$AMBC
AMBAC FINANCIAL GROUP INC Stock $ambc

$ambc Overview Financials Valuation SEC Filings Company Website

2012 Q4 Form 10-K Financial Statement

#000119312513122346 Filed on March 22, 2013

Income Statement

Concept	2012 Q4	2012	2011 Q4
Revenue	$171.7M	$685.7M	-$30.30M
YoY Change	-666.67%	131.84%	-114.9%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$800.0K	$25.47M	$800.0K
YoY Change	0.0%	19.4%	-11.11%
% of Gross Profit
Operating Expenses	-$1.100M	$822.6M	$839.1M
YoY Change	-100.13%	-58.89%	319.76%
Operating Profit
YoY Change
Interest Expense	-$23.40M	-$112.3M	-$33.10M
YoY Change	-29.31%	-12.33%	-18.27%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$145.4M	-$256.5M	-$963.7M
YoY Change	-115.09%	-86.38%	1083.91%
Income Tax	$2.100M	$2.849M	-$500.0K
% Of Pretax Income	1.44%
Net Earnings	$143.6M	-$256.7M	-$963.2M
YoY Change	-114.91%	-86.91%	1080.39%
Net Earnings / Revenue	83.63%	-37.43%
Basic Earnings Per Share		-$0.85
Diluted Earnings Per Share	$474.6K	-$0.85	-$3.184M
COMMON SHARES
Basic Shares Outstanding	302.4M shares	302.5M shares
Diluted Shares Outstanding		302.5M shares

Balance Sheet

Concept	2012 Q4	2012	2011 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$43.84M	$44.00M	$16.00M
Short-Term Investments
Other Short-Term Assets	$178.0M		$221.0M
YoY Change	-19.46%		-16.6%
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets	$179.0M		$259.0M
YoY Change	-30.89%		-10.38%
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$24.17B	$24.17B	$23.43B
YoY Change	3.18%	3.18%	-5.49%
Other Assets	$2.000M	$2.000M	$5.000M
YoY Change	-60.0%	-60.0%	0.0%
Total Long-Term Assets	$26.91B		$26.85B
YoY Change	0.19%		-6.62%
TOTAL ASSETS
Total Short-Term Assets	$179.0M		$259.0M
Total Long-Term Assets	$26.91B		$26.85B
Total Assets	$27.09B	$27.09B	$27.11B
YoY Change	-0.1%	-0.11%	-6.66%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$232.0M	$232.0M	$174.0M
YoY Change	33.33%	33.33%	167.69%
Deferred Revenue
YoY Change
Short-Term Debt	$531.0M	$0.00	$415.0M
YoY Change	27.95%	-100.0%	18.91%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$1.222B	$691.0M	$1.233B
YoY Change	-0.89%	-43.96%	-0.72%
LONG-TERM LIABILITIES
Long-Term Debt	$15.59B	$15.59B	$14.51B
YoY Change	7.4%	7.4%	-11.02%
Other Long-Term Liabilities	$4.029B	$4.561B	$3.902B
YoY Change	3.25%	16.89%	14.36%
Total Long-Term Liabilities	$19.62B	$20.15B	$18.41B
YoY Change	6.52%	9.41%	-6.63%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.222B	$691.0M	$1.233B
Total Long-Term Liabilities	$19.62B	$20.15B	$18.41B
Total Liabilities	$30.33B	$30.99B	$30.26B
YoY Change	0.23%	0.21%	-2.55%
SHAREHOLDERS EQUITY
Retained Earnings	-$6.297B		-$6.040B
YoY Change	4.26%
Common Stock	$3.080M		$3.080M
YoY Change	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$410.8M		$411.4M
YoY Change	-0.16%
Treasury Stock Shares	5.581M shares		5.588M shares
Shareholders Equity	-$3.908B	-$3.908B	-$3.813B
YoY Change
Total Liabilities & Shareholders Equity	$27.09B	$27.09B	$27.11B
YoY Change	-0.1%	-0.11%	-6.66%

Cashflow Statement

Concept	2012 Q4	2012	2011 Q4
OPERATING ACTIVITIES
Net Income	$143.6M	-$256.7M	-$963.2M
YoY Change	-114.91%	-86.91%	1080.39%
Depreciation, Depletion And Amortization	$800.0K	$25.47M	$800.0K
YoY Change	0.0%	19.4%	-11.11%
Cash From Operating Activities	-$215.7M	-$613.9M	-$195.3M
YoY Change	10.45%	-17358.87%	-351.03%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	$229.0M	$40.26M	$198.1M
YoY Change	15.6%	-1132.33%	-1021.4%
Cash From Investing Activities	$229.0M	$1.038B	$198.1M
YoY Change	15.6%	355.2%	-1021.4%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net		$188.4M
YoY Change
Cash From Financing Activities	-59.50M	-396.2M	-8.100M
YoY Change	634.57%	76.05%	-93.05%
NET CHANGE
Cash From Operating Activities	-215.7M	-613.9M	-195.3M
Cash From Investing Activities	229.0M	1.038B	198.1M
Cash From Financing Activities	-59.50M	-396.2M	-8.100M
Net Change In Cash	-46.20M	27.84M	-5.300M
YoY Change	771.7%	328.15%	-91.21%
FREE CASH FLOW
Cash From Operating Activities	-$215.7M	-$613.9M	-$195.3M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2011Q2	abk	Assessment For Federal Income Taxes AssessmentForFederalIncomeTaxes	807244000
CY2012Q2	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	789179000
CY2012Q2	abk	Aggregate Payment To Repurchase Surplus Notes AggregatePaymentToRepurchaseSurplusNotes	188446000
CY2012Q2	dei	Entity Public Float EntityPublicFloat	8336718
CY2012Q2	us-gaap	Debt Instrument Repurchased Face Amount DebtInstrumentRepurchasedFaceAmount	789179000
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CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23050000
CY2010Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	2422596000
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9497000
CY2010Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	4424450000
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CY2010Q4	abk	Amount Of Loss Carry Forward Relinquish By Which Loss Carry Forward Exceed AmountOfLossCarryForwardRelinquishByWhichLossCarryForwardExceed	3400000000
CY2010Q4	abk	Reduction In Tax Net Operating Losses On Credit Default Contracts ReductionInTaxNetOperatingLossesOnCreditDefaultContracts	3400000000
CY2011Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	5346897000
CY2011Q4	us-gaap	Other Assets OtherAssets	104300000
CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	144320000
CY2011Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3169402000
CY2011Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	47421000
CY2011Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Number Of Contracts Issued And Outstanding ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationNumberOfContractsIssuedAndOutstanding	330	Policies
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CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-3149533000
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	96900000
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	4000000	shares
CY2011Q4	us-gaap	Liability Net For Claims And Claims Adjustment Expense Financial Guarantee Insurance Contracts LiabilityNetForClaimsAndClaimsAdjustmentExpenseFinancialGuaranteeInsuranceContracts	7044070000
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	514150000
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CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	144196000
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	463259000
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CY2011Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	2028479000
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CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-6039922000
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CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	627588000
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CY2011Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstanding	45035585000
CY2011Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Statement Of Financial Position Unearned Premium Revenue ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionUnearnedPremiumRevenue	546520000
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CY2011Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Statement Of Financial Position Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionClaimLiability	6384260000
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CY2011Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	114011000
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CY2011Q4	abk	Estimated Future Premium Payments Weighted Average Discounted Rate EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate	0.084	pure
CY2011Q4	abk	Fair Value Of Securities Deposited With Governmental Authorities FairValueOfSecuritiesDepositedWithGovernmentalAuthorities	7132000
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CY2011Q4	abk	Percentage Of Credit Value Adjustment PercentageOfCreditValueAdjustment	0.75	pure
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Discount On Gross Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationDiscountOnGrossClaimLiability	2279110000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Gross Undiscounted Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossUndiscountedClaimLiability	12511194000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Discount On Other Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityDiscountOnOtherSubrogation	52539000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Other Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityOtherSubrogation	668332000
CY2011Q4	abk	Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses SecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses	114011000
CY2011Q4	abk	Securities Held To Collateralize And Fund Repayment Of Debt Issued Through Resecuritization Transaction Fair Value SecuritiesHeldToCollateralizeAndFundRepaymentOfDebtIssuedThroughResecuritizationTransactionFairValue	172880000
CY2011Q4	abk	Short Term Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses ShortTermSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	30310000
CY2011Q4	abk	Short Term Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value ShortTermSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	641737000
CY2011Q4	abk	Subrogation Recoverable Included In Loss And Loss Expense Reserves SubrogationRecoverableIncludedInLossAndLossExpenseReserves	2559129000
CY2011Q4	abk	Weighted Average Discount Rate Used To Fair Value Options To Repurchase Surplus Notes WeightedAverageDiscountRateUsedToFairValueOptionsToRepurchaseSurplusNotes	0.3657	pure
CY2011Q4	abk	Financial Guarantee Gross Outstanding Principal FinancialGuaranteeGrossOutstandingPrincipal	296463000000
CY2011Q4	abk	Non Credit Other Than Temporary Impairments On Other Investments NonCreditOtherThanTemporaryImpairmentsOnOtherInvestments
CY2011Q4	abk	Restricted Stock Number Outstanding RestrictedStockNumberOutstanding	113739	shares
CY2011Q4	abk	Financial Guarantee Gross Outstanding Principal And Interest FinancialGuaranteeGrossOutstandingPrincipalAndInterest	474305000000
CY2011Q4	abk	Net Financial Guarantee Principal And Interest In Force NetFinancialGuaranteePrincipalAndInterestInForce	433484000000
CY2011Q4	abk	Reserve For Loss Adjustment Expenses ReserveForLossAdjustmentExpenses	86171000
CY2011Q4	abk	Balance Of Gross Rmbs Subrogation Recoveries BalanceOfGrossRmbsSubrogationRecoveries	2720266000
CY2011Q4	abk	Balance Of Rmbs Subrogation Recoveries Net Of Reinsurance BalanceOfRmbsSubrogationRecoveriesNetOfReinsurance	2692414000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Undiscounted Claim Liability Gross Undiscounted Rmbs Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossUndiscountedClaimLiabilityGrossUndiscountedRmbsSubrogation	2778645000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Loss Adjustment Expenses Reserve ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationLossAdjustmentExpensesReserve	87294000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityRmbsSubrogation	2720266000
CY2011Q4	abk	Subrogation Recoverable Asset SubrogationRecoverableAsset	829469000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Discount On Rmbs Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityDiscountOnRmbsSubrogation	58379000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Undiscounted Claim Liability Gross Undiscounted Other Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossUndiscountedClaimLiabilityGrossUndiscountedOtherSubrogation	720871000
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	77715000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than15 And Within20 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan15AndWithin20YearsFromBalanceSheetDate	300682000
CY2011Q4	abk	Change In Loss And Loss Expense Reserves Net ChangeInLossAndLossExpenseReservesNet	1671734000
CY2011Q4	abk	Borrowings Under Guaranteed Investment Agreements And Securities Sold Under Agreements To Repurchase BorrowingsUnderGuaranteedInvestmentAgreementsAndSecuritiesSoldUnderAgreementsToRepurchase	546546000
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0
CY2012Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4751824000
CY2012Q4	us-gaap	Other Assets OtherAssets	39715000
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	565000000
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	41.17
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Rmbs Gross Claim Liabilities Before Subrogation Recoveries ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationRmbsGrossClaimLiabilitiesBeforeSubrogationRecoveries	3777581000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Rmbs Gross Claim Liabilities After Subrogation Recoveries ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationRmbsGrossClaimLiabilitiesAfterSubrogationRecoveries	1057315000
CY2011Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Subrogation Rmbs ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilitySubrogationRmbs	2720266000
CY2011Q4	abk	Pledged Assets Not Separately Reported Investment Securities PledgedAssetsNotSeparatelyReportedInvestmentSecurities	329129000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected During First Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringFirstQuarterFollowingBalanceSheetDate	35559000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than One And Within Two Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate	137580000
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	495000000
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1135469000
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses2	77715000
CY2012Q4	us-gaap	Deferred Income Taxes And Other Liabilities Noncurrent DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent	1586000
CY2012Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3256423000
CY2012Q4	us-gaap	Derivative Collateral Right To Reclaim Cash DerivativeCollateralRightToReclaimCash	5472000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than25 And Within30 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan25AndWithin30YearsFromBalanceSheetDate	44426000
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Number Of Contracts Issued And Outstanding ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationNumberOfContractsIssuedAndOutstanding	316	Policies
CY2012Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	5580657	shares
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	650000000	shares
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than Three And Within Four Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate	169673000
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	1020421000
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	-3246967000
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	96900000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than20 And Within25 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan20AndWithin25YearsFromBalanceSheetDate	156287000
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	4000000	shares
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than Four And Within Five Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate	159999000
CY2012Q4	us-gaap	Liability Net For Claims And Claims Adjustment Expense Financial Guarantee Insurance Contracts LiabilityNetForClaimsAndClaimsAdjustmentExpenseFinancialGuaranteeInsuranceContracts	6619486000
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Loss Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves	522502000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected During Third Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringThirdQuarterFollowingBalanceSheetDate	32926000
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	972316000
CY2012Q4	us-gaap	Derivative Collateral Obligation To Return Cash DerivativeCollateralObligationToReturnCash	0
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	625385000
CY2012Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	302692000
CY2012Q4	us-gaap	Liabilities Subject To Compromise Debt And Accrued Interest LiabilitiesSubjectToCompromiseDebtAndAccruedInterest	1690312000
CY2012Q4	us-gaap	Assets Assets	27007164000
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	728286000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than15 And Within20 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan15AndWithin20YearsFromBalanceSheetDate	306473000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	1620621000
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	151067000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than Five And Within10 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFiveAndWithin10YearsFromBalanceSheetDate	540832000
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-6297264000
CY2012Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	0
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	455626000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than30 And Within35 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan30AndWithin35YearsFromBalanceSheetDate	15142000
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	43837000
CY2012Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	453214000
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Principal ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingPrincipal	24060370000
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	7184000
CY2012Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	39742000
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-1586000
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstanding	33303553000
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than Four And Within Five Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFourAndWithinFiveYearsFromBalanceSheetDate	121879000
CY2012Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.0897	pure
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than Three And Within Four Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanThreeAndWithinFourYearsFromBalanceSheetDate	127268000
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Statement Of Financial Position Unearned Premium Revenue ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionUnearnedPremiumRevenue	603794000
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Interest ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationInsuredContractualPaymentsOutstandingInterest	9243183000
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.17
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Statement Of Financial Position Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionClaimLiability	6122140000
CY2012Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	6398000000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than30 And Within35 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan30AndWithin35YearsFromBalanceSheetDate	15266000
CY2012Q4	us-gaap	Minority Interest MinorityInterest	660560000
CY2012Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	271251000
CY2012Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	180113000
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	1071294000
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	1070411000
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses2	70164000
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	602775	shares
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	149481000
CY2012Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	1620621000
CY2012Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	5926000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized During First Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFirstQuarterFollowingBalanceSheetDate	58837000
CY2012Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	261203000
CY2012Q4	us-gaap	Accrued Income Taxes Current AccruedIncomeTaxesCurrent	96778000
CY2012Q4	us-gaap	Loans Receivable Net LoansReceivableNet	9203000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized During Fourth Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringFourthQuarterFollowingBalanceSheetDate	51675000
CY2012Q4	us-gaap	Reinsurance Recoverables ReinsuranceRecoverables	159086000
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	2857926000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized During Third Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringThirdQuarterFollowingBalanceSheetDate	53603000
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Gross Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossClaimLiability	9981831000
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	27007164000
CY2012Q4	us-gaap	Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate	0.0400	pure
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	308016764	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	70530	shares
CY2012Q4	us-gaap	Borrowings Under Guaranteed Investment Agreements BorrowingsUnderGuaranteedInvestmentAgreements	356091000
CY2012Q4	us-gaap	Income Tax Examination Interest Accrued IncomeTaxExaminationInterestAccrued	0
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognized	2600508000
CY2012Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	199160000
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	3080000
CY2012Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	3405904000
CY2012Q4	us-gaap	Derivative Liability Fair Value Net1 DerivativeLiabilityFairValueNet1	-62854000
CY2012Q4	us-gaap	Notional Amount Of Credit Risk Derivatives NotionalAmountOfCreditRiskDerivatives	11281777000
CY2012Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	6122140000
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	602775	shares
CY2012Q4	us-gaap	Debt Instrument Interest Rate Stated Percentage DebtInstrumentInterestRateStatedPercentage	0.0665	pure
CY2012Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	228835000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected During Second Quarter Following The Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringSecondQuarterFollowingTheBalanceSheetDate	34183000
CY2012Q4	us-gaap	Statutory Accounting Practices Statutory Capital And Surplus Required StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired	100000000
CY2012Q4	us-gaap	Derivative Number Of Instruments Held DerivativeNumberOfInstrumentsHeld	51	Transactions
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	5142000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than25 And Within30 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan25AndWithin30YearsFromBalanceSheetDate	51660000
CY2012Q4	us-gaap	Investment Related Liabilities InvestmentRelatedLiabilities	25000
CY2012Q4	us-gaap	Equity Method Investments Fair Value Disclosure EquityMethodInvestmentsFairValueDisclosure	14557000
CY2012Q4	us-gaap	Liabilities Liabilities	30254131000
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	855714000
CY2012Q4	us-gaap	Derivative Assets DerivativeAssets	48005000
CY2012Q4	us-gaap	Investments Investments	6329932000
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	150170000
CY2012Q4	us-gaap	Other Liabilities OtherLiabilities	102488000
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	189597000
CY2012Q4	us-gaap	Cash Cash	43837000
CY2012Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	14588000
CY2012Q4	us-gaap	Liabilities Subject To Compromise Other Liabilities LiabilitiesSubjectToCompromiseOtherLiabilities	14592000
CY2012Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	5974731000
CY2012Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Fair Value SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesFairValue	6329932000
CY2012Q4	us-gaap	Ceded Premiums Payable CededPremiumsPayable	94527000
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	576268000
CY2012Q4	us-gaap	Pledged Assets Not Separately Reported Other Financial Instruments PledgedAssetsNotSeparatelyReportedOtherFinancialInstruments	201329000
CY2012Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	17841863000
CY2012Q4	us-gaap	Availableforsale Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses2 AvailableforsaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses2	7551000
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	682874000
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	5188000
CY2012Q4	us-gaap	Participating Policies Amount In Force ParticipatingPoliciesAmountInForce	223633000000
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5687000
CY2012Q4	us-gaap	Liabilities Subject To Compromise LiabilitiesSubjectToCompromise	1704904000
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	410755000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than Two And Within Three Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate	132688000
CY2012Q4	us-gaap	Reinsurance Payable ReinsurancePayable	94527000
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1013742000
CY2012Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	57262000
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	618000000
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	5215000
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	213585000
CY2012Q4	us-gaap	Other Investments OtherInvestments	100000
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	857197000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than Five And Within10 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFiveAndWithin10YearsFromBalanceSheetDate	670854000
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Statement Of Financial Position Reinsurance Recoverable ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationStatementOfFinancialPositionReinsuranceRecoverable	159086000
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	308016764	shares
CY2012Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	17661700000
CY2012Q4	us-gaap	Available For Sale Securities Pledged As Collateral AvailableForSaleSecuritiesPledgedAsCollateral	265779000
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	637000000
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	15545000
CY2012Q4	us-gaap	Other Receivables OtherReceivables	761000
CY2012Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	2172027000
CY2012Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Cost SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCost	5678660000
CY2012Q4	us-gaap	Summary Of Investments Other Than Investments In Related Parties Carrying Amount SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesCarryingAmount	6329932000
CY2012Q4	us-gaap	Schedule Of Insured Financial Obligations With Credit Deterioration Net Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationNetClaimLiability	6587826000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than35 And Within40 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan35AndWithin40YearsFromBalanceSheetDate	3642000
CY2012Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	0
CY2012Q4	us-gaap	Other Short Term Investments OtherShortTermInvestments	661658000
CY2012Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	5402395000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized During Second Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedDuringSecondQuarterFollowingBalanceSheetDate	56236000
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected During Fourth Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedDuringFourthQuarterFollowingBalanceSheetDate	32241000
CY2012Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	17251000
CY2012Q4	us-gaap	Unearned Premiums UnearnedPremiums	2778401000
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	492000000
CY2012Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	227248000
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	660050000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than10 And Within15 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan10AndWithin15YearsFromBalanceSheetDate	424888000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than One And Within Two Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanOneAndWithinTwoYearsFromBalanceSheetDate	193964000
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	-3907527000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than35 And Within40 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan35AndWithin40YearsFromBalanceSheetDate	4695000
CY2012Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than Two And Within Three Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanTwoAndWithinThreeYearsFromBalanceSheetDate	179782000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Premium Expected To Be Collected FinancialGuaranteeInsuranceContractsPremiumReceivablePremiumExpectedToBeCollected	2146907000
CY2012Q4	us-gaap	Prepaid Reinsurance Premiums PrepaidReinsurancePremiums	177893000
CY2012Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	183300000
CY2012Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	497346000
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than10 And Within15 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThan10AndWithin15YearsFromBalanceSheetDate	478565000
CY2012Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than20 And Within25 Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThan20AndWithin25YearsFromBalanceSheetDate	155521000
CY2012Q4	us-gaap	Notes Receivable Net NotesReceivableNet	9203000
CY2012Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	3591000000
CY2012Q4	abk	Deferred Tax Liabilities Unearned Premium Revenue DeferredTaxLiabilitiesUnearnedPremiumRevenue	54539000
CY2012Q4	abk	Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value SecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	455626000
CY2012Q4	abk	Securities Continuous Unrealized Loss Position Fair Value SecuritiesContinuousUnrealizedLossPositionFairValue	684068000
CY2012Q4	abk	Average Annual Rate Of Return AverageAnnualRateOfReturn	0.0801	pure
CY2012Q4	abk	Change In Beneficial Ownership Percentage ChangeInBeneficialOwnershipPercentage	0.045	pure
CY2012Q4	abk	Unpaid Principal Amount Of Fixed Rate Debt Accounted For Under Fair Value Option UnpaidPrincipalAmountOfFixedRateDebtAccountedForUnderFairValueOption	15684925000
CY2012Q4	abk	Current Liabilities Variable Interest Entity CurrentLiabilitiesVariableInterestEntity	22015000
CY2012Q4	abk	Beneficial Ownership Of Company Common Stock Held By External Investor Shares BeneficialOwnershipOfCompanyCommonStockHeldByExternalInvestorShares	13500000	shares
CY2012Q4	abk	Unrealized Gain Investments UnrealizedGainInvestments	12605000
CY2012Q4	abk	Subrogation Recoverable SubrogationRecoverable	497346000
CY2012Q4	abk	Other Short Term Investments Amortized Cost OtherShortTermInvestmentsAmortizedCost	661219000
CY2012Q4	abk	Shares Available For Future Grants SharesAvailableForFutureGrants	16032551	shares
CY2012Q4	abk	Other Investments Unrealized Gain Loss OtherInvestmentsUnrealizedGainLoss
CY2012Q4	abk	Amortized Cost On Investment AmortizedCostOnInvestment	5678660000
CY2012Q4	abk	Assets Segment AssetsSegment	27007164000
CY2012Q4	abk	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses By Closed Block Life Insurance AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLossesByClosedBlockLifeInsurance	3548000
CY2012Q4	abk	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses By Issuance By Large Diversified Financial Services AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLossesByIssuanceByLargeDiversifiedFinancialServices	3363000
CY2012Q4	abk	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses Related To Alta AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLossesRelatedToAlta	15236000
CY2012Q4	abk	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses Related To Alta Number AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLossesRelatedToAltaNumber	16	Security
CY2012Q4	abk	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses Related To Alta Percentage AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLossesRelatedToAltaPercentage	1.00	pure
CY2012Q4	abk	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses Secured By Lease Payments AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLossesSecuredByLeasePayments	29838000
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	228026000
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	1991000
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	302439299	shares
CY2011	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-208496000
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	2442000
CY2011	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	141305000
CY2011	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	-507174000
CY2011	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-28873000
CY2012Q4	abk	Available For Sale Securities Debt Maturities With Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateAmortizedCost	3862193000
CY2012Q4	abk	Available For Sale Securities Debt Maturities With Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithMaturityDateFairValue	4134371000
CY2012Q4	abk	Available For Sale Securities Pledged As Collateral Amortized Cost Basis AvailableForSaleSecuritiesPledgedAsCollateralAmortizedCostBasis	265517000
CY2012Q4	abk	Available For Sale Securities Pledged As Collateral Gross Unrealized Gain AvailableForSaleSecuritiesPledgedAsCollateralGrossUnrealizedGain	262000
CY2012Q4	abk	Available For Sale Securities Pledged As Collateral Gross Unrealized Losses AvailableForSaleSecuritiesPledgedAsCollateralGrossUnrealizedLosses
CY2012Q4	abk	Estimated Future Premium Payments Weighted Average Discounted Rate EstimatedFuturePremiumPaymentsWeightedAverageDiscountedRate	0.076	pure
CY2012Q4	abk	Fair Value Input Weighted Average Credit Derivative Quote As Percentage Of Notional FairValueInputWeightedAverageCreditDerivativeQuoteAsPercentageOfNotional	0.10	pure
CY2012Q4	abk	Fair Value Input Weighted Average Credit Rating FairValueInputWeightedAverageCreditRating	A
CY2012Q4	abk	Fair Value Input Weighted Average Life FairValueInputWeightedAverageLife	P7Y10M24D
CY2012Q4	abk	Fair Value Of Securities Deposited With Governmental Authorities FairValueOfSecuritiesDepositedWithGovernmentalAuthorities	6945000
CY2012Q4	abk	Gross Unrealized Gains On Investment GrossUnrealizedGainsOnInvestment	728987000
CY2012Q4	abk	Gross Unrealized Loss On Investment GrossUnrealizedLossOnInvestment	77715000
CY2012Q4	abk	Investment Other Than Available For Sale Securities Pledged As Collateral InvestmentOtherThanAvailableForSaleSecuritiesPledgedAsCollateral	6064153000
CY2012Q4	abk	Investment Other Than Available For Sale Securities Pledged As Collateral Amortized Cost Basis InvestmentOtherThanAvailableForSaleSecuritiesPledgedAsCollateralAmortizedCostBasis	5413143000
CY2012Q4	abk	Investment Other Than Available For Sale Securities Pledged As Collateral Gross Unrealized Gain InvestmentOtherThanAvailableForSaleSecuritiesPledgedAsCollateralGrossUnrealizedGain	728725000
CY2012Q4	abk	Investment Other Than Available For Sale Securities Pledged As Collateral Gross Unrealized Losses InvestmentOtherThanAvailableForSaleSecuritiesPledgedAsCollateralGrossUnrealizedLosses	77715000
CY2012Q4	abk	Liabilities Subject To Compromise Including Subsidiaries Liability LiabilitiesSubjectToCompromiseIncludingSubsidiariesLiability	1704939000
CY2012Q4	abk	Liabilities Subject To Compromise Payable To Non Debtor Subsidiaries LiabilitiesSubjectToCompromisePayableToNonDebtorSubsidiaries	35000
CY2012Q4	abk	Loss Reserves Ceded To Reinsurers LossReservesCededToReinsurers	147409000
CY2012Q4	abk	Non Credit Other Than Temporary Impairments On Investments NonCreditOtherThanTemporaryImpairmentsOnInvestments	6892000
CY2012Q4	abk	Number Of Remediation Transactions NumberOfRemediationTransactions	49	Transactions
CY2012Q4	abk	Other Investments Amortized Cost Basis OtherInvestmentsAmortizedCostBasis	100000
CY2012Q4	abk	Parent Company Cash And Short Term Investments ParentCompanyCashAndShortTermInvestments	30357000
CY2012Q4	abk	Payment By Subsidiary To Internal Revenue Service Associated With Net Operating Loss Usage Tier C Under Amended Tax Sharing Agreement PaymentBySubsidiaryToInternalRevenueServiceAssociatedWithNetOperatingLossUsageTierCUnderAmendedTaxSharingAgreement	0.125	pure
CY2012Q4	abk	Payment By Subsidiary To Internal Revenue Service Associated With Net Operating Loss Usage Tier D Under Amended Tax Sharing Agreement PaymentBySubsidiaryToInternalRevenueServiceAssociatedWithNetOperatingLossUsageTierDUnderAmendedTaxSharingAgreement	0.175	pure
CY2012Q4	abk	Percentage Of Credit Value Adjustment PercentageOfCreditValueAdjustment	0.55	pure
CY2012Q4	abk	Reduction In Tax Net Operating Losses On Credit Default Contracts ReductionInTaxNetOperatingLossesOnCreditDefaultContracts	3400000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Discount On Gross Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationDiscountOnGrossClaimLiability	2138631000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Gross Undiscounted Claim Liability ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationGrossUndiscountedClaimLiability	12120462000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Discount On Other Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityDiscountOnOtherSubrogation	36949000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Other Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityOtherSubrogation	870780000
CY2012Q4	abk	Securities Continuous Unrealized Loss Position Twelve Months Or Longer Aggregate Losses SecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAggregateLosses	70164000
CY2012Q4	abk	Securities Held To Collateralize And Fund Repayment Of Debt Issued Through Resecuritization Transaction Fair Value SecuritiesHeldToCollateralizeAndFundRepaymentOfDebtIssuedThroughResecuritizationTransactionFairValue	201329000
CY2012Q4	abk	Short Term Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses ShortTermSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAggregateLosses	7551000
CY2012Q4	abk	Short Term Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value ShortTermSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	228242000
CY2012Q4	abk	Subrogation Recoverable Included In Loss And Loss Expense Reserves SubrogationRecoverableIncludedInLossAndLossExpenseReserves	2611430000
CY2012Q4	abk	Financial Guarantee Gross Outstanding Principal FinancialGuaranteeGrossOutstandingPrincipal	245030000000
CY2012Q4	abk	Percentage Of Highest Single Insured Risk Of Aggregate Net Par Amount Guaranteed PercentageOfHighestSingleInsuredRiskOfAggregateNetParAmountGuaranteed	0.013	pure
CY2012Q4	abk	Non Credit Other Than Temporary Impairments On Other Investments NonCreditOtherThanTemporaryImpairmentsOnOtherInvestments
CY2012Q4	abk	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Restricted Stock Units Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRestrictedStockUnitsNumber	104389	shares
CY2012Q4	abk	Restricted Stock Number Outstanding RestrictedStockNumberOutstanding	104389	shares
CY2011	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	93000
CY2012Q4	abk	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Restricted Stock Units Vested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsRestrictedStockUnitsVestedNumber	33859	shares
CY2012Q4	abk	Financial Guarantee Gross Outstanding Principal And Interest FinancialGuaranteeGrossOutstandingPrincipalAndInterest	385803000000
CY2012Q4	abk	Net Financial Guarantee Principal And Interest In Force NetFinancialGuaranteePrincipalAndInterestInForce	350163000000
CY2012Q4	abk	Secured Note Outstanding SecuredNoteOutstanding	470498000
CY2012Q4	abk	Insurance Liabilities Allocated To Segregated Account InsuranceLiabilitiesAllocatedToSegregatedAccount	6245484000
CY2012Q4	abk	Surplus Notes Issued In Settlement Of Claim Liabilities SurplusNotesIssuedInSettlementOfClaimLiabilities	53000000
CY2012Q4	abk	Financial Guarantee Insurance Contracts Premium Expected To Be Collected More Than Forty And Within Forty Five Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsPremiumExpectedToBeCollectedMoreThanFortyAndWithinFortyFiveYearsFromBalanceSheetDate	92000
CY2012Q4	abk	Financial Guarantee Insurance Contracts Future Expected Premium Revenue To Be Recognized More Than Forty And Within Forty Five Years From Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedPremiumRevenueToBeRecognizedMoreThanFortyAndWithinFortyFiveYearsFromBalanceSheetDate	297000
CY2012Q4	abk	Liabilities Subject To Compromise Not Recognized In Balance Sheet LiabilitiesSubjectToCompromiseNotRecognizedInBalanceSheet	211896000
CY2012Q4	abk	Reserve For Loss Adjustment Expenses ReserveForLossAdjustmentExpenses	136790000
CY2012Q4	abk	Balance Of Gross Rmbs Subrogation Recoveries BalanceOfGrossRmbsSubrogationRecoveries	2523225000
CY2012Q4	abk	Balance Of Rmbs Subrogation Recoveries Net Of Reinsurance BalanceOfRmbsSubrogationRecoveriesNetOfReinsurance	2497233000
CY2012Q4	abk	Financial Guarantee Outstanding Principal Ceded To Third Parties FinancialGuaranteeOutstandingPrincipalCededToThirdParties	21396732000
CY2012Q4	abk	Deferred Ceded Premiums And Reinsurance Recoverables DeferredCededPremiumsAndReinsuranceRecoverables	326365000
CY2012Q4	abk	Financial Guarantee Gross Outstanding Principal Assumed From Third Parties FinancialGuaranteeGrossOutstandingPrincipalAssumedFromThirdParties	235471000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Undiscounted Claim Liability Gross Undiscounted Rmbs Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossUndiscountedClaimLiabilityGrossUndiscountedRmbsSubrogation	2561163000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Discount On Rmbs Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityDiscountOnRmbsSubrogation	37938000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Undiscounted Claim Liability Gross Undiscounted Other Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossUndiscountedClaimLiabilityGrossUndiscountedOtherSubrogation	907729000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Loss Adjustment Expenses Reserve ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationLossAdjustmentExpensesReserve	138108000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilityRmbsSubrogation	2523225000
CY2012Q4	abk	Subrogation Recoverable Asset SubrogationRecoverableAsset	782575000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Rmbs Gross Claim Liabilities Before Subrogation Recoveries ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationRmbsGrossClaimLiabilitiesBeforeSubrogationRecoveries	3563344000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Rmbs Gross Claim Liabilities After Subrogation Recoveries ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationRmbsGrossClaimLiabilitiesAfterSubrogationRecoveries	1040119000
CY2012Q4	abk	Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Subrogation Rmbs ScheduleOfInsuredFinancialObligationsWithCreditDeteriorationReductionsOfGrossClaimLiabilitySubrogationRmbs	2523225000
CY2012Q4	abk	Unsecured Reinsurance Recoverables UnsecuredReinsuranceRecoverables	13370000
CY2012Q4	abk	Investment Agreement Expected Repayments Of Principal InvestmentAgreementExpectedRepaymentsOfPrincipal	362104000
CY2012Q4	abk	Debt Instrument Principal Amount Subject To Repurchase DebtInstrumentPrincipalAmountSubjectToRepurchase	939179000
CY2012Q4	abk	Pledged Assets Not Separately Reported Investment Securities PledgedAssetsNotSeparatelyReportedInvestmentSecurities	266848000
CY2012Q4	abk	Maximum Ownership Of Debt Securities By Holder MaximumOwnershipOfDebtSecuritiesByHolder	56930000
CY2012Q4	abk	Amount Of Insured Par Outstanding Ceded To Reinsurer AmountOfInsuredParOutstandingCededToReinsurer	18779685000
CY2012Q4	abk	Change In Loss And Loss Expense Reserves Net ChangeInLossAndLossExpenseReservesNet	-256049000
CY2012Q4	abk	Borrowings Under Guaranteed Investment Agreements And Securities Sold Under Agreements To Repurchase BorrowingsUnderGuaranteedInvestmentAgreementsAndSecuritiesSoldUnderAgreementsToRepurchase	362017000
CY2011Q2	abk	Junior Surplus Notes Par Value JuniorSurplusNotesParValue	36082000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	60249000
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	179440000
CY2011	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-1057628000
CY2011	us-gaap	Ceded Premiums Earned Financial Guarantee Insurance Contracts CededPremiumsEarnedFinancialGuaranteeInsuranceContracts	22718000
CY2011	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	19872000
CY2011	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	-394117000
CY2011	us-gaap	Increase Decrease In Loss And Loss Adjustment Expense Reserve IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	1786959000
CY2011	us-gaap	Profit Loss ProfitLoss	-1960371000
CY2011	us-gaap	Other Income OtherIncome	25535000
CY2011	us-gaap	Investment Income Net InvestmentIncomeNet	358207000
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.041	pure
CY2011	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	35000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Premium Payments Received FinancialGuaranteeInsuranceContractsPremiumReceivablePremiumPaymentsReceived	190823000
CY2011	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1528000
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1882949000
CY2011	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	77422000
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	47000
CY2011	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	42508000
CY2011	us-gaap	Premiums Earned Net PremiumsEarnedNet	405970000
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.364	pure
CY2011	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	57446000
CY2011	us-gaap	Contractual Interest Expense On Prepetition Liabilities Not Recognized In Statement Of Operations ContractualInterestExpenseOnPrepetitionLiabilitiesNotRecognizedInStatementOfOperations	110093000
CY2011	us-gaap	Income Tax Examination Interest Expense IncomeTaxExaminationInterestExpense	0
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	-15459000
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002	pure
CY2011	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	48032000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Premium Received Over Contract Period Premium Receivable Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodPremiumReceivableWeightedAverageRiskFreeDiscountRate	0.026	pure
CY2011	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	-27139000
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	6502000
CY2011	us-gaap	Assumed Premiums Earned Financial Guarantee Insurance Contracts AssumedPremiumsEarnedFinancialGuaranteeInsuranceContracts	-345000
CY2011	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	-753000
CY2011	us-gaap	Debt Instrument Interest Rate Effective Percentage Rate Range Minimum DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum	0.0040	pure
CY2011	us-gaap	Debtor Reorganization Items Other Expense Income DebtorReorganizationItemsOtherExpenseIncome	44000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Other Adjustments FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentOtherAdjustments	-8830000
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	6980000
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	-0.039	pure
CY2011	us-gaap	Insured Financial Obligations With Credit Deterioration Remaining Weighted Average Contract Period InsuredFinancialObligationsWithCreditDeteriorationRemainingWeightedAverageContractPeriod	P13Y
CY2011	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	635178000
CY2011	us-gaap	Reorganization Items ReorganizationItems	49861000
CY2011	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	-2292000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-240547000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.018	pure
CY2011	us-gaap	Incurred Claims Financial Guarantee Insurance Contracts IncurredClaimsFinancialGuaranteeInsuranceContracts	1859455000
CY2011	us-gaap	Assumed Premiums Written Financial Guarantee Insurance Contracts AssumedPremiumsWrittenFinancialGuaranteeInsuranceContracts	7670000
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	171532000
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-6.48
CY2011	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	186314000
CY2011	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3733000
CY2011	us-gaap	Debtor Reorganization Items Write Off Of Deferred Financing Costs And Debt Discounts DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts	32000
CY2011	us-gaap	Increase Decrease In Cash Collateral For Borrowed Securities IncreaseDecreaseInCashCollateralForBorrowedSecurities	2440000
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-225081000
CY2011	us-gaap	Net Income Loss NetIncomeLoss	-1960431000
CY2011	us-gaap	Direct Premiums Written Financial Guarantee Insurance Contracts DirectPremiumsWrittenFinancialGuaranteeInsuranceContracts	171283000
CY2011	us-gaap	Net Investment Income NetInvestmentIncome	354796000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Premium Received Over Contract Period Premium Receivable Weighted Average Collection Period1 FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodPremiumReceivableWeightedAverageCollectionPeriod1	P10Y
CY2011	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	3411000
CY2011	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	-45380000
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-6.48
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
CY2011	us-gaap	Ceded Premiums Written Financial Guarantee Insurance Contracts CededPremiumsWrittenFinancialGuaranteeInsuranceContracts	20835000
CY2011	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	262000
CY2011	us-gaap	Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense Amount CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAmount	1180240000
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	302439299	shares
CY2011	us-gaap	Direct Premiums Earned Financial Guarantee Insurance Contracts DirectPremiumsEarnedFinancialGuaranteeInsuranceContracts	429033000
CY2011	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	685787000
CY2011	us-gaap	Derivative Average Remaining Maturity1 DerivativeAverageRemainingMaturity1	P4Y1M6D
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	21590000
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.011	pure
CY2011	us-gaap	Debtor Reorganization Items Legal And Advisory Professional Fees DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees	35778000
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-1788946000
CY2011	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	675932000
CY2011	us-gaap	Gain Loss On Derivative Instruments Held For Trading Purposes Net GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet	-280824000
CY2011	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	21328000
CY2011	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	108461000
CY2011	us-gaap	Interest Expense Debt InterestExpenseDebt	128092000
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	63843000
CY2011	us-gaap	Revenues Revenues	295764000
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	73850000
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-3311000
CY2011	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1436000
CY2011	us-gaap	Premiums Earned Net Financial Guarantee Insurance Contracts PremiumsEarnedNetFinancialGuaranteeInsuranceContracts	405970000
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	77422000
CY2011	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	37156000
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	120637000
CY2011	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	-1171000
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	31031000
CY2011	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	73850000
CY2011	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	-25895000
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	60000
CY2011	us-gaap	Revenue From Administrative Services Other RevenueFromAdministrativeServicesOther	295764000
CY2011	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	-12576000
CY2011	abk	Assets Transferred To Special Purpose Entities AssetsTransferredToSpecialPurposeEntities	0
CY2011	abk	Payments From Drawdowns Of Borrowings Under Guaranteed Investment Agreements PaymentsFromDrawdownsOfBorrowingsUnderGuaranteedInvestmentAgreements	258364000
CY2011	abk	Premiums Written Financial Guarantee Insurance Contracts Percentage Of Amount Assumed To Net PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet		pure
CY2011	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	17347000
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	610000
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	77422000
CY2011	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentAccretionOfDiscountOnPremiumReceivable	62841000
CY2011	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	1251271000
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-3900000
CY2011	us-gaap	Debt Instrument Interest Rate Effective Percentage Rate Range Maximum DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum	0.0611	pure
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-1788839000
CY2011	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	17347000
CY2011	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	6397000
CY2011	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	73175000
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	3119000
CY2011	us-gaap	Premiums Written Net Financial Guarantee Insurance Contracts PremiumsWrittenNetFinancialGuaranteeInsuranceContracts	158118000
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-659032000
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	3557000
CY2011	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	48614000
CY2011	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	503697000
CY2011	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	5679000
CY2011	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	2128852000
CY2011	abk	Proceeds From Issuance Of Borrowings Under Guaranteed Investment Agreements ProceedsFromIssuanceOfBorrowingsUnderGuaranteedInvestmentAgreements	123000
CY2011	abk	Statutory Accounting Practices Capital StatutoryAccountingPracticesCapital	684610000
CY2011	abk	Premiums Written Gross PremiumsWrittenGross	-178953000
CY2011	abk	Other Than Temporary Impairment Losses OtherThanTemporaryImpairmentLosses	90356000
CY2011	abk	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	17347000
CY2011	abk	Net Other Than Temporary Impairment Losses Recognized In Earnings NetOtherThanTemporaryImpairmentLossesRecognizedInEarnings	-63843000
CY2011	abk	Stock Based Compensation StockBasedCompensation	52614000
CY2011	abk	Net Unrealized Losses On Securities Tax Effect NetUnrealizedLossesOnSecuritiesTaxEffect	58597000
CY2011	abk	Investment Income Interest On Debt Securities InvestmentIncomeInterestOnDebtSecurities	355522000
CY2011	abk	Investment Income Interest On Loans Receivable InvestmentIncomeInterestOnLoansReceivable	890000
CY2011	abk	Income Loss From Continuing Operations Before Reorganization Items And Income Taxes IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes	-1833088000
CY2011	abk	Realized Gains Losses And Other Settlements RealizedGainsLossesAndOtherSettlements	17001000
CY2011	abk	Valuation Allowances And Reserves Charged To Equity ValuationAllowancesAndReservesChargedToEquity	58597000
CY2011	abk	Unrealized Gains Losses UnrealizedGainsLosses	31031000
CY2011	abk	Proceeds Received From Variable Interest Entity ProceedsReceivedFromVariableInterestEntity	35600000
CY2011	abk	Portion Of Loss Recognized In Other Comprehensive Income PortionOfLossRecognizedInOtherComprehensiveIncome	-26513000
CY2011	abk	Interest Paid On Investment Agreements InterestPaidOnInvestmentAgreements	8456000
CY2011	abk	Increase Decrease Variable Interest Entity Activities IncreaseDecreaseVariableInterestEntityActivities	-214368000
CY2011	abk	Income Loss On Variable Interest Entities IncomeLossOnVariableInterestEntities	-214368000
CY2011	abk	Amount Received Under Derivatives With Sponsored Special Purpose Entities AmountReceivedUnderDerivativesWithSponsoredSpecialPurposeEntities	8039000
CY2011	abk	Liability For Unpaid Claims And Claims Adjustment Expense Establishment Of Subrogation Recoveries Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseEstablishmentOfSubrogationRecoveriesCurrentYear	9761000
CY2011	abk	Net Change In Fair Value Of Credit Derivatives NetChangeInFairValueOfCreditDerivatives	48032000
CY2011	abk	Percentage Of Premiums Receivable Related To Non Investment Grade Rmbs Transactions PercentageOfPremiumsReceivableRelatedToNonInvestmentGradeRmbsTransactions	0.09	pure
CY2011	abk	Percentage Of Premiums Receivable Related To Student Loan Transactions PercentageOfPremiumsReceivableRelatedToStudentLoanTransactions	0.11	pure
CY2011	abk	Percentage Premiums Receivable Related To Transactions With Non Investment Grade Internal Ratings PercentagePremiumsReceivableRelatedToTransactionsWithNonInvestmentGradeInternalRatings	0.43	pure
CY2011	abk	Professional Fees Paid Relating To Chapter Eleven Proceeding ProfessionalFeesPaidRelatingToChapterElevenProceeding	31253000
CY2011	abk	Profit Loss Before Tax From Unaffiliated Customer ProfitLossBeforeTaxFromUnaffiliatedCustomer	-1882949000
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2011	abk	Debtor Reorganization Items Office Lease Settlement DebtorReorganizationItemsOfficeLeaseSettlement	14007000
CY2011	abk	Derivatives Credit Risk Valuation Adjustment Derivative Liabilities Other Than Credit Derivatives DerivativesCreditRiskValuationAdjustmentDerivativeLiabilitiesOtherThanCreditDerivatives	166868000
CY2011	abk	Financial Guarantee Insurance Contracts Premium Receivable Consolidation Of Certain Variable Interest Entity FinancialGuaranteeInsuranceContractsPremiumReceivableConsolidationOfCertainVariableInterestEntity	104736000
CY2011	abk	Financial Guarantee Insurance Contracts Premium Receivable Deconsolidation Of Certain Variable Interest Entity FinancialGuaranteeInsuranceContractsPremiumReceivableDeconsolidationOfCertainVariableInterestEntity	87978000
CY2011	abk	Insurance Premium Earned Related To Sponsored Special Purpose Entities InsurancePremiumEarnedRelatedToSponsoredSpecialPurposeEntities	764000
CY2011	abk	Liability For Unpaid Claims And Claims Adjustment Expense Change In Deconsolidation LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInDeconsolidation	134596000
CY2011	abk	Liability For Unpaid Claims And Claims Adjustment Expense Change In Loss Reserves Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesCurrentYear	491494000
CY2011	abk	Amounts Recovered On Previously Paid Claims Related To Sponsored Special Purpose Entities AmountsRecoveredOnPreviouslyPaidClaimsRelatedToSponsoredSpecialPurposeEntities	5768000
CY2011	abk	Investment Income Insurance Entity Short Term Investments InvestmentIncomeInsuranceEntityShortTermInvestments	1795000
CY2011	abk	Postemployment And Postretirement Benefits Period Expense PostemploymentAndPostretirementBenefitsPeriodExpense	4037000
CY2011	abk	Stock Option Plan Expense Net Of Tax StockOptionPlanExpenseNetOfTax	-11297000
CY2011	abk	Liability For Unpaid Claims And Claims Adjustment Expense Change In Previously Established Loss Reserves Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInPreviouslyEstablishedLossReservesPriorYears	1683831000
CY2011	abk	Liability For Unpaid Claims And Claims Adjustment Expense Change In Established Of Subrogation Recoveries Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInEstablishedOfSubrogationRecoveriesPriorYears	324151000
CY2011	abk	Loss Adjustment Expense Incurred LossAdjustmentExpenseIncurred	26384000
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000874501
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Trading Symbol TradingSymbol	ABK
CY2012	dei	Entity Registrant Name EntityRegistrantName	AMBAC FINANCIAL GROUP INC
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Entity Filer Category EntityFilerCategory	Smaller Reporting Company
CY2012	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	127628000
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Translation Gain Loss Arising During Period Tax OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax	0
CY2012	us-gaap	Ceded Premiums Earned Financial Guarantee Insurance Contracts CededPremiumsEarnedFinancialGuaranteeInsuranceContracts	20039000
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised		shares
CY2012	us-gaap	Reorganization Items ReorganizationItems	7215000
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	-24007000
CY2012	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-299906000
CY2012	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Premium Payments Received FinancialGuaranteeInsuranceContractsPremiumReceivablePremiumPaymentsReceived	155626000
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-540000
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-256505000
CY2012	us-gaap	Income Tax Expense Benefit Continuing Operations IncomeTaxExpenseBenefitContinuingOperations	2849000
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	536654	shares
CY2012	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-121413000
CY2012	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.016	pure
CY2012	us-gaap	Incurred Claims Financial Guarantee Insurance Contracts IncurredClaimsFinancialGuaranteeInsuranceContracts	683630000
CY2012	us-gaap	Assumed Premiums Written Financial Guarantee Insurance Contracts AssumedPremiumsWrittenFinancialGuaranteeInsuranceContracts
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears	944860000
CY2012	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-168242000
CY2012	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-1586000
CY2012	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed For Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear	0.085	pure
CY2012	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	17795000
CY2012	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	-407858000
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	188446000
CY2012	us-gaap	Increase Decrease In Loss And Loss Adjustment Expense Reserve IncreaseDecreaseInLossAndLossAdjustmentExpenseReserve	-261304000
CY2012	us-gaap	Profit Loss ProfitLoss	-259354000
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1037980000
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	1493000
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	454000
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-206000
CY2012	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	6996000
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	302468867	shares
CY2012	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	Segment
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear	20765000
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P1Y5M16D
CY2012	us-gaap	Other Underwriting Expense OtherUnderwritingExpense	139029000
CY2012	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	-635346000
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-105906000
CY2012	us-gaap	Other Income OtherIncome	106098000
CY2012	us-gaap	Investment Income Net InvestmentIncomeNet	388504000
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.011	pure
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P7Y
CY2012	us-gaap	Debt Instrument Interest Rate Effective Percentage Rate Range Minimum DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum	0.0033	pure
CY2012	us-gaap	Debtor Reorganization Items Other Expense Income DebtorReorganizationItemsOtherExpenseIncome	50000
CY2012	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Other Adjustments FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentOtherAdjustments	25298000
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	27838000
CY2012	us-gaap	Interest Expense Debt InterestExpenseDebt	112320000
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1586000
CY2012	us-gaap	Premiums Earned Net PremiumsEarnedNet	414604000
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	-0.419	pure
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	824000
CY2012	us-gaap	Operating Loss Carryforwards Expiration Dates OperatingLossCarryforwardsExpirationDates	Expiring in 2029 and will fully expire in 2034
CY2012	us-gaap	Contractual Interest Expense On Prepetition Liabilities Not Recognized In Statement Of Operations ContractualInterestExpenseOnPrepetitionLiabilitiesNotRecognizedInStatementOfOperations	85371000
CY2012	us-gaap	Income Tax Examination Interest Expense IncomeTaxExaminationInterestExpense	0
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.011	pure
CY2012	us-gaap	Gain Loss On Derivative Instruments Net Pretax GainLossOnDerivativeInstrumentsNetPretax	-9219000
CY2012	us-gaap	Financial Guarantee Insurance Contracts Premium Received Over Contract Period Premium Receivable Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodPremiumReceivableWeightedAverageRiskFreeDiscountRate	0.026	pure
CY2012	us-gaap	Increase Decrease In Deferred Policy Acquisition Costs IncreaseDecreaseInDeferredPolicyAcquisitionCosts	-24350000
CY2012	us-gaap	Assumed Premiums Earned Financial Guarantee Insurance Contracts AssumedPremiumsEarnedFinancialGuaranteeInsuranceContracts	155000
CY2012	us-gaap	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTax	3792000
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements		pure
CY2012	us-gaap	Insured Financial Obligations With Credit Deterioration Remaining Weighted Average Contract Period InsuredFinancialObligationsWithCreditDeteriorationRemainingWeightedAverageContractPeriod	P13Y
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	592672000
CY2012	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	1.00	pure
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	5252000
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	161920000
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.85
CY2012	us-gaap	Fair Value Inputs Long Term Net Of Tax Operating Income Margin Percent FairValueInputsLongTermNetOfTaxOperatingIncomeMarginPercent	0.20	pure
CY2012	us-gaap	Derivative Credit Risk Related Contingent Features Triggering Circumstances DerivativeCreditRiskRelatedContingentFeaturesTriggeringCircumstances	None of our outstanding credit derivative transactions
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y5M16D
CY2012	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	189402000
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	345000
CY2012	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3066000
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod		shares
CY2012	us-gaap	Net Investment Income NetInvestmentIncome	382902000
CY2012	us-gaap	Financial Guarantee Insurance Contracts Premium Received Over Contract Period Premium Receivable Weighted Average Collection Period1 FinancialGuaranteeInsuranceContractsPremiumReceivedOverContractPeriodPremiumReceivableWeightedAverageCollectionPeriod1	P9Y7M6D
CY2012	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	5602000
CY2012	us-gaap	Increase Decrease Cash Collateral From Counterparties IncreaseDecreaseCashCollateralFromCounterparties	43635000
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	9350	shares
CY2012	us-gaap	Net Income Loss NetIncomeLoss	-256678000
CY2012	us-gaap	Direct Premiums Written Financial Guarantee Insurance Contracts DirectPremiumsWrittenFinancialGuaranteeInsuranceContracts	277508000
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.85
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
CY2012	us-gaap	Schedule Of Liability For Unpaid Claims And Claims Adjustment Expense ScheduleOfLiabilityForUnpaidClaimsAndClaimsAdjustmentExpense	<div> <p style="MARGIN-TOP: 6px; TEXT-INDENT: 4%; MARGIN-BOTTOM: 0px"> <font style="FONT-FAMILY: Times New Roman" size="2">Below is the loss reserve roll-forward, net of subrogation recoverable and reinsurance for the years ended December 31, 2012 and 2011:</font></p> <p style="MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px; FONT-SIZE: 12px">  </p> <table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="76%" align="center"> <tr> <td width="78%"></td> <td valign="bottom" width="3%"></td> <td></td> <td></td> <td></td> <td valign="bottom" width="3%"></td> <td></td> <td></td> <td></td> </tr> <tr> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font size="1"> </font></td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Year Ended<br /> December 31,<br /> 2012</b></font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font size="1"> </font></td> <td style="BORDER-BOTTOM: #000000 1px solid" valign="bottom" colspan="2" align="center"><font style="FONT-FAMILY: Times New Roman" size="1"><b>Year Ended<br /> December 31,<br /> 2011</b></font></td> <td valign="bottom"><font size="1"> </font></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Beginning balance of loss and loss expense reserves, net of subrogation recoverable and reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">6,230,780</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">4,424,450</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Changes in the loss and loss expense reserves due to:</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 3em"><font style="FONT-FAMILY: Times New Roman" size="2">Current year:</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Establishment of new loss and loss expense reserves, gross of subrogation and net of reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">464,058</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">503,697</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Paid claims and loss expenses, net of subrogation and reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(20,765</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(2,442</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> </tr> <tr> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Establishment of subrogation recoveries, net of reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(9,761</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 7em"><font style="FONT-FAMILY: Times New Roman" size="2">Total current year</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">443,293</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">491,494</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 3em"><font style="FONT-FAMILY: Times New Roman" size="2">Prior years:</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"></td> <td valign="bottom"></td> <td valign="bottom"></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Change in previously established loss and loss expense reserves, gross of subrogation and net of reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">72,700</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,683,831</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Paid claims and loss expenses, net of subrogation and reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(944,860</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(179,440</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 5em"><font style="FONT-FAMILY: Times New Roman" size="2">Change in previously established subrogation recoveries, net of reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">172,818</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(324,151</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td> </td> </tr> <tr> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 7em"><font style="FONT-FAMILY: Times New Roman" size="2">Total prior years</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(699,342</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,180,240</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Net change in loss and loss expense reserves</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">(256,049</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">) </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">1,671,734</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Net deconsolidation of VIEs</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">—  </font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2"> </font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">134,596</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 1px solid"> </p> </td> <td> </td> </tr> <tr bgcolor="#CCEEFF"> <td valign="top"> <p style="TEXT-INDENT: -1em; MARGIN-LEFT: 1em"><font style="FONT-FAMILY: Times New Roman" size="2">Ending loss and loss expense reserves, net of subrogation recoverable and reinsurance</font></p> </td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">5,974,731</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> <td valign="bottom"><font size="1"> </font></td> <td valign="bottom"><font style="FONT-FAMILY: Times New Roman" size="2">$</font></td> <td valign="bottom" align="right"><font style="FONT-FAMILY: Times New Roman" size="2">6,230,780</font></td> <td valign="bottom" nowrap="nowrap"><font style="FONT-FAMILY: Times New Roman" size="2">  </font></td> </tr> <tr style="FONT-SIZE: 1px"> <td valign="bottom"></td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 3px double"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 3px double"> </p> </td> <td> </td> <td valign="bottom"> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 3px double"> </p> </td> <td valign="bottom"> <p style="BORDER-TOP: #000000 3px double"> </p> </td> <td> </td> </tr> </table> </div>
CY2012	us-gaap	Ceded Premiums Written Financial Guarantee Insurance Contracts CededPremiumsWrittenFinancialGuaranteeInsuranceContracts	23371000
CY2012	us-gaap	Defined Contribution Plan Maximum Annual Contribution Per Employee Percent DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent	0.03	pure
CY2012	us-gaap	Increase Decrease In Accrued Investment Income Receivable IncreaseDecreaseInAccruedInvestmentIncomeReceivable	-5586000
CY2012	us-gaap	Causes Of Increase Decrease In Liability For Unpaid Claims And Claims Adjustment Expense Amount CausesOfIncreaseDecreaseInLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseAmount	-699342000
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	302468867	shares
CY2012	us-gaap	Direct Premiums Earned Financial Guarantee Insurance Contracts DirectPremiumsEarnedFinancialGuaranteeInsuranceContracts	434488000
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-396244000
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeTax	0
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	107502000
CY2012	us-gaap	Derivative Average Remaining Maturity1 DerivativeAverageRemainingMaturity1	P3Y7M6D
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	73404000
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Exempt Income EffectiveIncomeTaxRateReconciliationTaxExemptIncome	0.069	pure
CY2012	us-gaap	Debtor Reorganization Items Legal And Advisory Professional Fees DebtorReorganizationItemsLegalAndAdvisoryProfessionalFees	7165000
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-94552000
CY2012	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1109468000
CY2012	us-gaap	Gain Loss On Derivative Instruments Held For Trading Purposes Net GainLossOnDerivativeInstrumentsHeldForTradingPurposesNet	-125004000
CY2012	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	26825000
CY2012	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	89276000
CY2012	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	5990000
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	2713000
CY2012	us-gaap	Revenues Revenues	685689000
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	2919000
CY2012	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-175000
CY2012	us-gaap	Premiums Earned Net Financial Guarantee Insurance Contracts PremiumsEarnedNetFinancialGuaranteeInsuranceContracts	414604000
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2849000
CY2012	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	664000
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	221150000
CY2012	us-gaap	Payments For Proceeds From Loans Receivable PaymentsForProceedsFromLoansReceivable	-9793000
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-22932000
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	0	shares
CY2012	us-gaap	Increase Decrease In Reinsurance Payables IncreaseDecreaseInReinsurancePayables	-21028000
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-2676000
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	0	shares
CY2012	us-gaap	Revenue From Administrative Services Other RevenueFromAdministrativeServicesOther	685689000
CY2012	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	0
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	0
CY2012	us-gaap	Availableforsale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	72101000
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1058000
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	3476000
CY2012	us-gaap	Income Tax Effects Allocated Directly To Equity IncomeTaxEffectsAllocatedDirectlyToEquity
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-613898000
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1263000
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	49.63
CY2012	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentAccretionOfDiscountOnPremiumReceivable	50407000
CY2012	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	28031000
CY2012	us-gaap	Payments To Acquire Available For Sale Securities PaymentsToAcquireAvailableForSaleSecurities	798740000
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	40261000
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment For Sale Of Securities Included In Net Income Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax	-54898000
CY2012	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Incurred Claims Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaimsCurrentYear	464058000
CY2012	us-gaap	Loss Contingency Damages Sought Value LossContingencyDamagesSoughtValue	4524000
CY2012	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	1128000
CY2012	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	934979000
CY2012	abk	Assets Transferred To Special Purpose Entities AssetsTransferredToSpecialPurposeEntities	0
CY2012	us-gaap	Debt Instrument Interest Rate Effective Percentage Rate Range Maximum DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum	0.0604	pure
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-97434000
CY2012	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	72101000
CY2012	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	5166000
CY2012	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	1069000
CY2012	us-gaap	Income Tax Effects Allocated Directly To Equity Other IncomeTaxEffectsAllocatedDirectlyToEquityOther
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-177580000
CY2012	us-gaap	Premiums Written Net Financial Guarantee Insurance Contracts PremiumsWrittenNetFinancialGuaranteeInsuranceContracts	254137000
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	0
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-89777000
CY2012	abk	Payments From Drawdowns Of Borrowings Under Guaranteed Investment Agreements PaymentsFromDrawdownsOfBorrowingsUnderGuaranteedInvestmentAgreements	186786000
CY2012	abk	Premiums Written Financial Guarantee Insurance Contracts Percentage Of Amount Assumed To Net PremiumsWrittenFinancialGuaranteeInsuranceContractsPercentageOfAmountAssumedToNet		pure
CY2012	abk	Statutory Accounting Practices Capital StatutoryAccountingPracticesCapital	628302000
CY2012	abk	Premiums Written Gross PremiumsWrittenGross	-277508000
CY2012	abk	Other Than Temporary Impairment Losses OtherThanTemporaryImpairmentLosses	15659000
CY2012	abk	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	72101000
CY2012	abk	Net Other Than Temporary Impairment Losses Recognized In Earnings NetOtherThanTemporaryImpairmentLossesRecognizedInEarnings	-5990000
CY2012	abk	Stock Based Compensation StockBasedCompensation	664000
CY2012	abk	Unfunded Accumulated Postretirement Benefit Obligations Determined By Company UnfundedAccumulatedPostretirementBenefitObligationsDeterminedByCompany	17485000
CY2012	abk	Net Unrealized Losses On Securities Tax Effect NetUnrealizedLossesOnSecuritiesTaxEffect	18448000
CY2012	abk	Investment Income Interest On Debt Securities InvestmentIncomeInterestOnDebtSecurities	386385000
CY2012	abk	Investment Income Interest On Loans Receivable InvestmentIncomeInterestOnLoansReceivable	714000
CY2012	abk	Income Loss From Continuing Operations Before Reorganization Items And Income Taxes IncomeLossFromContinuingOperationsBeforeReorganizationItemsAndIncomeTaxes	-249290000
CY2012	abk	Realized Gains Losses And Other Settlements RealizedGainsLossesAndOtherSettlements	13713000
CY2012	abk	Valuation Allowances And Reserves Charged To Equity ValuationAllowancesAndReservesChargedToEquity	18448000
CY2012	abk	Unrealized Gains Losses UnrealizedGainsLosses	-22932000
CY2012	abk	Portion Of Loss Recognized In Other Comprehensive Income PortionOfLossRecognizedInOtherComprehensiveIncome	-9669000
CY2012	abk	Paydown Of Variable Interest Entity Secured Borrowing PaydownOfVariableInterestEntitySecuredBorrowing	21012000
CY2012	abk	Interest Paid On Investment Agreements InterestPaidOnInvestmentAgreements	7264000
CY2012	abk	Increase Decrease Variable Interest Entity Activities IncreaseDecreaseVariableInterestEntityActivities	27777000
CY2012	abk	Income Loss On Variable Interest Entities IncomeLossOnVariableInterestEntities	27777000
CY2012	abk	Amount Received Under Derivatives With Sponsored Special Purpose Entities AmountReceivedUnderDerivativesWithSponsoredSpecialPurposeEntities	7356000
CY2012	abk	Available For Sale Securities Continuous Unrealized Loss Position Period Twelve Months Or Longer Aggregate Losses By Issuance By Large Diversified Financial Services AvailableForSaleSecuritiesContinuousUnrealizedLossPositionPeriodTwelveMonthsOrLongerAggregateLossesByIssuanceByLargeDiversifiedFinancialServices	P66M
CY2012	abk	Derivatives Credit Risk Valuation Adjustment Derivative Liabilities Other Than Credit Derivatives DerivativesCreditRiskValuationAdjustmentDerivativeLiabilitiesOtherThanCreditDerivatives	121928000
CY2012	abk	Fair Value Measurement Process Description For Credit Derivatives Hypothetical Incremental Fee FairValueMeasurementProcessDescriptionForCreditDerivativesHypotheticalIncrementalFee	0.0005	pure
CY2012	abk	Fair Value Measurement Process Description For Credit Derivatives Hypothetical Incremental Fee With Credit Deterioration FairValueMeasurementProcessDescriptionForCreditDerivativesHypotheticalIncrementalFeeWithCreditDeterioration	0.0015	pure
CY2012	abk	Fair Value Measurement Process Description For Credit Derivatives Remaining Life FairValueMeasurementProcessDescriptionForCreditDerivativesRemainingLife	P8Y
CY2012	abk	Fair Value Measurement Process Description For Credit Derivatives Revised Relative Change Ratio FairValueMeasurementProcessDescriptionForCreditDerivativesRevisedRelativeChangeRatio	0.732	pure
CY2012	abk	Operating Tax Carryforward Expiration Year End OperatingTaxCarryforwardExpirationYearEnd	2034
CY2012	abk	Insurance Premium Earned Related To Sponsored Special Purpose Entities InsurancePremiumEarnedRelatedToSponsoredSpecialPurposeEntities	398000
CY2012	abk	Interest Paid On Variable Interest Entity Secured Borrowing InterestPaidOnVariableInterestEntitySecuredBorrowing	1572000
CY2012	abk	Liability For Unpaid Claims And Claims Adjustment Expense Change In Loss Reserves Current Year LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInLossReservesCurrentYear	443293000
CY2012	abk	Net Change In Fair Value Of Credit Derivatives NetChangeInFairValueOfCreditDerivatives	-9219000
CY2012	abk	Net Par Exposure For Policies Allocated To Segregated Account NetParExposureForPoliciesAllocatedToSegregatedAccount	27162620000
CY2012	abk	Operating Tax Carryforward Expiration Year Start OperatingTaxCarryforwardExpirationYearStart	2029
CY2012	abk	Payment As Percentage Of Permitted Policy Claim PaymentAsPercentageOfPermittedPolicyClaim	0.25	pure
CY2012	abk	Percentage Of Credit Derivative Gross Par Outstanding Using Internally Estimated Reference Obligation Prices In Determination Of Fair Value PercentageOfCreditDerivativeGrossParOutstandingUsingInternallyEstimatedReferenceObligationPricesInDeterminationOfFairValue	0.19	pure
CY2012	abk	Percentage Of Credit Derivative Liability Using Internally Estimated Reference Obligation Prices In Determination Of Fair Value PercentageOfCreditDerivativeLiabilityUsingInternallyEstimatedReferenceObligationPricesInDeterminationOfFairValue	0.21	pure
CY2012	abk	Percentage Of Credit Derivatives Gross Par Outstanding Using Third Party Reference Obligation Quotes In Determination Of Fair Value PercentageOfCreditDerivativesGrossParOutstandingUsingThirdPartyReferenceObligationQuotesInDeterminationOfFairValue	0.81	pure
CY2012	abk	Percentage Of Credit Derivatives Liability Using Third Party Reference Obligation Quotes In Determination Of Fair Value PercentageOfCreditDerivativesLiabilityUsingThirdPartyReferenceObligationQuotesInDeterminationOfFairValue	0.79	pure
CY2012	abk	Percentage Of Premiums Receivable Related To Non Investment Grade Rmbs Transactions PercentageOfPremiumsReceivableRelatedToNonInvestmentGradeRmbsTransactions	0.07	pure
CY2012	abk	Percentage Of Premiums Receivable Related To Student Loan Transactions PercentageOfPremiumsReceivableRelatedToStudentLoanTransactions	0.12	pure
CY2012	abk	Percentage Premiums Receivable Related To Transactions With Non Investment Grade Internal Ratings PercentagePremiumsReceivableRelatedToTransactionsWithNonInvestmentGradeInternalRatings	0.40	pure
CY2012	abk	Professional Fees Paid Relating To Chapter Eleven Proceeding ProfessionalFeesPaidRelatingToChapterElevenProceeding	9141000
CY2012	abk	Profit Loss Before Tax From Unaffiliated Customer ProfitLossBeforeTaxFromUnaffiliatedCustomer	-256505000
CY2012	abk	Percentage Of Ceded Financial Guarantee Principal Outstanding PercentageOfCededFinancialGuaranteePrincipalOutstanding	1.0000	pure
CY2012	abk	Cumulative Other Than Temporary Impairment CumulativeOtherThanTemporaryImpairment	150000000
CY2012	abk	Stock Option Plan Expense Net Of Tax StockOptionPlanExpenseNetOfTax	0
CY2012	abk	Weighted Average Rating Of Assets Held By Sponsored Special Purpose Entities WeightedAverageRatingOfAssetsHeldBySponsoredSpecialPurposeEntities	No longer than 90 days
CY2012	abk	Accrued Interest Rate Percentage AccruedInterestRatePercentage	0.045	pure
CY2012	abk	Amounts Recovered On Previously Paid Claims Related To Sponsored Special Purpose Entities AmountsRecoveredOnPreviouslyPaidClaimsRelatedToSponsoredSpecialPurposeEntities	14691000
CY2012	abk	Percentage Decline In Market Value Below Amortization Cost PercentageDeclineInMarketValueBelowAmortizationCost	0.20	pure
CY2012	abk	Investment Income Insurance Entity Short Term Investments InvestmentIncomeInsuranceEntityShortTermInvestments	1405000
CY2012	abk	Other Comprehensive Income Loss Amortization Pension And Other Postretirement Benefit Plans Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Taxes OtherComprehensiveIncomeLossAmortizationPensionAndOtherPostretirementBenefitPlansNetPriorServiceCostRecognizedInNetPeriodicPensionCostNetOfTaxes	0
CY2012	abk	Postemployment And Postretirement Benefits Period Expense PostemploymentAndPostretirementBenefitsPeriodExpense	2099000
CY2012	abk	Misallocation Of Tax Refunds Received MisallocationOfTaxRefundsReceived	38486000
CY2012	abk	Insurance Liabilities Not Assumed InsuranceLiabilitiesNotAssumed	163687000
CY2012	abk	Percentage Of Principal Balance Of Impaired Loans PercentageOfPrincipalBalanceOfImpairedLoans	0.39	pure
CY2012	abk	Number Of Sponsors NumberOfSponsors	8	Customer
CY2012	abk	Number Of Insured Transactions Reviewed NumberOfInsuredTransactionsReviewed	49	Transactions
CY2012	abk	Liability For Unpaid Claims And Claims Adjustment Expense Change In Previously Established Loss Reserves Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInPreviouslyEstablishedLossReservesPriorYears	72700000
CY2012	abk	Liability For Unpaid Claims And Claims Adjustment Expense Change In Established Of Subrogation Recoveries Prior Years LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseChangeInEstablishedOfSubrogationRecoveriesPriorYears	-172818000
CY2012	abk	Loss Adjustment Expense Incurred LossAdjustmentExpenseIncurred	83226000
CY2012	abk	Ceded Principal Outstanding Major Reinsurer Percentage CededPrincipalOutstandingMajorReinsurerPercentage	0.077	pure
CY2012	abk	Additional Transactions Reviewed Changes In Rmbs Subrogation AdditionalTransactionsReviewedChangesInRmbsSubrogation	-18981000
CY2012	abk	Additional Adverse Sample Loans Reviewed Change In Rmbs Subrogation AdditionalAdverseSampleLoansReviewedChangeInRmbsSubrogation
CY2012	abk	Adverse Loans Repurchased By Sponsor Change In Rmbs Subrogation AdverseLoansRepurchasedBySponsorChangeInRmbsSubrogation	35000
CY2012	abk	Other Changes Rmbs Subrogation OtherChangesRmbsSubrogation	-216057000

Files In Submission

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0001193125-13-122346.txt	Edgar Link	pending
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abk-20121231.xml	Edgar Link	completed
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$AMBC
AMBAC FINANCIAL GROUP INC Stock $ambc

2012 Q4 Form 10-K Financial Statement

#000119312513122346 Filed on March 22, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMBC AMBAC FINANCIAL GROUP INC Stock $ambc

2012 Q4 Form 10-K Financial Statement

#000119312513122346 Filed on March 22, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AMBC
AMBAC FINANCIAL GROUP INC Stock $ambc