
	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	1402000000	USD
	us-gaap	Repayments Of Short Term Debt RepaymentsOfShortTermDebt	2396000000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	77000000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	155000000	USD
	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	322000000	USD
	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	376000000	USD
	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	253000000	USD
	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	221000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-234000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1124000000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-51000000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	21000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	227000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	249000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1646000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1340000000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1873000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1589000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	668000000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	733000000	USD
	us-gaap	Interest Paid Net InterestPaidNet	323000000	USD
	us-gaap	Interest Paid Net InterestPaidNet	327000000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1707000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1537000000	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	166000000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	109000000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1873000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1646000000	USD
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	-42000000	USD
	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:700;line-height:120%">Accounting guidance not yet adopted</span></div><div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-style:italic;font-weight:700;line-height:120%">Effects of Reference Rate Reform on Financial Reporting</span></div><div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:120%">In March 2020, the FASB issued guidance which provides optional expedients and exceptions for applying GAAP to investments, derivatives, or other transactions that reference the London Interbank Offered Rate (LIBOR) or another reference rate expected to be discontinued because of reference rate reform. Along with the optional expedients, the amendments include a general principle that permits an entity to consider contract modifications due to reference reform to be an event that does not require contract re-measurement at the modification date or reassessment of a previous accounting determination. Additionally, a company may make a one-time election to sell, transfer, or both sell and transfer debt securities classified as held to maturity that reference a rate affected by reference rate reform and that were classified as held to maturity before January 1, 2020. This standard may be elected over time through December 31, 2022 as reference rate reform activities occur. We are currently assessing the effect of adopting this guidance on our financial condition and results of operations. </span></div><div><span><br/></span></div><div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-style:italic;font-weight:700;line-height:120%">Targeted Improvements to the Accounting for Long-Duration Contracts</span></div><div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:115%">In August 2018, the FASB issued guidance to improve the existing recognition, measurement, presentation, and disclosure requirements for long-duration contracts issued by an insurance entity. The amendments in this update require more frequent updating of assumptions and a standardized discount rate for the future policy benefit liability, a requirement to use the fair value measurement model for policies with market risk benefits, simplified amortization of deferred acquisition costs, and enhanced disclosures. This standard will be effective in the first quarter of 2023 with early adoption permitted. We are currently assessing the effect of adopting this guidance on our financial condition and results of operations. We will be better able to quantify the effect of adopting this standard as we progress in our implementation process and draw nearer to the date of adoption.</span></div>
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	85201000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	34000000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5050000000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	365000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	89852000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	11696000000	USD
CY2020Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	45000000	USD
CY2020Q3	cb	Debtsecuritiesheldtomaturitynetcarryingvalue Debtsecuritiesheldtomaturitynetcarryingvalue	11651000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	831000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	9000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	12473000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	82580000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	3074000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	166000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	85488000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities	30000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	12581000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	427000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	3000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	13005000000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Heldtomaturity Debt Securities AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities	0	USD
CY2020Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	11696000000	USD
CY2020Q3	cb	Fixed Maturities Percentof Total Amortizedcost FixedMaturitiesPercentofTotalAmortizedcost	1
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	4703000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	4703000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	3951000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	3973000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	26319000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	26319000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	27142000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	27720000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	26456000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	26456000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	23901000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	24874000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	13037000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	13037000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	8874000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	9729000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	70515000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	70515000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	63868000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	66296000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	19337000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	19337000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	18712000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	19192000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	89852000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	89852000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	82580000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	85488000000	USD
CY2020Q3	cb	Debtsecurities Heldtomaturitymaturityallocatedandsinglematuritydatewithinoneyearnetcarryingvalue DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydatewithinoneyearnetcarryingvalue	1045000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	1056000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	478000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	479000000	USD
CY2020Q3	cb	Debtsecurities Heldtomaturitymaturityallocatedandsinglematuritydateafteronethroughfiveyearsnetcarryingvalue DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydateafteronethroughfiveyearsnetcarryingvalue	3501000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	3667000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	3869000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	3940000000	USD
CY2020Q3	cb	Debtsecurities Heldtomaturitymaturityallocatedandsinglematuritydateafterfivethroughtenyearsnetcarryingvalue DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydateafterfivethroughtenyearsnetcarryingvalue	3119000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	3315000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	3756000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	3883000000	USD
CY2020Q3	cb	Debtsecurities Heldtomaturitymaturityallocatedandsinglematuritydateafter10yearsnetcarryingvalue DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydateafter10yearsnetcarryingvalue	1883000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	2182000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	2147000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	2307000000	USD
CY2020Q3	cb	Debtsecurities Heldtomaturitymaturityallocatedandsinglematuritydatenetcarryingvalue DebtsecuritiesHeldtomaturitymaturityallocatedandsinglematuritydatenetcarryingvalue	9548000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	10220000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	10250000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	10609000000	USD
CY2020Q3	cb	Debtsecurities Heldtomaturitymaturitywithoutsinglematuritydatenetcarryingvalue DebtsecuritiesHeldtomaturitymaturitywithoutsinglematuritydatenetcarryingvalue	2103000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	2253000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount	2331000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	2396000000	USD
CY2020Q3	cb	Debtsecuritiesheldtomaturitynetcarryingvalue Debtsecuritiesheldtomaturitynetcarryingvalue	11651000000	USD
CY2020Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	12473000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	12581000000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	13005000000	USD
CY2020Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	0	USD
CY2019Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	30000000	USD
CY2020Q3	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	0	USD
	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	31000000	USD
CY2020Q3	cb	Debt Securities Available For Sale Credit Impairment Charges Intentto Sell DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell	11000000	USD
CY2019Q3	cb	Debt Securities Available For Sale Credit Impairment Charges Intentto Sell DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell	0	USD
	cb	Debt Securities Available For Sale Credit Impairment Charges Intentto Sell DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell	163000000	USD
	cb	Debt Securities Available For Sale Credit Impairment Charges Intentto Sell DebtSecuritiesAvailableForSaleCreditImpairmentChargesIntenttoSell	0	USD
CY2020Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-222000000	USD
CY2019Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	84000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-351000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	86000000	USD
CY2020Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	46000000	USD
CY2019Q3	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-106000000	USD
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-426000000	USD
	us-gaap	Fair Value Option Changes In Fair Value Gain Loss1 FairValueOptionChangesInFairValueGainLoss1	-57000000	USD
CY2020Q3	us-gaap	Gain Loss On Sale Of Other Investments GainLossOnSaleOfOtherInvestments	-3000000	USD
CY2019Q3	us-gaap	Gain Loss On Sale Of Other Investments GainLossOnSaleOfOtherInvestments	-4000000	USD
	us-gaap	Gain Loss On Sale Of Other Investments GainLossOnSaleOfOtherInvestments	-43000000	USD
	us-gaap	Gain Loss On Sale Of Other Investments GainLossOnSaleOfOtherInvestments	-4000000	USD
CY2020Q3	cb	Net Realized Gains Losses NetRealizedGainsLosses	-141000000	USD
CY2019Q3	cb	Net Realized Gains Losses NetRealizedGainsLosses	-155000000	USD
	cb	Net Realized Gains Losses NetRealizedGainsLosses	-1069000000	USD
	cb	Net Realized Gains Losses NetRealizedGainsLosses	-475000000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	69000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	5000000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Period Increase Decrease DebtSecuritiesAvailableForSaleAllowanceForCreditLossPeriodIncreaseDecrease	183000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	0	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	5000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	0	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	-5000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery	-40000000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Recovery DebtSecuritiesAvailableForSaleAllowanceForCreditLossRecovery	-174000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	34000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	34000000	USD
CY2020Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	51000000	USD
CY2019Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	0	USD
CY2020Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease	2000000	USD
	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Period Increase Decrease DebtSecuritiesHeldToMaturityAllowanceForCreditLossPeriodIncreaseDecrease	9000000	USD
CY2020Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Recovery DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery	-8000000	USD
	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Recovery DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery	-8000000	USD
CY2020Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	45000000	USD
CY2020Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	45000000	USD
	us-gaap	Debt Securities Available For Sale Purchased With Credit Deterioration Amount At Purchase Price DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtPurchasePrice	108000000	USD
	us-gaap	Debt Securities Available For Sale Purchased With Credit Deterioration Allowance For Credit Loss At Acquisition Date DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate	5000000	USD
	us-gaap	Debt Securities Available For Sale Purchased With Credit Deterioration Amount At Par Value DebtSecuritiesAvailableForSalePurchasedWithCreditDeteriorationAmountAtParValue	144000000	USD
CY2020Q3	us-gaap	Alternative Investment AlternativeInvestment	5694000000	USD
CY2020Q3	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	3297000000	USD
CY2019Q4	us-gaap	Alternative Investment AlternativeInvestment	4921000000	USD
CY2019Q4	us-gaap	Fair Value Investments Entities That Calculate Net Asset Value Per Share Unfunded Committments FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments	3263000000	USD
CY2020Q3	us-gaap	Restricted Investments RestrictedInvestments	20000000000.0	USD
CY2019Q4	us-gaap	Restricted Investments RestrictedInvestments	21000000000.0	USD
CY2020Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	166000000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	109000000	USD
CY2020Q3	us-gaap	Assets Held In Trust AssetsHeldInTrust	12746000000	USD
CY2019Q4	us-gaap	Assets Held In Trust AssetsHeldInTrust	14004000000	USD
CY2020Q3	cb	Restricted Assets Deposits With Non United States Regulatory Authorities RestrictedAssetsDepositsWithNonUnitedStatesRegulatoryAuthorities	2448000000	USD
CY2019Q4	cb	Restricted Assets Deposits With Non United States Regulatory Authorities RestrictedAssetsDepositsWithNonUnitedStatesRegulatoryAuthorities	2466000000	USD
CY2020Q3	cb	Restricted Assets Deposits With United States Regulatory Authorities RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities	2957000000	USD
CY2019Q4	cb	Restricted Assets Deposits With United States Regulatory Authorities RestrictedAssetsDepositsWithUnitedStatesRegulatoryAuthorities	2709000000	USD
CY2020Q3	us-gaap	Pledged Financial Instruments Not Separately Reported Securities For Repurchase Agreements PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements	1433000000	USD
CY2019Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities For Repurchase Agreements PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements	1464000000	USD
CY2020Q3	us-gaap	Other Restricted Assets Current OtherRestrictedAssetsCurrent	577000000	USD
CY2019Q4	us-gaap	Other Restricted Assets Current OtherRestrictedAssetsCurrent	490000000	USD
CY2020Q3	us-gaap	Restricted Cash And Investments RestrictedCashAndInvestments	20161000000	USD
CY2019Q4	us-gaap	Restricted Cash And Investments RestrictedCashAndInvestments	21133000000	USD
	us-gaap	Fair Value Measurements Valuation Processes Description FairValueMeasurementsValuationProcessesDescription	Actuarial model
CY2020Q3	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	14767000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverables On Unpaid Losses Allowance ReinsuranceRecoverablesOnUnpaidLossesAllowance	255000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	14181000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverables On Unpaid Losses Allowance ReinsuranceRecoverablesOnUnpaidLossesAllowance	240000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverables On Paid Losses ReinsuranceRecoverablesOnPaidLosses	903000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverables On Paid Losses Allowance ReinsuranceRecoverablesOnPaidLossesAllowance	65000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverables On Paid Losses ReinsuranceRecoverablesOnPaidLosses	1000000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverables On Paid Losses Allowance ReinsuranceRecoverablesOnPaidLossesAllowance	76000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverables On Paid And Unpaid Losses ReinsuranceRecoverablesOnPaidAndUnpaidLosses	15670000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	320000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverables On Paid And Unpaid Losses ReinsuranceRecoverablesOnPaidAndUnpaidLosses	15181000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	316000000	USD
CY2020Q3	cb	Reinsurance Recoverable Future Policy Benefits ReinsuranceRecoverableFuturePolicyBenefits	203000000	USD
CY2020Q3	cb	Reinsurance Recoverables On Future Policy Benefits Allowance ReinsuranceRecoverablesOnFuturePolicyBenefitsAllowance	4000000	USD
CY2019Q4	cb	Reinsurance Recoverable Future Policy Benefits ReinsuranceRecoverableFuturePolicyBenefits	197000000	USD
CY2019Q4	cb	Reinsurance Recoverables On Future Policy Benefits Allowance ReinsuranceRecoverablesOnFuturePolicyBenefitsAllowance	4000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	316000000	USD
	us-gaap	Reinsurance Recoverable Credit Loss Expense Reversal ReinsuranceRecoverableCreditLossExpenseReversal	21000000	USD
	us-gaap	Reinsurance Loss On Uncollectible Accounts In Period Amount ReinsuranceLossOnUncollectibleAccountsInPeriodAmount	19000000	USD
	cb	Reinsurance Recoverable Allowance For Credit Loss Other ReinsuranceRecoverableAllowanceForCreditLossOther	2000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverables Allowance ReinsuranceRecoverablesAllowance	320000000	USD
	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div style="text-align:justify"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:120%">The following table presents a reconciliation of beginning and ending Unpaid losses and loss expenses:</span></div><div style="margin-bottom:5pt;margin-top:8pt;text-align:center"><table style="border-collapse:collapse;display:inline-table;vertical-align:top;width:100.000%"><tr><td style="width:1.0%"/><td style="width:73.617%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.188%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:0.506%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.189%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:0 1pt"/><td colspan="9" style="padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">Nine Months Ended September 30</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">(in millions of U.S. dollars)</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">2020</span></td><td colspan="3" style="border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">2019</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Gross unpaid losses and loss expenses – beginning of period</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">62,690</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">62,960 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Reinsurance recoverable on unpaid losses - beginning of period </span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:4.55pt;font-weight:400;line-height:100%;position:relative;top:-2.44pt;vertical-align:baseline">(1)</span></div></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">(14,181)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">(14,689)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Net unpaid losses and loss expenses – beginning of period</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">48,509</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">48,271 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/></tr><tr><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Net losses and loss expenses incurred in respect of losses occurring in:</span></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Current year</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">17,109</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">14,484 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Prior years </span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:4.55pt;font-weight:400;line-height:100%;position:relative;top:-2.44pt;vertical-align:baseline">(2)</span></div></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">(212)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">(619)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Total</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">16,897</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">13,865 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Net losses and loss expenses paid in respect of losses occurring in:</span></td><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Current year</span></td><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">4,766</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">4,920 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Prior years</span></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">7,597</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">8,374 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Total</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">12,363</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">13,294 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Foreign currency revaluation and other</span></td><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">95</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">(162)</span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Net unpaid losses and loss expenses – end of period</span></td><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">53,138</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-top:1pt solid #000000;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">48,680 </span></td><td style="background-color:#cceeff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:bottom"><div><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Reinsurance recoverable on unpaid losses </span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:4.55pt;font-weight:400;line-height:100%;position:relative;top:-2.44pt;vertical-align:baseline">(1)</span></div></td><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">14,767</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">14,332 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:9.75pt;font-weight:400;line-height:100%">Gross unpaid losses and loss expenses – end of period</span></td><td style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:700;line-height:100%">67,905</span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%"> </span></td><td style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:0 1pt"/><td style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:8.5pt;font-weight:400;line-height:100%">63,012 </span></td><td style="background-color:#cceeff;border-bottom:2pt solid #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table></div><div style="margin-top:3pt;padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:4.55pt;font-weight:400;line-height:120%;position:relative;top:-2.44pt;vertical-align:baseline">(1) </span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:7pt;font-weight:400;line-height:120%">Net of valuation allowance for uncollectible reinsurance. </span></div><div style="margin-top:3pt;padding-left:18pt;text-indent:-18pt"><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:4.55pt;font-weight:400;line-height:120%;position:relative;top:-2.44pt;vertical-align:baseline">(2) </span><span style="color:#000000;font-family:'News Gothic',sans-serif;font-size:7pt;font-weight:400;line-height:120%">Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments and earned premiums totaling $23 million and $60 million for the nine months ended September 30, 2020 and 2019, respectively.</span></div>
CY2019Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	62690000000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	62960000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	14181000000	USD
CY2018Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	14689000000	USD
CY2019Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	48509000000	USD
CY2018Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	48271000000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	17109000000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Current Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense	14484000000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-212000000	USD
	us-gaap	Supplemental Information For Property Casualty Insurance Underwriters Prior Year Claims And Claims Adjustment Expense SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense	-619000000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	16897000000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1	13865000000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	4766000000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1	4920000000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	7597000000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years1 LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1	8374000000	USD
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	12363000000	USD
	us-gaap	Payments For Losses And Loss Adjustment Expense PaymentsForLossesAndLossAdjustmentExpense	13294000000	USD
CY2020Q3	cb	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther	95000000	USD
CY2019Q3	cb	Liability For Unpaid Claims And Claims Adjustment Expense Foreign Currency Revaluation And Other LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseForeignCurrencyRevaluationAndOther	-162000000	USD
CY2020Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	53138000000	USD
CY2019Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	48680000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	14767000000	USD
CY2019Q3	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	14332000000	USD
CY2020Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	67905000000	USD
CY2019Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	63012000000	USD
	cb	Prior Period Developmentnetadjustments PriorPeriodDevelopmentnetadjustments	23000000	USD
	cb	Prior Period Developmentnetadjustments PriorPeriodDevelopmentnetadjustments	60000000	USD
	cb	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Period Increase Decrease Gross LiabilityforUnpaidClaimsandClaimsAdjustmentExpensePeriodIncreaseDecreaseGross	5215000000	USD
	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Period Increase Decrease LiabilityForUnpaidClaimsAndClaimsAdjustmentExpensePeriodIncreaseDecrease	4629000000	USD
CY2020Q3	cb	Net Prior Period Development NetPriorPeriodDevelopment	-146000000	USD
	cb	Net Prior Period Development NetPriorPeriodDevelopment	-189000000	USD
CY2019Q3	cb	Net Prior Period Development NetPriorPeriodDevelopment	-167000000	USD
	cb	Net Prior Period Development NetPriorPeriodDevelopment	-559000000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	45000000	USD
CY2019Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	75000000	USD
CY2020Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	4000000	USD
CY2019Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-223000000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-420000000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-562000000	USD
CY2020Q3	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	1851000000	USD
CY2019Q4	us-gaap	Securities Held As Collateral At Fair Value SecuritiesHeldAsCollateralAtFairValue	994000000	USD
CY2020Q3	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	1851000000	USD
CY2019Q4	us-gaap	Obligation To Return Securities Received As Collateral ObligationToReturnSecuritiesReceivedAsCollateral	994000000	USD
CY2020Q3	us-gaap	Secured Debt Repurchase Agreements SecuredDebtRepurchaseAgreements	1413000000	USD
CY2019Q4	us-gaap	Secured Debt Repurchase Agreements SecuredDebtRepurchaseAgreements	1416000000	USD
CY2020Q3	us-gaap	Pledged Financial Instruments Not Separately Reported Securities For Repurchase Agreements PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements	1433000000	USD
CY2019Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities For Repurchase Agreements PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements	1464000000	USD
CY2020Q3	us-gaap	Secured Debt Repurchase Agreements SecuredDebtRepurchaseAgreements	1413000000	USD
CY2019Q4	us-gaap	Secured Debt Repurchase Agreements SecuredDebtRepurchaseAgreements	1416000000	USD
CY2020Q3	us-gaap	Purchase Commitment Remaining Minimum Amount Committed PurchaseCommitmentRemainingMinimumAmountCommitted	695000000	USD
CY2020Q3	cb	Other Investments Limited Partnerships And Partially Owned Investment Companies Carrying Value OtherInvestmentsLimitedPartnershipsAndPartiallyOwnedInvestmentCompaniesCarryingValue	5500000000	USD
CY2020Q3	us-gaap	Other Commitment OtherCommitment	3300000000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	50000000	USD
CY2020Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	470000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	551000000	USD
CY2020Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	517000000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	603000000	USD
CY2020Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	24.15
CY2019Q2	cb	Annualdividendpershareapprovedbyshareholders Annualdividendpershareapprovedbyshareholders	3.00
CY2018Q2	cb	Annualdividendpershareapprovedbyshareholders Annualdividendpershareapprovedbyshareholders	2.92
CY2019Q2	cb	Common Stock Dividend Rate Approved CommonStockDividendRateApproved	0.75
CY2018Q2	cb	Common Stock Dividend Rate Approved CommonStockDividendRateApproved	0.73
CY2020Q2	cb	Annualdividendpershareapprovedbyshareholders Annualdividendpershareapprovedbyshareholders	3.12
CY2020Q2	cb	Common Stock Dividend Rate Approved CommonStockDividendRateApproved	0.78
CY2020Q3	us-gaap	Treasury Stock Shares Retired TreasuryStockSharesRetired	2178600	shares
CY2020Q3	us-gaap	Treasury Stock Shares TreasuryStockShares	26229070	shares
	us-gaap	Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures	1670777	shares
CY2020Q3	us-gaap	Premiums Written Net PremiumsWrittenNet	9078000000	USD
CY2020Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	8765000000	USD
CY2020Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5835000000	USD
CY2020Q3	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	198000000	USD
CY2020Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	1645000000	USD
CY2020Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	733000000	USD
CY2020Q3	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	354000000	USD
CY2020Q3	us-gaap	Net Investment Income NetInvestmentIncome	840000000	USD
CY2020Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	485000000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	72000000	USD
CY2020Q3	cb	Segment Underwriting Income Lossand Net Investment Income Loss SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss	1607000000	USD
CY2020Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-141000000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-130000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	142000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1194000000	USD
CY2019Q3	us-gaap	Premiums Written Net PremiumsWrittenNet	8622000000	USD
CY2019Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	8327000000	USD
CY2019Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5052000000	USD
CY2019Q3	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	158000000	USD
CY2019Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	1603000000	USD
CY2019Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	752000000	USD
CY2019Q3	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	762000000	USD
CY2019Q3	us-gaap	Net Investment Income NetInvestmentIncome	873000000	USD
CY2019Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	57000000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	76000000	USD
CY2019Q3	cb	Segment Underwriting Income Lossand Net Investment Income Loss SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss	1616000000	USD
CY2019Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-155000000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-138000000	USD
CY2019Q3	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	2000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	230000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1091000000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	25410000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	24687000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	16897000000	USD
	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	550000000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	4853000000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	2201000000	USD
	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	186000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	2528000000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	372000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	217000000	USD
	cb	Segment Underwriting Income Lossand Net Investment Income Loss SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss	2869000000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-1069000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-390000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	295000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	1115000000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	24278000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	23355000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	13865000000	USD
	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	515000000	USD
	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	4611000000	USD
	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	2220000000	USD
	us-gaap	Underwriting Income Loss UnderwritingIncomeLoss	2144000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	2568000000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	326000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	229000000	USD
	cb	Segment Underwriting Income Lossand Net Investment Income Loss SegmentUnderwritingIncomeLossandNetInvestmentIncomeLoss	4809000000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-475000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-418000000	USD
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	9000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	626000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	3281000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1194000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1091000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	1115000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	3281000000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	451794046	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	454975143	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	451683093	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	456987560	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1471434	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3175226	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1894699	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2937026	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	453265480	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	458150369	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	453577792	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	459924586	shares
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.64
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.40
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.47
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	7.18
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.63
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.38
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.46
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	7.13
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	7053316	shares
CY2019Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	575039	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	6767727	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3874310	shares
CY2020Q3	us-gaap	Equity Method Investment Ownership Percentage EquityMethodInvestmentOwnershipPercentage	1
CY2020Q3	us-gaap	Investments Investments	116047000000	USD
CY2020Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1707000000	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	166000000	USD
CY2020Q3	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	10588000000	USD
CY2020Q3	cb	Reinsurance Recoverable Losses And Loss Expenses ReinsuranceRecoverableLossesAndLossExpenses	15670000000	USD
CY2020Q3	cb	Reinsurance Recoverable Future Policy Benefits ReinsuranceRecoverableFuturePolicyBenefits	203000000	USD
CY2020Q3	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	286000000	USD
CY2020Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	21103000000	USD
CY2020Q3	cb	Investments In Subsidiaries To Be Eliminated Upon Consolidation InvestmentsInSubsidiariesToBeEliminatedUponConsolidation	0	USD
CY2020Q3	us-gaap	Due From Affiliates DueFromAffiliates	0	USD
CY2020Q3	cb	Other Assets Condensed OtherAssetsCondensed	22016000000	USD
CY2020Q3	us-gaap	Assets Assets	187786000000	USD
CY2020Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	67905000000	USD
CY2020Q3	us-gaap	Unearned Premiums UnearnedPremiums	17502000000	USD
CY2020Q3	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	5955000000	USD
CY2020Q3	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	0	USD
CY2020Q3	cb	Affiliatednotionalcashpoolingprograms Affiliatednotionalcashpoolingprograms	0	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	1413000000	USD
CY2020Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	1300000000	USD
CY2020Q3	us-gaap	Long Term Debt LongTermDebt	14830000000	USD
CY2020Q3	cb	Trustpreferredsecurities Trustpreferredsecurities	308000000	USD
CY2020Q3	us-gaap	Other Liabilities OtherLiabilities	22160000000	USD
CY2020Q3	us-gaap	Liabilities Liabilities	131373000000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	56413000000	USD
CY2020Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	187786000000	USD
CY2019Q4	us-gaap	Investments Investments	109234000000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1537000000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	109000000	USD
CY2019Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	10357000000	USD
CY2019Q4	cb	Reinsurance Recoverable Losses And Loss Expenses ReinsuranceRecoverableLossesAndLossExpenses	15181000000	USD
CY2019Q4	cb	Reinsurance Recoverable Future Policy Benefits ReinsuranceRecoverableFuturePolicyBenefits	197000000	USD
CY2019Q4	us-gaap	Value Of Business Acquired Voba ValueOfBusinessAcquiredVOBA	306000000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	21359000000	USD
CY2019Q4	cb	Investments In Subsidiaries To Be Eliminated Upon Consolidation InvestmentsInSubsidiariesToBeEliminatedUponConsolidation	0	USD
CY2019Q4	us-gaap	Due From Affiliates DueFromAffiliates	0	USD
CY2019Q4	cb	Other Assets Condensed OtherAssetsCondensed	18663000000	USD
CY2019Q4	us-gaap	Assets Assets	176943000000	USD
CY2019Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	62690000000	USD
CY2019Q4	us-gaap	Unearned Premiums UnearnedPremiums	16771000000	USD
CY2019Q4	us-gaap	Liability For Future Policy Benefits LiabilityForFuturePolicyBenefits	5814000000	USD
CY2019Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	0	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	1416000000	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	1299000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	13559000000	USD
CY2019Q4	cb	Trustpreferredsecurities Trustpreferredsecurities	308000000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	19755000000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	121612000000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	55331000000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	176943000000	USD
CY2020Q3	us-gaap	Premiums Written Net PremiumsWrittenNet	9078000000	USD
CY2020Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	8765000000	USD
CY2020Q3	us-gaap	Net Investment Income NetInvestmentIncome	840000000	USD
CY2020Q3	cb	Equity In Earnings Of Subsidiaries EquityInEarningsOfSubsidiaries	0	USD
CY2020Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-141000000	USD
CY2020Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5835000000	USD
CY2020Q3	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	198000000	USD
CY2020Q3	cb	Policy Acquisition Costs And Administrative Expenses PolicyAcquisitionCostsAndAdministrativeExpenses	2378000000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-130000000	USD
CY2020Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	485000000	USD
CY2020Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	72000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	142000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	1194000000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1952000000	USD
CY2019Q3	us-gaap	Premiums Written Net PremiumsWrittenNet	8622000000	USD
CY2019Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	8327000000	USD
CY2019Q3	us-gaap	Net Investment Income NetInvestmentIncome	873000000	USD
CY2019Q3	cb	Equity In Earnings Of Subsidiaries EquityInEarningsOfSubsidiaries	0	USD
CY2019Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-155000000	USD
CY2019Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	5052000000	USD
CY2019Q3	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	158000000	USD
CY2019Q3	cb	Policy Acquisition Costs And Administrative Expenses PolicyAcquisitionCostsAndAdministrativeExpenses	2355000000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-138000000	USD
CY2019Q3	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	57000000	USD
CY2019Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	76000000	USD
CY2019Q3	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	2000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	230000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	1091000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1473000000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	25410000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	24687000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	2528000000	USD
	cb	Equity In Earnings Of Subsidiaries EquityInEarningsOfSubsidiaries	0	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-1069000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	16897000000	USD
	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	550000000	USD
	cb	Policy Acquisition Costs And Administrative Expenses PolicyAcquisitionCostsAndAdministrativeExpenses	7054000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-390000000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	372000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	217000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	295000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	1115000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2352000000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	24278000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	23355000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	2568000000	USD
	cb	Equity In Earnings Of Subsidiaries EquityInEarningsOfSubsidiaries	0	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-475000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	13865000000	USD
	us-gaap	Liability For Future Policy Benefits Period Expense LiabilityForFuturePolicyBenefitsPeriodExpense	515000000	USD
	cb	Policy Acquisition Costs And Administrative Expenses PolicyAcquisitionCostsAndAdministrativeExpenses	6831000000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	-418000000	USD
	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	326000000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	229000000	USD
	us-gaap	Business Combination Integration Related Costs BusinessCombinationIntegrationRelatedCosts	9000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	626000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	3281000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	6250000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	7241000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	20793000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	42000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	3622000000	USD
	cb	Proceeds From Sale Of Available For Sale Securities Debt Condensed ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed	9537000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	1526000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	8709000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	841000000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	434000000	USD
	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	74000000	USD
	us-gaap	Payments To Acquire Limited Partnership Interests PaymentsToAcquireLimitedPartnershipInterests	1056000000	USD
	us-gaap	Proceeds From Limited Partnership Investments ProceedsFromLimitedPartnershipInvestments	588000000	USD
	us-gaap	Payments For Other Deposits PaymentsForOtherDeposits	503000000	USD
	cb	Portiononeofpaymentstoacquire22.4of Huatai Group Portiononeofpaymentstoacquire22.4ofHuataiGroup	1054000000	USD
	cb	Payment Of Contributions To Subsidiary PaymentOfContributionsToSubsidiary	0	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	352000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6729000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1035000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	333000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	988000000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	1402000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	1402000000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	77000000	USD
	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	0	USD
	cb	Advances To From Affiliates Financing Activities AdvancesToFromAffiliatesFinancingActivities	0	USD
	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
	cb	Net Proceeds From Payments To Affiliated Notional Cash Pooling Program NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram	0	USD
	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	322000000	USD
	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	253000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-234000000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-51000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	227000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1646000000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1873000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4913000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	19778000000	USD
	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	143000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Equity PaymentsToAcquireAvailableForSaleSecuritiesEquity	466000000	USD
	cb	Proceeds From Sale Of Available For Sale Securities Debt Condensed ProceedsFromSaleOfAvailableForSaleSecuritiesDebtCondensed	10436000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Equity ProceedsFromSaleOfAvailableForSaleSecuritiesEquity	577000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	6390000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	814000000	USD
	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-202000000	USD
	us-gaap	Payments For Proceeds From Derivative Instrument Investing Activities PaymentsForProceedsFromDerivativeInstrumentInvestingActivities	647000000	USD
	us-gaap	Payments To Acquire Limited Partnership Interests PaymentsToAcquireLimitedPartnershipInterests	1093000000	USD
	us-gaap	Proceeds From Limited Partnership Investments ProceedsFromLimitedPartnershipInvestments	973000000	USD
	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	329000000	USD
	cb	Payment Of Contributions To Subsidiary PaymentOfContributionsToSubsidiary	0	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	497000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3561000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	1014000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1203000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1286000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	501000000	USD
	us-gaap	Proceeds From Payments For In Securities Sold Under Agreements To Repurchase ProceedsFromPaymentsForInSecuritiesSoldUnderAgreementsToRepurchase	2394000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	2396000000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	155000000	USD
	us-gaap	Cash Dividends Paid To Parent Company CashDividendsPaidToParentCompany	0	USD
	cb	Advances To From Affiliates Financing Activities AdvancesToFromAffiliatesFinancingActivities	0	USD
	us-gaap	Proceeds From Contributions From Parent ProceedsFromContributionsFromParent	0	USD
	cb	Net Proceeds From Payments To Affiliated Notional Cash Pooling Program NetProceedsFromPaymentsToAffiliatedNotionalCashPoolingProgram	0	USD
	us-gaap	Additions To Contract Holders Funds AdditionsToContractHoldersFunds	376000000	USD
	us-gaap	Withdrawal From Contract Holders Funds WithdrawalFromContractHoldersFunds	221000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1124000000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	21000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	249000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1340000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1589000000	USD

Files In Submission

Name	View Source	Status
0000896159-20-000014-index-headers.html	Edgar Link	pending
0000896159-20-000014-index.html	Edgar Link	pending
0000896159-20-000014.txt	Edgar Link	pending
0000896159-20-000014-xbrl.zip	Edgar Link	pending
cb-20200930.htm	Edgar Link	pending
cb-20200930.xsd	Edgar Link	pending
cb-20200930_cal.xml	Edgar Link	unprocessable
cb-20200930_def.xml	Edgar Link	unprocessable
cb-20200930_htm.xml	Edgar Link	completed
cb-20200930_lab.xml	Edgar Link	unprocessable
cb-20200930_pre.xml	Edgar Link	unprocessable
cb-9302020xex311.htm	Edgar Link	pending
cb-9302020xex312.htm	Edgar Link	pending
cb-9302020xex321.htm	Edgar Link	pending
cb-9302020xex322.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$CB
Chubb Ltd Stock $cb

2020 Q4 Form 10-Q Financial Statement

#000089615920000014 Filed on October 30, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CB Chubb Ltd Stock $cb

2020 Q4 Form 10-Q Financial Statement

#000089615920000014 Filed on October 30, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CB
Chubb Ltd Stock $cb