$AGO
ASSURED GUARANTY LTD Stock $ago

$ago Overview Financials Valuation SEC Filings Company Website

2019 Q1 Form 10-Q Financial Statement

#000127381319000025 Filed on May 10, 2019

Income Statement

Concept	2019 Q1	2018 Q1
Revenue	$195.0M	$293.0M
YoY Change	-33.45%	-44.4%
Cost Of Revenue	$46.00M	-$18.00M
YoY Change	-355.56%	-130.51%
Gross Profit	$149.0M	$311.0M
YoY Change	-52.09%	-33.55%
Gross Profit Margin	76.41%	106.14%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$6.000M	$5.000M
YoY Change	20.0%	25.0%
% of Gross Profit	4.03%	1.61%
Operating Expenses	$116.0M	$52.00M
YoY Change	123.08%	-60.31%
Operating Profit	$33.00M	$259.0M
YoY Change	-87.26%	-23.15%
Interest Expense	$23.00M	$24.00M
YoY Change	-4.17%	0.0%
% of Operating Profit	69.7%	9.27%
Other Income/Expense, Net
YoY Change
Pretax Income	$58.00M	$217.0M
YoY Change	-73.27%	-41.67%
Income Tax	$4.000M	$20.00M
% Of Pretax Income	6.9%	9.22%
Net Earnings	$54.00M	$197.0M
YoY Change	-72.59%	-37.85%
Net Earnings / Revenue	27.69%	67.24%
Basic Earnings Per Share	$0.52	$1.71
Diluted Earnings Per Share	$0.52	$1.68
COMMON SHARES
Basic Shares Outstanding	103.0M shares	115.2M shares
Diluted Shares Outstanding	104.0M shares	116.6M shares

Balance Sheet

Concept	2019 Q1	2018 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$123.0M	$117.0M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment
YoY Change
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$10.78B	$11.15B
YoY Change	-3.35%	-1.68%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$13.55B	$14.02B
YoY Change	-3.34%	-4.47%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$93.00M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$93.00M
YoY Change
LONG-TERM LIABILITIES
Long-Term Debt	$1.232B	$1.281B
YoY Change	-3.83%	-1.99%
Other Long-Term Liabilities	$1.088B	$1.260B
YoY Change	-13.65%	-21.05%
Total Long-Term Liabilities	$2.320B	$2.541B
YoY Change	-8.7%	-12.47%
TOTAL LIABILITIES
Total Short-Term Liabilities	$93.00M
Total Long-Term Liabilities	$2.320B	$2.541B
Total Liabilities	$6.882B	$7.235B
YoY Change	-4.88%	-9.99%
SHAREHOLDERS EQUITY
Retained Earnings	$6.406B	$6.102B
YoY Change	4.98%	9.2%
Common Stock	$1.000M	$467.0M
YoY Change	-99.79%	-44.54%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.669B	$6.784B
YoY Change
Total Liabilities & Shareholders Equity	$13.55B	$14.02B
YoY Change	-3.34%	-4.47%

Cashflow Statement

Concept	2019 Q1	2018 Q1
OPERATING ACTIVITIES
Net Income	$54.00M	$197.0M
YoY Change	-72.59%	-37.85%
Depreciation, Depletion And Amortization	$6.000M	$5.000M
YoY Change	20.0%	25.0%
Cash From Operating Activities	-$332.0M	$27.00M
YoY Change	-1329.63%	-73.53%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	$0.00	$14.00M
YoY Change	-100.0%	7.69%
Cash From Investing Activities	$492.0M	$126.0M
YoY Change	290.48%	-40.28%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$80.00M	$100.0M
YoY Change	-20.0%	-53.7%
Debt Paid & Issued, Net	$3.000M	$19.00M
YoY Change	-84.21%	1800.0%
Cash From Financing Activities	-$142.0M	-$181.0M
YoY Change	-21.55%	-38.44%
NET CHANGE
Cash From Operating Activities	-$332.0M	$27.00M
Cash From Investing Activities	$492.0M	$126.0M
Cash From Financing Activities	-$142.0M	-$181.0M
Net Change In Cash	$19.00M	-$28.00M
YoY Change	-167.86%	-247.37%
FREE CASH FLOW
Cash From Operating Activities	-$332.0M	$27.00M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019Q1	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	0	USD
CY2019Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2018Q4	ago	Insured Financial Obligations Loss Mitigation Securities InsuredFinancialObligationsLossMitigationSecurities	1900000000	USD
CY2018Q1	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	1000000	USD
CY2018Q1	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Excluding Other Than Temporary Impairment Losses Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodExcludingOtherThanTemporaryImpairmentLossesTax	-29000000	USD
CY2019Q1	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Excluding Other Than Temporary Impairment Losses Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodExcludingOtherThanTemporaryImpairmentLossesTax	25000000	USD
CY2018Q4	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	110	policies
CY2019Q1	dei	Amendment Flag AmendmentFlag	false
CY2019Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019Q1	dei	Document Period End Date DocumentPeriodEndDate	2019-03-31
CY2019Q1	dei	Document Type DocumentType	10-Q
CY2019Q1	dei	Entity Central Index Key EntityCentralIndexKey	0001273813
CY2019Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	101563349	shares
CY2019Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019Q1	dei	Entity Registrant Name EntityRegistrantName	ASSURED GUARANTY LTD
CY2019Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2018Q4	us-gaap	Aoci Tax Attributable To Parent AociTaxAttributableToParent	38000000	USD
CY2019Q1	us-gaap	Aoci Tax Attributable To Parent AociTaxAttributableToParent	63000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	9884000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	9590000000	USD
CY2018Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.16
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q1	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2019Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	103672592	shares
CY2019Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	102270409	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	103672592	shares
CY2019Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	102270409	shares
CY2018Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	1000000	USD
CY2019Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16000000	USD
CY2019Q1	us-gaap	Trading Securities Debt TradingSecuritiesDebt	9989000000	USD
CY2018Q4	us-gaap	Trading Securities Debt TradingSecuritiesDebt	10089000000	USD
CY2019Q1	us-gaap	Short Term Investments ShortTermInvestments	727000000	USD
CY2018Q4	us-gaap	Short Term Investments ShortTermInvestments	729000000	USD
CY2019Q1	us-gaap	Other Investments OtherInvestments	61000000	USD
CY2018Q4	us-gaap	Other Investments OtherInvestments	55000000	USD
CY2019Q1	us-gaap	Investments Investments	10777000000	USD
CY2018Q4	us-gaap	Investments Investments	10873000000	USD
CY2019Q1	us-gaap	Cash Cash	123000000	USD
CY2018Q4	us-gaap	Cash Cash	104000000	USD
CY2019Q1	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	897000000	USD
CY2018Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	904000000	USD
CY2019Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	104000000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	105000000	USD
CY2019Q1	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	522000000	USD
CY2018Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	490000000	USD
CY2019Q1	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	560000000	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	569000000	USD
CY2019Q1	us-gaap	Other Assets OtherAssets	568000000	USD
CY2018Q4	us-gaap	Other Assets OtherAssets	558000000	USD
CY2019Q1	us-gaap	Assets Assets	13551000000	USD
CY2018Q4	us-gaap	Assets Assets	13603000000	USD
CY2019Q1	us-gaap	Unearned Premiums UnearnedPremiums	3437000000	USD
CY2018Q4	us-gaap	Unearned Premiums UnearnedPremiums	3512000000	USD
CY2019Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1032000000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1177000000	USD
CY2019Q1	us-gaap	Long Term Debt LongTermDebt	1232000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	1233000000	USD
CY2019Q1	us-gaap	Credit Risk Derivative Liabilities At Fair Value CreditRiskDerivativeLiabilitiesAtFairValue	229000000	USD
CY2018Q4	us-gaap	Credit Risk Derivative Liabilities At Fair Value CreditRiskDerivativeLiabilitiesAtFairValue	209000000	USD
CY2019Q1	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities With Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithRecourse	505000000	USD
CY2018Q4	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities With Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithRecourse	517000000	USD
CY2019Q1	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities Without Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithoutRecourse	104000000	USD
CY2018Q4	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities Without Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithoutRecourse	102000000	USD
CY2019Q1	us-gaap	Other Liabilities OtherLiabilities	343000000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	298000000	USD
CY2019Q1	us-gaap	Liabilities Liabilities	6882000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	7048000000	USD
CY2019Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2019Q1	us-gaap	Common Stock Value CommonStockValue	1000000	USD
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	1000000	USD
CY2019Q1	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	0	USD
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	86000000	USD
CY2019Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	6406000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	6374000000	USD
CY2019Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	261000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	93000000	USD
CY2019Q1	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	1000000	USD
CY2018Q4	us-gaap	Compensation And Benefits Trust CompensationAndBenefitsTrust	1000000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	6669000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	6555000000	USD
CY2019Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13551000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13603000000	USD
CY2019Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	118000000	USD
CY2018Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	145000000	USD
CY2019Q1	us-gaap	Net Investment Income NetInvestmentIncome	98000000	USD
CY2018Q1	us-gaap	Net Investment Income NetInvestmentIncome	100000000	USD
CY2019Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-12000000	USD
CY2018Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-5000000	USD
CY2019Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-22000000	USD
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CY2019Q1	ago	Variable Interest Entity Changein Fair Value VariableInterestEntityChangeinFairValue	5000000	USD
CY2018Q1	ago	Variable Interest Entity Changein Fair Value VariableInterestEntityChangeinFairValue	4000000	USD
CY2019Q1	us-gaap	Other Income OtherIncome	8000000	USD
CY2018Q1	us-gaap	Other Income OtherIncome	15000000	USD
CY2019Q1	us-gaap	Revenues Revenues	195000000	USD
CY2018Q1	us-gaap	Revenues Revenues	293000000	USD
CY2019Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	46000000	USD
CY2018Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	-18000000	USD
CY2019Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	6000000	USD
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CY2019Q1	us-gaap	Interest Expense InterestExpense	23000000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	24000000	USD
CY2019Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	64000000	USD
CY2018Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	65000000	USD
CY2019Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	139000000	USD
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CY2018Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	58000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	217000000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4000000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20000000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	54000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	197000000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
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CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	54000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	197000000	USD
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CY2018Q1	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities With No Other Than Temporary Impairment Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax	-128000000	USD
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CY2018Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	2000000	USD
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CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	6669000000	USD
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CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	6784000000	USD
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CY2019Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	196000000	USD
CY2018Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	411000000	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	471000000	USD
CY2018Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	409000000	USD
CY2019Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	177000000	USD
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CY2019Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	107000000	USD
CY2018Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	47000000	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2000000	USD
CY2018Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	0	USD
CY2019Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	67000000	USD
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CY2018Q1	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	114000000	USD
CY2019Q1	ago	Proceeds From Financial Guaranty Variable Interest Entities Assets ProceedsFromFinancialGuarantyVariableInterestEntitiesAssets	26000000	USD
CY2018Q1	ago	Proceeds From Financial Guaranty Variable Interest Entities Assets ProceedsFromFinancialGuarantyVariableInterestEntitiesAssets	33000000	USD
CY2019Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-27000000	USD
CY2018Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	14000000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	492000000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	126000000	USD
CY2019Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20000000	USD
CY2018Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18000000	USD
CY2019Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	80000000	USD
CY2018Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	100000000	USD
CY2019Q1	ago	Payments For Repurchase Of Common Stock For Tax Withholdings PaymentsForRepurchaseOfCommonStockForTaxWithholdings	15000000	USD
CY2018Q1	ago	Payments For Repurchase Of Common Stock For Tax Withholdings PaymentsForRepurchaseOfCommonStockForTaxWithholdings	12000000	USD
CY2019Q1	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	25000000	USD
CY2018Q1	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	33000000	USD
CY2019Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3000000	USD
CY2018Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	19000000	USD
CY2019Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1000000	USD
CY2018Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1000000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-142000000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-181000000	USD
CY2019Q1	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1000000	USD
CY2018Q1	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1000000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	19000000	USD
CY2018Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Excluding Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect	-27000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	104000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	144000000	USD
CY2019Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	123000000	USD
CY2018Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	117000000	USD
CY2019Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	0	USD
CY2018Q1	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10000000	USD
CY2019Q1	us-gaap	Interest Paid Net InterestPaidNet	9000000	USD
CY2018Q1	us-gaap	Interest Paid Net InterestPaidNet	21000000	USD
CY2019Q1	ago	Number Of Holding Companies Having Outstanding Public Debt NumberOfHoldingCompaniesHavingOutstandingPublicDebt	2	Company
CY2019Q1	ago	Insured Financial Obligations Outstanding Principal Amount Secondto Pay Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountSecondtoPayAmountNet	6500000000	USD
CY2018Q4	ago	Insured Financial Obligations Outstanding Principal Amount Secondto Pay Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountSecondtoPayAmountNet	6700000000	USD
CY2019Q1	ago	Insured Financial Obligations Loss Mitigation Securities InsuredFinancialObligationsLossMitigationSecurities	1900000000	USD
CY2019Q1	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	367696000000	USD
CY2018Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	375080000000	USD
CY2019Q1	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	364641000000	USD
CY2018Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	371586000000	USD
CY2019Q1	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	237325000000	USD
CY2019Q1	ago	Insured Financial Obligations Outstanding Principle Amount Percentage InsuredFinancialObligationsOutstandingPrincipleAmountPercentage	1.000
CY2018Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	241802000000	USD
CY2018Q4	ago	Insured Financial Obligations Outstanding Principle Amount Percentage InsuredFinancialObligationsOutstandingPrincipleAmountPercentage	1.000
CY2019Q1	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	237325000000	USD
CY2018Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	241802000000	USD
CY2019Q1	ago	Insured Financial Obligations Insured Credit Performanceof Guaranteed Obligations Term InsuredFinancialObligationsInsuredCreditPerformanceofGuaranteedObligationsTerm	P30Y
CY2019Q1	ago	Insured Financial Obligations Claim Liability Weighted Average Risk Free Discount Rate InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0246
CY2018	ago	Insured Financial Obligations Claim Liability Weighted Average Risk Free Discount Rate InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0274
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2017Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1303000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	8000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	8000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	-4000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	-6000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	-6000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	-26000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-2000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-24000000	USD
CY2019Q1	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	218000000	USD
CY2018Q1	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	-19000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	963000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1298000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-2000000	USD
CY2019Q1	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	218000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	963000000	USD
CY2017Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1303000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-24000000	USD
CY2018Q1	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	-19000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1298000000	USD
CY2019Q1	ago	Reinsurance Recoverables Periodafter Endof Reporting Periodfor Settlementof Ceded Paid Losses ReinsuranceRecoverablesPeriodafterEndofReportingPeriodforSettlementofCededPaidLosses	P45D
CY2019Q1	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	7000000	USD
CY2018Q1	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	5000000	USD
CY2019Q1	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	28000000	USD
CY2018Q4	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	31000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	963000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2019Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-2000000	USD
CY2018Q1	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-24000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	87000000	USD
CY2018Q1	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	88000000	USD
CY2019Q1	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	26000000	USD
CY2018Q1	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	52000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-4000000	USD
CY2018Q1	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-4000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	117000000	USD
CY2018Q1	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	144000000	USD
CY2019Q1	ago	Premiums Earned Net Non Financial Guarantee PremiumsEarnedNetNonFinancialGuarantee	1000000	USD
CY2018Q1	ago	Premiums Earned Net Non Financial Guarantee PremiumsEarnedNetNonFinancialGuarantee	1000000	USD
CY2019Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	118000000	USD
CY2018Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	145000000	USD
CY2018Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	904000000	USD
CY2017Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	915000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2017Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	903000000	USD
CY2017Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	914000000	USD
CY2019Q1	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	41000000	USD
CY2018Q1	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	75000000	USD
CY2019Q1	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	54000000	USD
CY2018Q1	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	63000000	USD
CY2019Q1	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-4000000	USD
CY2018Q1	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-3000000	USD
CY2019Q1	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	1000000	USD
CY2018Q1	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	-4000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	9000000	USD
CY2018Q1	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	24000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	896000000	USD
CY2018Q1	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	943000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2018Q1	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2019Q1	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	897000000	USD
CY2018Q1	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	944000000	USD
CY2019Q1	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0246
CY2018	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0274
CY2019Q1	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	492000000	USD
CY2018Q4	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	674000000	USD
CY2019Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1032000000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1177000000	USD
CY2019Q1	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	40000000	USD
CY2018Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	34000000	USD
CY2019Q1	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	992000000	USD
CY2018Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1143000000	USD
CY2019Q1	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	522000000	USD
CY2018Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	490000000	USD
CY2019Q1	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	24000000	USD
CY2018Q4	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	24000000	USD
CY2019Q1	ago	Payable Liabilityfor Unpaid Claimsand Claims Adjustment Expense Other Recoverable PayableLiabilityforUnpaidClaimsandClaimsAdjustmentExpenseOtherRecoverable	-2000000	USD
CY2018Q4	ago	Payable Liabilityfor Unpaid Claimsand Claims Adjustment Expense Other Recoverable PayableLiabilityforUnpaidClaimsandClaimsAdjustmentExpenseOtherRecoverable	-3000000	USD
CY2019Q1	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-500000000	USD
CY2018Q4	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-469000000	USD
CY2019Q1	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	492000000	USD
CY2018Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	674000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Second Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringSecondQuarterFollowingBalanceSheetDate	9000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Third Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringThirdQuarterFollowingBalanceSheetDate	9000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Fourth Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFourthQuarterFollowingBalanceSheetDate	8000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Fiscal Year Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFiscalYearFollowingBalanceSheetDate	26000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Second Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinSecondFullFiscalYear	35000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Third Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinThirdFullFiscalYear	35000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fourth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFourthFullFiscalYear	36000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fifth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFifthFullFiscalYear	36000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan Fiveand Within10 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethanFiveandWithin10YearsfromBalanceSheetDate	150000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan10andwithin15 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan10andwithin15YearsfromBalanceSheetDate	103000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan15andwithin20 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan15andwithin20YearsfromBalanceSheetDate	46000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Beyond Twentieth Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedBeyondTwentiethFiscalYear	10000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Present Value FinancialGuaranteeInsuranceContractsNetLosstobeExpensedPresentValue	477000000	USD
CY2019Q1	ago	Scheduleof Insured Financial Obligationswith Credit Deterioration Reductionsof Gross Claim Liability Netof Reinsurance Recoverable Discount ScheduleofInsuredFinancialObligationswithCreditDeteriorationReductionsofGrossClaimLiabilityNetofReinsuranceRecoverableDiscount	15000000	USD
CY2019Q1	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Undiscounted FinancialGuaranteeInsuranceContractsNetLosstobeExpensedUndiscounted	492000000	USD
CY2019Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	46000000	USD
CY2018Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	-18000000	USD
CY2019Q1	ago	Percentage Of Cds Contracts Fair Valued Using Minimum Premium PercentageOfCdsContractsFairValuedUsingMinimumPremium	0.001
CY2018Q4	ago	Percentage Of Cds Contracts Fair Valued Using Minimum Premium PercentageOfCdsContractsFairValuedUsingMinimumPremium	0.17
CY2019Q1	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P11Y7M6D
CY2019Q1	ago	Financial Guaranty Contracts Accountedforas Credit Derivatives Outstanding Principal Amount FinancialGuarantyContractsAccountedforasCreditDerivativesOutstandingPrincipalAmount	6120000000	USD
CY2019Q1	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-228000000	USD
CY2018Q4	ago	Financial Guaranty Contracts Accountedforas Credit Derivatives Outstanding Principal Amount FinancialGuarantyContractsAccountedforasCreditDerivativesOutstandingPrincipalAmount	6182000000	USD
CY2018Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-207000000	USD
CY2019Q1	ago	Expected Losson Credit Derivativeto Be Paid Recovered Including Representationand Warranty Liability Benefit ExpectedLossonCreditDerivativetoBePaidRecoveredIncludingRepresentationandWarrantyLiabilityBenefit	-6000000	USD
CY2018Q4	ago	Expected Losson Credit Derivativeto Be Paid Recovered Including Representationand Warranty Liability Benefit ExpectedLossonCreditDerivativetoBePaidRecoveredIncludingRepresentationandWarrantyLiabilityBenefit	-2000000	USD
CY2019Q1	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	3000000	USD
CY2018Q1	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	2000000	USD
CY2019Q1	ago	Credit Derivative Losses CreditDerivativeLosses	4000000	USD
CY2018Q1	ago	Credit Derivative Losses CreditDerivativeLosses	0	USD
CY2019Q1	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-1000000	USD
CY2018Q1	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	2000000	USD
CY2019Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-21000000	USD
CY2018Q1	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	32000000	USD
CY2019Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-22000000	USD
CY2018Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	34000000	USD
CY2019Q1	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-370000000	USD
CY2018Q4	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-407000000	USD
CY2019Q1	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	142000000	USD
CY2018Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	200000000	USD
CY2019Q1	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-228000000	USD
CY2018Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-207000000	USD
CY2019Q1	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	0	USD
CY2019Q1	ago	Variable Interest Entity Consolidated Carrying Amount Assets With Recourse VariableInterestEntityConsolidatedCarryingAmountAssetsWithRecourse	456000000	USD
CY2019Q1	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities With Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithRecourse	505000000	USD
CY2018Q4	ago	Variable Interest Entity Consolidated Carrying Amount Assets With Recourse VariableInterestEntityConsolidatedCarryingAmountAssetsWithRecourse	467000000	USD
CY2018Q4	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities With Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithRecourse	517000000	USD
CY2019Q1	ago	Variable Interest Entity Consolidated Carrying Amount Assets Without Recourse VariableInterestEntityConsolidatedCarryingAmountAssetsWithoutRecourse	104000000	USD
CY2019Q1	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities Without Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithoutRecourse	104000000	USD
CY2018Q4	ago	Variable Interest Entity Consolidated Carrying Amount Assets Without Recourse VariableInterestEntityConsolidatedCarryingAmountAssetsWithoutRecourse	102000000	USD
CY2018Q4	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities Without Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithoutRecourse	102000000	USD
CY2019Q1	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	560000000	USD
CY2019Q1	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	609000000	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	569000000	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	619000000	USD
CY2019Q1	ago	Variable Interest Entity Other Consolidated Carrying Amount Assets VariableInterestEntityOtherConsolidatedCarryingAmountAssets	88000000	USD
CY2019Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	12000000	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	185000000	USD
CY2017Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	162000000	USD
CY2019Q1	ago	Variable Interest Entity Other Consolidated Carrying Amount Liabilities VariableInterestEntityOtherConsolidatedCarryingAmountLiabilities	13000000	USD
CY2018Q4	ago	Variable Interest Entity Other Consolidated Carrying Amount Assets VariableInterestEntityOtherConsolidatedCarryingAmountAssets	87000000	USD
CY2018Q4	ago	Variable Interest Entity Other Consolidated Carrying Amount Liabilities VariableInterestEntityOtherConsolidatedCarryingAmountLiabilities	21000000	USD
CY2019Q1	ago	Variable Interest Entity Numberof Policies Monitored VariableInterestEntityNumberofPoliciesMonitored	18000	policies
CY2019Q1	ago	Variable Interest Entity Numberof Policies Monitored Not Withinthe Scopeof Asc810 VariableInterestEntityNumberofPoliciesMonitoredNotWithintheScopeofASC810	16000	policies
CY2019Q1	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	110	policies
CY2019Q1	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	92000000	USD
CY2018Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	91000000	USD
CY2019Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	100000000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	102000000	USD
CY2019Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	2000000	USD
CY2018Q1	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	2000000	USD
CY2019Q1	us-gaap	Net Investment Income NetInvestmentIncome	98000000	USD
CY2018Q1	us-gaap	Net Investment Income NetInvestmentIncome	100000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	6000000	USD
CY2018Q1	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	9000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	2000000	USD
CY2018Q1	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	5000000	USD
CY2019Q1	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	0	USD
CY2018Q1	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	1000000	USD
CY2019Q1	ago	Other Than Temporary Impairment Losses OtherThanTemporaryImpairmentLosses	13000000	USD
CY2018Q1	ago	Other Than Temporary Impairment Losses OtherThanTemporaryImpairmentLosses	11000000	USD
CY2019Q1	ago	Other Than Temporary Impairment Investments Recognizedin Other Comprehensive Income OtherThanTemporaryImpairmentInvestmentsRecognizedinOtherComprehensiveIncome	-3000000	USD
CY2018Q1	ago	Other Than Temporary Impairment Investments Recognizedin Other Comprehensive Income OtherThanTemporaryImpairmentInvestmentsRecognizedinOtherComprehensiveIncome	3000000	USD
CY2019Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	16000000	USD
CY2018Q1	us-gaap	Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet	8000000	USD
CY2019Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-12000000	USD
CY2018Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-5000000	USD
CY2018Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	7000000	USD
CY2019Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	197000000	USD
CY2018Q1	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	169000000	USD
CY2019Q1	ago	Numberof Outside Managers Managing Investment Portfolio NumberofOutsideManagersManagingInvestmentPortfolio	7	manager
CY2019Q1	us-gaap	Short Term Investments ShortTermInvestments	727000000	USD
CY2018Q4	us-gaap	Short Term Investments ShortTermInvestments	729000000	USD
CY2019Q1	us-gaap	Investments Investments	10777000000	USD
CY2018Q4	us-gaap	Investments Investments	10873000000	USD
CY2019Q1	ago	Percentageof Availableforsale Securitiesat Amortized Cost PercentageofAvailableforsaleSecuritiesatAmortizedCost	1
CY2019Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10317000000	USD
CY2019Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	464000000	USD
CY2019Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	65000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10716000000	USD
CY2019Q1	ago	Accumulated Other Comprehensive Income Loss Otherthan Temporary Impairment Not Credit Loss Before Tax Debt Securities Total AccumulatedOtherComprehensiveIncomeLossOtherthanTemporaryImpairmentNotCreditLossBeforeTaxDebtSecuritiesTotal	123000000	USD
CY2018Q4	ago	Percentageof Availableforsale Securitiesat Amortized Cost PercentageofAvailableforsaleSecuritiesatAmortizedCost	1
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	10613000000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	344000000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	139000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10818000000	USD
CY2018Q4	ago	Accumulated Other Comprehensive Income Loss Otherthan Temporary Impairment Not Credit Loss Before Tax Debt Securities Total AccumulatedOtherComprehensiveIncomeLossOtherthanTemporaryImpairmentNotCreditLossBeforeTaxDebtSecuritiesTotal	118000000	USD
CY2019Q1	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.46
CY2018Q4	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.48
CY2019Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	530000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	6000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1118000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	59000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	1648000000	USD
CY2019Q1	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	65000000	USD
CY2019Q1	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	128	Security
CY2019Q1	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	333	Security
CY2019Q1	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	456	Security
CY2019Q1	ago	Availableforsale Securitieswith Other Than Temporary Impairment Continuous Unrealized Loss Position Lessthan12 Months Number AvailableforsaleSecuritieswithOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionLessthan12MonthsNumber	5	Security
CY2019Q1	ago	Availableforsale Securitieswith Other Than Temporary Impairment Continuous Unrealized Loss Position Twelve Monthsor Longer Number AvailableforsaleSecuritieswithOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionTwelveMonthsorLongerNumber	24	Security
CY2019Q1	ago	Availableforsale Securitieswith Other Than Temporary Impairment Continuous Unrealized Loss Position Number AvailableforsaleSecuritieswithOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionNumber	28	Security
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	1643000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	34000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	1952000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	105000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Fair Value AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue	3595000000	USD
CY2018Q4	us-gaap	Available For Sale Securities Continuous Unrealized Loss Position Accumulated Loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	139000000	USD
CY2018Q4	us-gaap	Available For Sale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year AvailableForSaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsLessThanOneYear	417	Security
CY2018Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear	608	Security
CY2018Q4	us-gaap	Availableforsale Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	997	Security
CY2018Q4	ago	Availableforsale Securitieswith Other Than Temporary Impairment Continuous Unrealized Loss Position Lessthan12 Months Number AvailableforsaleSecuritieswithOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionLessthan12MonthsNumber	22	Security
CY2018Q4	ago	Availableforsale Securitieswith Other Than Temporary Impairment Continuous Unrealized Loss Position Twelve Monthsor Longer Number AvailableforsaleSecuritieswithOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionTwelveMonthsorLongerNumber	22	Security
CY2018Q4	ago	Availableforsale Securitieswith Other Than Temporary Impairment Continuous Unrealized Loss Position Number AvailableforsaleSecuritieswithOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionNumber	42	Security
CY2019Q1	ago	Available For Sale Securities Continuous Unrealized Loss Position Greater Than10 Percent Of Book Value Twelve Months Or Longer Number AvailableForSaleSecuritiesContinuousUnrealizedLossPositionGreaterThan10PercentOfBookValueTwelveMonthsOrLongerNumber	37	Security
CY2018Q4	ago	Available For Sale Securities Continuous Unrealized Loss Position Greater Than10 Percent Of Book Value Twelve Months Or Longer Number AvailableForSaleSecuritiesContinuousUnrealizedLossPositionGreaterThan10PercentOfBookValueTwelveMonthsOrLongerNumber	38	Security
CY2019Q1	ago	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Greater Than10 Percent Book Value Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerGreaterThan10PercentBookValueAggregateLosses	33000000	USD
CY2018Q4	ago	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Greater Than10 Percent Book Value Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerGreaterThan10PercentBookValueAggregateLosses	43000000	USD
CY2019Q1	us-gaap	Assets Held In Trust AssetsHeldInTrust	269000000	USD
CY2018Q4	us-gaap	Assets Held In Trust AssetsHeldInTrust	266000000	USD
CY2019Q1	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	9000000	USD
CY2018Q1	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	35000000	USD
CY2019Q1	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	5000000	USD
CY2018Q1	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	6000000	USD
CY2019Q1	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	0	USD
CY2018Q1	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-7000000	USD
CY2019Q1	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1000000	USD
CY2018Q1	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2000000	USD
CY2019Q1	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1000000	USD
CY2018Q1	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-4000000	USD
CY2019Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
CY2018Q1	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1000000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4000000	USD
CY2019Q1	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	1000000	USD
CY2018Q1	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	0	USD
CY2019Q1	ago	Effective Income Tax Rate Reconciliation Nondeductible Expense Deferred Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDeferredCompensationAmount	-2000000	USD
CY2018Q1	ago	Effective Income Tax Rate Reconciliation Nondeductible Expense Deferred Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDeferredCompensationAmount	-1000000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20000000	USD
CY2019Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.078
CY2018Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.093
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	58000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	217000000	USD
CY2019Q1	us-gaap	Revenues Revenues	195000000	USD
CY2018Q1	us-gaap	Revenues Revenues	293000000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	33000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	68000000	USD
CY2019Q1	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	28000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	22000000	USD
CY2019Q1	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Tax Credit Realized TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized	23000000	USD
CY2019Q1	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	36000000	USD
CY2019Q1	ago	Deferred Tax Assets Realization Assessment Period For Which Cumulative Operating Income Considered DeferredTaxAssetsRealizationAssessmentPeriodForWhichCumulativeOperatingIncomeConsidered	P3Y
CY2019Q1	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1000000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2019Q1	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16000000	USD
CY2019Q1	us-gaap	Direct Premiums Written DirectPremiumsWritten	39000000	USD
CY2018Q1	us-gaap	Direct Premiums Written DirectPremiumsWritten	73000000	USD
CY2019Q1	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	0	USD
CY2018Q1	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	0	USD
CY2019Q1	us-gaap	Ceded Premiums Written CededPremiumsWritten	-15000000	USD
CY2018Q1	us-gaap	Ceded Premiums Written CededPremiumsWritten	11000000	USD
CY2019Q1	us-gaap	Premiums Written Net PremiumsWrittenNet	54000000	USD
CY2018Q1	us-gaap	Premiums Written Net PremiumsWrittenNet	62000000	USD
CY2019Q1	us-gaap	Direct Premiums Earned DirectPremiumsEarned	105000000	USD
CY2018Q1	us-gaap	Direct Premiums Earned DirectPremiumsEarned	143000000	USD
CY2019Q1	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	15000000	USD
CY2018Q1	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	5000000	USD
CY2019Q1	us-gaap	Ceded Premiums Earned CededPremiumsEarned	2000000	USD
CY2018Q1	us-gaap	Ceded Premiums Earned CededPremiumsEarned	3000000	USD
CY2019Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	118000000	USD
CY2018Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	145000000	USD
CY2019Q1	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	54000000	USD
CY2018Q1	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	-14000000	USD
CY2019Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	1000000	USD
CY2018Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	-3000000	USD
CY2019Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	9000000	USD
CY2018Q1	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	1000000	USD
CY2019Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	46000000	USD
CY2018Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	-18000000	USD
CY2019Q1	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	-7000000	USD
CY2018Q4	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	-26000000	USD
CY2019Q1	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	19000000	USD
CY2018Q4	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	14000000	USD
CY2019Q1	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	1979000000	USD
CY2018Q4	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	2389000000	USD
CY2019Q1	ago	Non Financial Guaranty Exposure Ceded Par Outstanding NonFinancialGuarantyExposureCededParOutstanding	245000000	USD
CY2018Q4	ago	Non Financial Guaranty Exposure Ceded Par Outstanding NonFinancialGuarantyExposureCededParOutstanding	239000000	USD
CY2018Q1	ago	Increase Decrease In Unearned Premiums Due To Commutations IncreaseDecreaseInUnearnedPremiumsDueToCommutations	4000000	USD
CY2018Q1	ago	Increase Decrease In Net Par Due To Commutations IncreaseDecreaseInNetParDueToCommutations	42000000	USD
CY2019Q1	ago	Operating Lease Numberof Square Feet OperatingLeaseNumberofSquareFeet	103500	sqft
CY2019Q1	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	95000000	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	69000000	USD
CY2019Q1	ago	Derecognized Deferred Rent And Lease Incentive Liabilities DerecognizedDeferredRentAndLeaseIncentiveLiabilities	26000000	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	67000000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	93000000	USD
CY2019Q1	us-gaap	Lease Cost LeaseCost	2000000	USD
CY2019Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	2000000	USD
CY2019Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y6M
CY2019Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.030
CY2019Q1	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	6000000	USD
CY2019Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	9000000	USD
CY2019Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	8000000	USD
CY2019Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	8000000	USD
CY2019Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	9000000	USD
CY2019Q1	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	72000000	USD
CY2019Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	112000000	USD
CY2019Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	19000000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	93000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	9000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	9000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	8000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	8000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	9000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	72000000	USD
CY2019Q1	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1454000000	USD
CY2019Q1	us-gaap	Long Term Debt LongTermDebt	1232000000	USD
CY2018Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1457000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	1233000000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	54000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	197000000	USD
CY2019Q1	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	USD
CY2018Q1	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1000000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	54000000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	196000000	USD
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	103000000.0	shares
CY2018Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	115200000	shares
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	54000000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	196000000	USD
CY2019Q1	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2018Q1	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	54000000	USD
CY2018Q1	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	196000000	USD
CY2019Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	103000000.0	shares
CY2018Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	115200000	shares
CY2019Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1000000.0	shares
CY2018Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1400000	shares
CY2019Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	104000000.0	shares
CY2018Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	116600000	shares
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.68
CY2019Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	200000	shares
CY2019Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	156000000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	168000000	USD
CY2017Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	-32000000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-131000000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-126000000	USD
CY2019Q1	us-gaap	Investments And Cash InvestmentsAndCash	10900000000	USD
CY2019Q1	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2019Q1	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	897000000	USD
CY2019Q1	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	104000000	USD
CY2019Q1	us-gaap	Due From Affiliates DueFromAffiliates	0	USD
CY2019Q1	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	560000000	USD
CY2019Q1	us-gaap	Dividends Receivable DividendsReceivable	0	USD
CY2019Q1	ago	Other Assets Consolidating OtherAssetsConsolidating	1090000000	USD
CY2019Q1	us-gaap	Assets Assets	13551000000	USD
CY2019Q1	us-gaap	Unearned Premiums UnearnedPremiums	3437000000	USD
CY2019Q1	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1032000000	USD
CY2019Q1	us-gaap	Long Term Debt LongTermDebt	1232000000	USD
CY2019Q1	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	0	USD
CY2019Q1	us-gaap	Credit Risk Derivative Liabilities At Fair Value CreditRiskDerivativeLiabilitiesAtFairValue	229000000	USD
CY2019Q1	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	609000000	USD
CY2019Q1	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	0	USD
CY2019Q1	ago	Other Liabilities Consolidating OtherLiabilitiesConsolidating	343000000	USD
CY2019Q1	us-gaap	Liabilities Liabilities	6882000000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	6669000000	USD
CY2019Q1	us-gaap	Minority Interest MinorityInterest	0	USD
CY2019Q1	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6669000000	USD
CY2019Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13551000000	USD
CY2018Q4	us-gaap	Investments And Cash InvestmentsAndCash	10977000000	USD
CY2018Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	0	USD
CY2018Q4	us-gaap	Premiums Receivable At Carrying Value PremiumsReceivableAtCarryingValue	904000000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	105000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	68000000	USD
CY2018Q4	us-gaap	Due From Affiliates DueFromAffiliates	0	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	569000000	USD
CY2018Q4	us-gaap	Dividends Receivable DividendsReceivable	0	USD
CY2018Q4	ago	Other Assets Consolidating OtherAssetsConsolidating	980000000	USD
CY2018Q4	us-gaap	Assets Assets	13603000000	USD
CY2018Q4	us-gaap	Unearned Premiums UnearnedPremiums	3512000000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1177000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	1233000000	USD
CY2018Q4	us-gaap	Due To Affiliate Current And Noncurrent DueToAffiliateCurrentAndNoncurrent	0	USD
CY2018Q4	us-gaap	Credit Risk Derivative Liabilities At Fair Value CreditRiskDerivativeLiabilitiesAtFairValue	209000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	0	USD
CY2018Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	619000000	USD
CY2018Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	0	USD
CY2018Q4	ago	Other Liabilities Consolidating OtherLiabilitiesConsolidating	298000000	USD
CY2018Q4	us-gaap	Liabilities Liabilities	7048000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	6555000000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	0	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6555000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	13603000000	USD
CY2019Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	118000000	USD
CY2019Q1	us-gaap	Net Investment Income NetInvestmentIncome	98000000	USD
CY2019Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-12000000	USD
CY2019Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-22000000	USD
CY2019Q1	ago	Other Income Consolidating OtherIncomeConsolidating	13000000	USD
CY2019Q1	us-gaap	Revenues Revenues	195000000	USD
CY2019Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	46000000	USD
CY2019Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	6000000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	23000000	USD
CY2019Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	64000000	USD
CY2019Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	139000000	USD
CY2019Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2000000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	58000000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4000000	USD
CY2019Q1	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	54000000	USD
CY2019Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	54000000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	222000000	USD
CY2018Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	145000000	USD
CY2018Q1	us-gaap	Net Investment Income NetInvestmentIncome	100000000	USD
CY2018Q1	ago	Other Income Consolidating OtherIncomeConsolidating	19000000	USD
CY2018Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-5000000	USD
CY2018Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	34000000	USD
CY2018Q1	us-gaap	Revenues Revenues	293000000	USD
CY2018Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	-18000000	USD
CY2018Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	5000000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	24000000	USD
CY2018Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	65000000	USD
CY2018Q1	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	76000000	USD
CY2018Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	217000000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20000000	USD
CY2018Q1	us-gaap	Income Loss From Subsidiaries Net Of Tax IncomeLossFromSubsidiariesNetOfTax	0	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	197000000	USD
CY2018Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	197000000	USD
CY2018Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	71000000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-332000000	USD
CY2019Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	196000000	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	471000000	USD
CY2019Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	177000000	USD
CY2019Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	107000000	USD
CY2019Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2000000	USD
CY2019Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	67000000	USD
CY2019Q1	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	-25000000	USD
CY2019Q1	ago	Proceeds From Financial Guaranty Variable Interest Entities Assets ProceedsFromFinancialGuarantyVariableInterestEntitiesAssets	26000000	USD
CY2019Q1	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-27000000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	492000000	USD
CY2019Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	20000000	USD
CY2019Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	80000000	USD
CY2019Q1	ago	Payments For Repurchase Of Common Stock For Tax Withholdings PaymentsForRepurchaseOfCommonStockForTaxWithholdings	15000000	USD
CY2019Q1	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	25000000	USD
CY2019Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	3000000	USD
CY2019Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1000000	USD
CY2019Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-142000000	USD
CY2019Q1	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1000000	USD
CY2019Q1	ago	Increase Decreasein Cashand Restricted Cash IncreaseDecreaseinCashandRestrictedCash	19000000	USD
CY2018Q4	ago	Cashand Restricted Cash CashandRestrictedCash	104000000	USD
CY2019Q1	ago	Cashand Restricted Cash CashandRestrictedCash	123000000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	27000000	USD
CY2018Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	411000000	USD
CY2018Q1	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	409000000	USD
CY2018Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	225000000	USD
CY2018Q1	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	47000000	USD
CY2018Q1	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	0	USD
CY2018Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	45000000	USD
CY2018Q1	us-gaap	Payments For Proceeds From Short Term Investments PaymentsForProceedsFromShortTermInvestments	114000000	USD
CY2018Q1	ago	Proceeds From Financial Guaranty Variable Interest Entities Assets ProceedsFromFinancialGuarantyVariableInterestEntitiesAssets	33000000	USD
CY2018Q1	us-gaap	Payments To Acquire Business Three Net Of Cash Acquired PaymentsToAcquireBusinessThreeNetOfCashAcquired	0	USD
CY2018Q1	ago	Paymentsfor Proceedsfrom Maturityof Other Invested Assetand Other PaymentsforProceedsfromMaturityofOtherInvestedAssetandOther	-14000000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	126000000	USD
CY2018Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18000000	USD
CY2018Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	100000000	USD
CY2018Q1	ago	Payments For Repurchase Of Common Stock For Tax Withholdings PaymentsForRepurchaseOfCommonStockForTaxWithholdings	12000000	USD
CY2018Q1	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	33000000	USD
CY2018Q1	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	19000000	USD
CY2018Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1000000	USD
CY2018Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-181000000	USD
CY2018Q1	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	1000000	USD
CY2018Q1	ago	Increase Decreasein Cashand Restricted Cash IncreaseDecreaseinCashandRestrictedCash	-27000000	USD
CY2017Q4	ago	Cashand Restricted Cash CashandRestrictedCash	144000000	USD
CY2018Q1	ago	Cashand Restricted Cash CashandRestrictedCash	117000000	USD

Files In Submission

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$AGO
ASSURED GUARANTY LTD Stock $ago

2019 Q1 Form 10-Q Financial Statement

#000127381319000025 Filed on May 10, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AGO ASSURED GUARANTY LTD Stock $ago

2019 Q1 Form 10-Q Financial Statement

#000127381319000025 Filed on May 10, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AGO
ASSURED GUARANTY LTD Stock $ago