$AGO
ASSURED GUARANTY LTD Stock $ago

$ago Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000127381320000006 Filed on February 28, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$82.00M	$98.00M	$275.0M
YoY Change	-16.33%	2.08%	-55.86%
Cost Of Revenue	$18.00M	$21.00M	$17.00M
YoY Change	-14.29%	-38.24%	-92.38%
Gross Profit	$64.00M	$77.00M	$258.0M
YoY Change	-16.88%	24.19%	-35.5%
Gross Profit Margin	78.05%	78.57%	93.82%
Selling, General & Admin	$178.0M
YoY Change
% of Gross Profit	278.13%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$5.000M	$4.000M	$3.000M
YoY Change	25.0%	-33.33%	-40.0%
% of Gross Profit	7.81%	5.19%	1.16%
Operating Expenses	$115.0M	$90.00M	$76.00M
YoY Change	27.78%	-10.89%	-73.43%
Operating Profit	-$51.00M	-$13.00M	$182.0M
YoY Change	292.31%	-66.67%	59.65%
Interest Expense	$22.00M	$23.00M	$23.00M
YoY Change	-4.35%	-4.17%	-4.17%
% of Operating Profit			12.64%
Other Income/Expense, Net
YoY Change
Pretax Income	$138.0M	$101.0M	$175.0M
YoY Change	36.63%	-35.26%	-44.09%
Income Tax	$2.000M	$13.00M	$14.00M
% Of Pretax Income	1.45%	12.87%	8.0%
Net Earnings	$137.0M	$88.00M	$161.0M
YoY Change	55.68%	69.23%	-22.6%
Net Earnings / Revenue	167.07%	89.8%	58.55%
Basic Earnings Per Share	$1.43	$0.84	$1.48
Diluted Earnings Per Share	$1.42	$0.83	$1.47
COMMON SHARES
Basic Shares Outstanding	95.39M shares	105.7M shares	108.0M shares
Diluted Shares Outstanding			109.3M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$183.0M	$104.0M	$82.00M
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	$100.0M
YoY Change
Goodwill	$117.0M	$0.00
YoY Change
Intangibles
YoY Change
Long-Term Investments	$10.81B	$10.87B	$11.03B
YoY Change	-0.56%	-4.58%	-4.88%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$14.33B	$13.60B	$13.74B
YoY Change	5.32%	-5.75%	-6.21%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$130.0M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$130.0M
YoY Change
LONG-TERM LIABILITIES
Long-Term Debt	$1.235B	$1.233B	$1.249B
YoY Change	0.16%	-4.57%	-3.33%
Other Long-Term Liabilities	$1.523B	$1.126B	$1.222B
YoY Change	35.26%	-14.83%	-19.13%
Total Long-Term Liabilities	$2.758B	$2.359B	$2.471B
YoY Change	16.91%	-9.76%	-11.84%
TOTAL LIABILITIES
Total Short-Term Liabilities	$130.0M
Total Long-Term Liabilities	$2.758B	$2.359B	$2.471B
Total Liabilities	$7.674B	$7.048B	$7.156B
YoY Change	8.88%	-7.19%	-7.91%
SHAREHOLDERS EQUITY
Retained Earnings	$6.295B	$6.374B	$6.303B
YoY Change	-1.24%	8.18%	6.6%
Common Stock	$1.000M	$87.00M	$201.0M
YoY Change	-98.85%	-84.84%	-68.5%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.639B	$6.555B	$6.583B
YoY Change
Total Liabilities & Shareholders Equity	$14.33B	$13.60B	$13.74B
YoY Change	5.32%	-5.75%	-6.21%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$137.0M	$88.00M	$161.0M
YoY Change	55.68%	69.23%	-22.6%
Depreciation, Depletion And Amortization	$5.000M	$4.000M	$3.000M
YoY Change	25.0%	-33.33%	-40.0%
Cash From Operating Activities	-$144.0M	$110.0M	-$92.00M
YoY Change	-230.91%	39.24%	-158.97%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	$99.00M	$103.0M	$208.0M
YoY Change	-3.88%	-8.85%	-261.24%
Cash From Investing Activities	$99.00M	$103.0M	$208.0M
YoY Change	-3.88%	-8.85%	-261.24%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-6.000M	-189.0M	-222.0M
YoY Change	-96.83%	56.2%	41.4%
NET CHANGE
Cash From Operating Activities	-144.0M	110.0M	-92.00M
Cash From Investing Activities	99.00M	103.0M	208.0M
Cash From Financing Activities	-6.000M	-189.0M	-222.0M
Net Change In Cash	-51.00M	24.00M	-106.0M
YoY Change	-312.5%	-66.2%	-18.46%
FREE CASH FLOW
Cash From Operating Activities	-$144.0M	$110.0M	-$92.00M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2019Q4	ago	Liabilitiesof Consolidated Investment Vehicles Fair Value Disclosure LiabilitiesofConsolidatedInvestmentVehiclesFairValueDisclosure	481000000	USD
CY2018Q4	ago	Non Income Producing Investments NonIncomeProducingInvestments	0	USD
CY2019Q4	ago	Non Income Producing Investments NonIncomeProducingInvestments	0	USD
CY2017	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	2000000	USD
CY2018	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	-2000000	USD
CY2019	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	0	USD
CY2017	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Excluding Other Than Temporary Impairment Losses Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodExcludingOtherThanTemporaryImpairmentLossesTax	27000000	USD
CY2018	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Excluding Other Than Temporary Impairment Losses Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodExcludingOtherThanTemporaryImpairmentLossesTax	-32000000	USD
CY2019	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Excluding Other Than Temporary Impairment Losses Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodExcludingOtherThanTemporaryImpairmentLossesTax	46000000	USD
CY2018Q4	ago	Other Investments Fair Value Disclosure OtherInvestmentsFairValueDisclosure	7000000	USD
CY2019Q4	ago	Other Investments Fair Value Disclosure OtherInvestmentsFairValueDisclosure	6000000	USD
CY2019Q4	ago	Percentage Of Cds Contracts Fair Valued Using Minimum Premium PercentageOfCdsContractsFairValuedUsingMinimumPremium	0.00
CY2019	ago	Sharebased Compensation Arrangementby Sharebased Payment Award Fair Value Assumptions Options Excluding Performance Stock Options Award Vesting Period SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsOptionsExcludingPerformanceStockOptionsAwardVestingPeriod	P3Y
CY2019	dei	Amendment Flag AmendmentFlag	false
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CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001273813
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CY2018Q4	us-gaap	Accounts Receivable Related Parties AccountsReceivableRelatedParties	0	USD
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CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	0	USD
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CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.57
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CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	93274987	shares
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CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	93274987	shares
CY2018Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	2000000	USD
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CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	001-32141
CY2019	dei	Entity Registrant Name EntityRegistrantName	ASSURED GUARANTY LTD
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	D0
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-0429991
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	30 Woodbourne Avenue
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Hamilton
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	HM 08
CY2019	dei	Entity Address Country EntityAddressCountry	BM
CY2019	dei	City Area Code CityAreaCode	441
CY2019	dei	Local Phone Number LocalPhoneNumber	279-5700
CY2019	dei	Security12b Title Security12bTitle	Common Shares
CY2019	dei	Trading Symbol TradingSymbol	AGO
CY2019	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
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CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	125000000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	96000000	USD
CY2017	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	101000000	USD
CY2019	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	503000000	USD
CY2018	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	422000000	USD
CY2017	us-gaap	Benefits Losses And Expenses BenefitsLossesAndExpenses	748000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	460000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	579000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	991000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	464000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	580000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	991000000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-2000000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-15000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	11000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	65000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	74000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	250000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	261000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	401000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	730000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	730000000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.04
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.73
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.05
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.00
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.68
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.96
CY2019	us-gaap	Profit Loss ProfitLoss	401000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	730000000	USD
CY2019	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities With No Other Than Temporary Impairment Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax	293000000	USD
CY2018	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities With No Other Than Temporary Impairment Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax	-215000000	USD
CY2017	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities With No Other Than Temporary Impairment Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax	64000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	46000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	26000000	USD
CY2017	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	-89000000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	247000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-241000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	153000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	2000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	0	USD
CY2019	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	-2000000	USD
CY2018	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	-8000000	USD
CY2017	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	14000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	249000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-247000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	167000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	650000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	274000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	897000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-1000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	651000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	274000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	897000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6504000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	730000000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	70000000	USD
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	501000000	USD
CY2017	ago	Stock Issued During Period Value Sharebased Compensationand Other StockIssuedDuringPeriodValueSharebasedCompensationandOther	10000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	167000000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6839000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	71000000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	500000000	USD
CY2018	ago	Stock Issued During Period Value Sharebased Compensationand Other StockIssuedDuringPeriodValueSharebasedCompensationandOther	13000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-247000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6555000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	74000000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	500000000	USD
CY2019	ago	Stock Issued During Period Value Sharebased Compensationand Other StockIssuedDuringPeriodValueSharebasedCompensationandOther	7000000	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	6000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	249000000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6645000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	401000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	730000000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-34000000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-36000000	USD
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-26000000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	35000000	USD
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	31000000	USD
CY2017	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	46000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	65000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	74000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	250000000	USD
CY2019	ago	Realized Noncash Investments Gains Losses RealizedNoncashInvestmentsGainsLosses	22000000	USD
CY2018	ago	Realized Noncash Investments Gains Losses RealizedNoncashInvestmentsGainsLosses	-32000000	USD
CY2017	ago	Realized Noncash Investments Gains Losses RealizedNoncashInvestmentsGainsLosses	40000000	USD
CY2019	ago	Bargain Purchase Gain And Settlementof Preexisting Relationship BargainPurchaseGainAndSettlementofPreexistingRelationship	0	USD
CY2018	ago	Bargain Purchase Gain And Settlementof Preexisting Relationship BargainPurchaseGainAndSettlementofPreexistingRelationship	0	USD
CY2017	ago	Bargain Purchase Gain And Settlementof Preexisting Relationship BargainPurchaseGainAndSettlementofPreexistingRelationship	58000000	USD
CY2019	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	388000000	USD
CY2018	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	6000000	USD
CY2017	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	69000000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-20000000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-58000000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-90000000	USD
CY2019	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	224000000	USD
CY2018	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	39000000	USD
CY2017	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	-424000000	USD
CY2019	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-528000000	USD
CY2018	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-173000000	USD
CY2017	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	142000000	USD
CY2019	ago	Increase Decrease In Financial Guaranty Variable Interest Entities Assets And Liabilities Net IncreaseDecreaseInFinancialGuarantyVariableInterestEntitiesAssetsAndLiabilitiesNet	27000000	USD
CY2018	ago	Increase Decrease In Financial Guaranty Variable Interest Entities Assets And Liabilities Net IncreaseDecreaseInFinancialGuarantyVariableInterestEntitiesAssetsAndLiabilitiesNet	5000000	USD
CY2017	ago	Increase Decrease In Financial Guaranty Variable Interest Entities Assets And Liabilities Net IncreaseDecreaseInFinancialGuarantyVariableInterestEntitiesAssetsAndLiabilitiesNet	15000000	USD
CY2019	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	1000000	USD
CY2018	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	62000000	USD
CY2017	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	144000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	0	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	21000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	9000000	USD
CY2019	ago	Purchasesof Securitiesof Consolidated Investment Vehicles PurchasesofSecuritiesofConsolidatedInvestmentVehicles	267000000	USD
CY2018	ago	Purchasesof Securitiesof Consolidated Investment Vehicles PurchasesofSecuritiesofConsolidatedInvestmentVehicles	0	USD
CY2017	ago	Purchasesof Securitiesof Consolidated Investment Vehicles PurchasesofSecuritiesofConsolidatedInvestmentVehicles	0	USD
CY2019	ago	Increase Decreasein Other Operating Activitiesof Consolidated Investment Vehicles IncreaseDecreaseinOtherOperatingActivitiesofConsolidatedInvestmentVehicles	15000000	USD
CY2018	ago	Increase Decreasein Other Operating Activitiesof Consolidated Investment Vehicles IncreaseDecreaseinOtherOperatingActivitiesofConsolidatedInvestmentVehicles	0	USD
CY2017	ago	Increase Decreasein Other Operating Activitiesof Consolidated Investment Vehicles IncreaseDecreaseinOtherOperatingActivitiesofConsolidatedInvestmentVehicles	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-509000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	462000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	433000000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	873000000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1881000000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2552000000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1805000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1180000000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1701000000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	781000000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	962000000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	821000000	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	229000000	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	243000000	USD
CY2017	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	255000000	USD
CY2019	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2000000	USD
CY2018	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	23000000	USD
CY2017	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	102000000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	316000000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	207000000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	191000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-623000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-84000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	36000000	USD
CY2019	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	139000000	USD
CY2018	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	116000000	USD
CY2017	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	147000000	USD
CY2019	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	51000000	USD
CY2018	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	0	USD
CY2017	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	145000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	-95000000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	0	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	0	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	85000000	USD
CY2019	ago	Proceeds From Saleof Other Invested Assets ProceedsFromSaleofOtherInvestedAssets	36000000	USD
CY2018	ago	Proceeds From Saleof Other Invested Assets ProceedsFromSaleofOtherInvestedAssets	38000000	USD
CY2017	ago	Proceeds From Saleof Other Invested Assets ProceedsFromSaleofOtherInvestedAssets	2000000	USD
CY2019	ago	Paymentsfor Purchaseof Other Invested Assets PaymentsforPurchaseofOtherInvestedAssets	88000000	USD
CY2018	ago	Paymentsfor Purchaseof Other Invested Assets PaymentsforPurchaseofOtherInvestedAssets	20000000	USD
CY2017	ago	Paymentsfor Purchaseof Other Invested Assets PaymentsforPurchaseofOtherInvestedAssets	23000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	5000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1169000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	297000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	345000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	74000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	71000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	70000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	500000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	500000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	501000000	USD
CY2019	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	181000000	USD
CY2018	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	116000000	USD
CY2017	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	157000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	101000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	30000000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-15000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-7000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-8000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	482000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	ago	Repaymentof Warehouse Loansand Equity RepaymentofWarehouseLoansandEquity	306000000	USD
CY2018	ago	Repaymentof Warehouse Loansand Equity RepaymentofWarehouseLoansandEquity	0	USD
CY2017	ago	Repaymentof Warehouse Loansand Equity RepaymentofWarehouseLoansandEquity	0	USD
CY2019	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	18000000	USD
CY2018	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	0	USD
CY2017	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	0	USD
CY2019	ago	Distributions To Redeemable Noncontrolling Interests From Investment Vehicles DistributionsToRedeemableNoncontrollingInterestsFromInvestmentVehicles	4000000	USD
CY2018	ago	Distributions To Redeemable Noncontrolling Interests From Investment Vehicles DistributionsToRedeemableNoncontrollingInterestsFromInvestmentVehicles	0	USD
CY2017	ago	Distributions To Redeemable Noncontrolling Interests From Investment Vehicles DistributionsToRedeemableNoncontrollingInterestsFromInvestmentVehicles	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-584000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-795000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-766000000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	3000000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-4000000	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	5000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	79000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-40000000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	17000000	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
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	127000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	183000000	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
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-4000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	10000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	84000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	99000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	77000000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	188000000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	4000000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	32000000	USD
CY2019	ago	Noncashor Part Noncash Acquisition Investments Sold NoncashorPartNoncashAcquisitionInvestmentsSold	44000000	USD
CY2018	ago	Noncashor Part Noncash Acquisition Investments Sold NoncashorPartNoncashAcquisitionInvestmentsSold	0	USD
CY2017	ago	Noncashor Part Noncash Acquisition Investments Sold NoncashorPartNoncashAcquisitionInvestmentsSold	0	USD
CY2019Q4	us-gaap	Cash Cash	169000000	USD
CY2018Q4	us-gaap	Cash Cash	104000000	USD
CY2017Q4	us-gaap	Cash Cash	144000000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2017Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2019Q4	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	14000000	USD
CY2018Q4	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	0	USD
CY2017Q4	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	0	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	183000000	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
CY2019Q4	ago	Number Of Holding Companies Having Outstanding Public Debt NumberOfHoldingCompaniesHavingOutstandingPublicDebt	2	Company
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2019Q4	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2019	us-gaap	Net Investment Income NetInvestmentIncome	378000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	89000000	USD
CY2019	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	48000000	USD
CY2019	ago	Revenue Including Adjustments RevenueIncludingAdjustments	964000000	USD
CY2019	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	964000000	USD
CY2019	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	516000000	USD
CY2019	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	448000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4000000	USD
CY2019	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	452000000	USD
CY2019	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	62000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1000000	USD
CY2019	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	391000000	USD
CY2019	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	22000000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	-10000000	USD
CY2019	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	-22000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	22000000	USD
CY2019	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	12000000	USD
CY2019	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	-1000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2018	us-gaap	Net Investment Income NetInvestmentIncome	395000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	94000000	USD
CY2018	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	41000000	USD
CY2018	ago	Revenue Including Adjustments RevenueIncludingAdjustments	959000000	USD
CY2018	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	959000000	USD
CY2018	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	431000000	USD
CY2018	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	528000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2018	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	529000000	USD
CY2018	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	47000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	482000000	USD
CY2018	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-32000000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	101000000	USD
CY2018	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	14000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	-32000000	USD
CY2018	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	51000000	USD
CY2018	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	-12000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2017	us-gaap	Net Investment Income NetInvestmentIncome	417000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	97000000	USD
CY2017	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	41000000	USD
CY2017	ago	Revenue Including Adjustments RevenueIncludingAdjustments	1558000000	USD
CY2017	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	1558000000	USD
CY2017	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	705000000	USD
CY2017	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	853000000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2017	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	853000000	USD
CY2017	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	192000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2017	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	661000000	USD
CY2017	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	40000000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	43000000	USD
CY2017	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	-2000000	USD
CY2017	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	57000000	USD
CY2017	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	138000000	USD
CY2017	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	-69000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	-12000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	730000000	USD
CY2017	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	1558000000	USD
CY2019	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	964000000	USD
CY2018	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	959000000	USD
CY2019	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	964000000	USD
CY2018	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	959000000	USD
CY2017	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	1558000000	USD
CY2019	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	516000000	USD
CY2018	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	431000000	USD
CY2017	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	705000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Secondto Pay Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountSecondtoPayAmountNet	6600000000	USD
CY2018Q4	ago	Insured Financial Obligations Outstanding Principal Amount Secondto Pay Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountSecondtoPayAmountNet	6700000000	USD
CY2019Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	375776000000	USD
CY2018Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	375080000000	USD
CY2019Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	374130000000	USD
CY2018Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	371586000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2019Q4	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
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Gross InsuredFinancialObligationsOutstandingPrincipalAmountGross	238156000000	USD
CY2018Q4	ago	Insured Financial Obligations Outstanding Principal Amount Gross InsuredFinancialObligationsOutstandingPrincipalAmountGross	244191000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2018Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	241802000000	USD
CY2019Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Zeroto Five Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountZerotoFiveYears	59380000000	USD
CY2019Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Fiveto Ten Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFivetoTenYears	50352000000	USD
CY2019Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Tento Fifteen Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTentoFifteenYears	44818000000	USD
CY2019Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Fifteento Twenty Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFifteentoTwentyYears	35518000000	USD
CY2019Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Twentyand Above Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTwentyandAboveYears	46739000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2018Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	241802000000	USD
CY2019Q4	ago	Insured Financial Obligations Numberof Contracts InsuredFinancialObligationsNumberofContracts	8849	risk
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amountas Percentageof Total Outstanding Principal InsuredFinancialObligationsOutstandingPrincipalAmountasPercentageofTotalOutstandingPrincipal	1.000
CY2019	ago	Insured Financial Obligations Insured Credit Performanceof Guaranteed Obligations Term InsuredFinancialObligationsInsuredCreditPerformanceofGuaranteedObligationsTerm	P30Y
CY2019	ago	Insured Financial Obligations Claim Liability Weighted Average Risk Free Discount Rate InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0194
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
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	22000000	USD
CY2018	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	36000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	-11000000	USD
CY2018	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	-17000000	USD
CY2018	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	-24000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-1000000	USD
CY2018	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-5000000	USD
CY2019	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	445000000	USD
CY2018	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	246000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-1000000	USD
CY2019	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	445000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2017Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1303000000	USD
CY2018	ago	Guarantor Obligations Net Expected Loss To Be Paid After Recoveries For Representations And Warranties On Business Combinations GuarantorObligationsNetExpectedLossToBePaidAfterRecoveriesForRepresentationsAndWarrantiesOnBusinessCombinations	131000000	USD
CY2018	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-5000000	USD
CY2018	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	246000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2019	ago	Reinsurance Recoverables Periodafter Endof Reporting Periodfor Settlementof Ceded Paid Losses ReinsuranceRecoverablesPeriodafterEndofReportingPeriodforSettlementofCededPaidLosses	P45D
CY2019	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	35000000	USD
CY2018	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	28000000	USD
CY2019Q4	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	33000000	USD
CY2018Q4	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	31000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-1000000	USD
CY2018	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-5000000	USD
CY2019	ago	Liquidation Rate Review Period LiquidationRateReviewPeriod	P12M
CY2019Q4	ago	Additional Loss Recovery Assumption AdditionalLossRecoveryAssumption	0.20
CY2018Q4	ago	Additional Loss Recovery Assumption AdditionalLossRecoveryAssumption	0.10
CY2019	ago	Additional Loss Recovery Assumption Recovery Period AdditionalLossRecoveryAssumptionRecoveryPeriod	P5Y
CY2019Q4	ago	Loss Recovery Assumption Additional Increasein Recovery Projection Percent LossRecoveryAssumptionAdditionalIncreaseinRecoveryProjectionPercent	0.30
CY2019Q4	ago	Loss Recovery Assumption Additional Increasein Recovery Projection Economic Benefit LossRecoveryAssumptionAdditionalIncreaseinRecoveryProjectionEconomicBenefit	57000000	USD
CY2019Q4	ago	Loss Recovery Assumption Additional Decreasein Recovery Projection Percent LossRecoveryAssumptionAdditionalDecreaseinRecoveryProjectionPercent	0.10
CY2019Q4	ago	Loss Recovery Assumption Additional Decreasein Recovery Projection Economic Loss LossRecoveryAssumptionAdditionalDecreaseinRecoveryProjectionEconomicLoss	57000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	331000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	367000000	USD
CY2017	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	385000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	122000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	159000000	USD
CY2017	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	286000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-17000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-18000000	USD
CY2017	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-17000000	USD
CY2019	us-gaap	Premiums Earned Net Financial Guarantee Insurance Contracts PremiumsEarnedNetFinancialGuaranteeInsuranceContracts	470000000	USD
CY2018	us-gaap	Premiums Earned Net Financial Guarantee Insurance Contracts PremiumsEarnedNetFinancialGuaranteeInsuranceContracts	544000000	USD
CY2017	us-gaap	Premiums Earned Net Financial Guarantee Insurance Contracts PremiumsEarnedNetFinancialGuaranteeInsuranceContracts	688000000	USD
CY2019	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	6000000	USD
CY2018	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	4000000	USD
CY2017	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	2000000	USD
CY2019	us-gaap	Premiums Earned Net PremiumsEarnedNet	476000000	USD
CY2018	us-gaap	Premiums Earned Net PremiumsEarnedNet	548000000	USD
CY2017	us-gaap	Premiums Earned Net PremiumsEarnedNet	690000000	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
CY2016Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	576000000	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
CY2016Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	0	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
CY2016Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	576000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Premium Receivable Acquired From Business Acquisition FinancialGuaranteeInsuranceContractsPremiumReceivableAcquiredFromBusinessAcquisition	0	USD
CY2018	ago	Financial Guarantee Insurance Contracts Premium Receivable Acquired From Business Acquisition FinancialGuaranteeInsuranceContractsPremiumReceivableAcquiredFromBusinessAcquisition	0	USD
CY2017	ago	Financial Guarantee Insurance Contracts Premium Receivable Acquired From Business Acquisition FinancialGuaranteeInsuranceContractsPremiumReceivableAcquiredFromBusinessAcquisition	270000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	689000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	610000000	USD
CY2017	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	301000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	318000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	577000000	USD
CY2017	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	301000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-21000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-8000000	USD
CY2017	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-8000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	10000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	9000000	USD
CY2017	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	12000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	21000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	-35000000	USD
CY2017	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	64000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustment	0	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustment	-10000000	USD
CY2017	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustment	0	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	1284000000	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
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	2000000	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
CY2019Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	1286000000	USD
CY2019	ago	Deferred Policy Acquisition Cost Amortization Expense Including Accretion Of Discount On Commissions DeferredPolicyAcquisitionCostAmortizationExpenseIncludingAccretionOfDiscountOnCommissions	17000000	USD
CY2018	ago	Deferred Policy Acquisition Cost Amortization Expense Including Accretion Of Discount On Commissions DeferredPolicyAcquisitionCostAmortizationExpenseIncludingAccretionOfDiscountOnCommissions	15000000	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	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	105000000	USD
CY2017Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	101000000	USD
CY2016Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	106000000	USD
CY2019	ago	Deferred Policy Acquisition Costs Additions Related To Business Acquisition DeferredPolicyAcquisitionCostsAdditionsRelatedToBusinessAcquisition	0	USD
CY2018	ago	Deferred Policy Acquisition Costs Additions Related To Business Acquisition DeferredPolicyAcquisitionCostsAdditionsRelatedToBusinessAcquisition	0	USD
CY2017	ago	Deferred Policy Acquisition Costs Additions Related To Business Acquisition DeferredPolicyAcquisitionCostsAdditionsRelatedToBusinessAcquisition	-2000000	USD
CY2019	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	23000000	USD
CY2018	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	19000000	USD
CY2017	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	16000000	USD
CY2017	ago	Deferred Policy Acquisition Cost Amortization Expense Including Accretion Of Discount On Commissions DeferredPolicyAcquisitionCostAmortizationExpenseIncludingAccretionOfDiscountOnCommissions	19000000	USD
CY2019Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	111000000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	105000000	USD
CY2017Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	101000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0194
CY2018	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0274
CY2019Q4	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	295000000	USD
CY2018Q4	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	674000000	USD
CY2019Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1050000000	USD
CY2018Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1177000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	38000000	USD
CY2018Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	34000000	USD
CY2019Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1012000000	USD
CY2018Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1143000000	USD
CY2019Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	747000000	USD
CY2018Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	490000000	USD
CY2019Q4	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	30000000	USD
CY2018Q4	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	24000000	USD
CY2019Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Other Recoverable LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseOtherRecoverable	0	USD
CY2018Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Other Recoverable LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseOtherRecoverable	3000000	USD
CY2019Q4	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-717000000	USD
CY2018Q4	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-469000000	USD
CY2019Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	295000000	USD
CY2018Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	674000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During First Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFirstQuarterFollowingBalanceSheetDate	9000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Second Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringSecondQuarterFollowingBalanceSheetDate	9000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Third Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringThirdQuarterFollowingBalanceSheetDate	9000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Fourth Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFourthQuarterFollowingBalanceSheetDate	9000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Fiscal Year Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFiscalYearFollowingBalanceSheetDate	36000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Second Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinSecondFullFiscalYear	35000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Third Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinThirdFullFiscalYear	34000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fourth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFourthFullFiscalYear	32000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fifth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFifthFullFiscalYear	33000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan Fiveand Within10 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethanFiveandWithin10YearsfromBalanceSheetDate	138000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan10andwithin15 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan10andwithin15YearsfromBalanceSheetDate	91000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan15andwithin20 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan15andwithin20YearsfromBalanceSheetDate	32000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Beyond Twentieth Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedBeyondTwentiethFiscalYear	8000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Present Value FinancialGuaranteeInsuranceContractsNetLosstobeExpensedPresentValue	439000000	USD
CY2019Q4	ago	Scheduleof Insured Financial Obligationswith Credit Deterioration Reductionsof Gross Claim Liability Netof Reinsurance Recoverable Discount ScheduleofInsuredFinancialObligationswithCreditDeteriorationReductionsofGrossClaimLiabilityNetofReinsuranceRecoverableDiscount	105000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Undiscounted FinancialGuaranteeInsuranceContractsNetLosstobeExpensedUndiscounted	544000000	USD
CY2019	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	93000000	USD
CY2018	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	64000000	USD
CY2017	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	388000000	USD
CY2019	us-gaap	Direct Premiums Written DirectPremiumsWritten	663000000	USD
CY2018	us-gaap	Direct Premiums Written DirectPremiumsWritten	288000000	USD
CY2017	us-gaap	Direct Premiums Written DirectPremiumsWritten	297000000	USD
CY2019	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	14000000	USD
CY2018	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	324000000	USD
CY2017	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	10000000	USD
CY2019	us-gaap	Ceded Premiums Written CededPremiumsWritten	-10000000	USD
CY2018	us-gaap	Ceded Premiums Written CededPremiumsWritten	-14000000	USD
CY2017	us-gaap	Ceded Premiums Written CededPremiumsWritten	-18000000	USD
CY2019	us-gaap	Premiums Written Net PremiumsWrittenNet	687000000	USD
CY2018	us-gaap	Premiums Written Net PremiumsWrittenNet	626000000	USD
CY2017	us-gaap	Premiums Written Net PremiumsWrittenNet	325000000	USD
CY2019	us-gaap	Direct Premiums Earned DirectPremiumsEarned	429000000	USD
CY2018	us-gaap	Direct Premiums Earned DirectPremiumsEarned	509000000	USD
CY2017	us-gaap	Direct Premiums Earned DirectPremiumsEarned	693000000	USD
CY2019	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	54000000	USD
CY2018	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	51000000	USD
CY2017	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	27000000	USD
CY2019	us-gaap	Ceded Premiums Earned CededPremiumsEarned	7000000	USD
CY2018	us-gaap	Ceded Premiums Earned CededPremiumsEarned	12000000	USD
CY2017	us-gaap	Ceded Premiums Earned CededPremiumsEarned	30000000	USD
CY2019	us-gaap	Premiums Earned Net PremiumsEarnedNet	476000000	USD
CY2018	us-gaap	Premiums Earned Net PremiumsEarnedNet	548000000	USD
CY2017	us-gaap	Premiums Earned Net PremiumsEarnedNet	690000000	USD
CY2019	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	101000000	USD
CY2018	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	68000000	USD
CY2017	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	404000000	USD
CY2019	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	2000000	USD
CY2018	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	-1000000	USD
CY2017	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	11000000	USD
CY2019	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	10000000	USD
CY2018	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	3000000	USD
CY2017	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	27000000	USD
CY2019	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	93000000	USD
CY2018	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	64000000	USD
CY2017	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	388000000	USD
CY2019Q4	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	20000000	USD
CY2018Q4	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	26000000	USD
CY2019Q4	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	11000000	USD
CY2018Q4	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	14000000	USD
CY2019Q4	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	1349000000	USD
CY2018Q4	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	2389000000	USD
CY2019Q4	ago	Specialty Insuranceand Reinsurance Ceded Par Outstanding SpecialtyInsuranceandReinsuranceCededParOutstanding	303000000	USD
CY2018Q4	ago	Specialty Insuranceand Reinsurance Ceded Par Outstanding SpecialtyInsuranceandReinsuranceCededParOutstanding	239000000	USD
CY2019	ago	Increase Decrease In Unearned Premiums Due To Commutations IncreaseDecreaseInUnearnedPremiumsDueToCommutations	15000000	USD
CY2018	ago	Increase Decrease In Unearned Premiums Due To Commutations IncreaseDecreaseInUnearnedPremiumsDueToCommutations	64000000	USD
CY2017	ago	Increase Decrease In Unearned Premiums Due To Commutations IncreaseDecreaseInUnearnedPremiumsDueToCommutations	82000000	USD
CY2019	ago	Increase Decrease In Net Par Due To Commutations IncreaseDecreaseInNetParDueToCommutations	-1069000000	USD
CY2018	ago	Increase Decrease In Net Par Due To Commutations IncreaseDecreaseInNetParDueToCommutations	-1457000000	USD
CY2017	ago	Increase Decrease In Net Par Due To Commutations IncreaseDecreaseInNetParDueToCommutations	-5107000000	USD
CY2019	ago	Gain Loss From Commutations GainLossFromCommutations	1000000	USD
CY2018	ago	Gain Loss From Commutations GainLossFromCommutations	-16000000	USD
CY2017	ago	Gain Loss From Commutations GainLossFromCommutations	328000000	USD
CY2018Q4	ago	Percentage Of Cds Contracts Fair Valued Using Minimum Premium PercentageOfCdsContractsFairValuedUsingMinimumPremium	0.17
CY2019	ago	Numberof Consolidated Investment Managed Collateralized Loan Obligations NumberofConsolidatedInvestmentManagedCollateralizedLoanObligations	1	Consolidated_Collateralized_Loan_obligations
CY2019	ago	Numberof Consolidated Investment Managed Funds NumberofConsolidatedInvestmentManagedFunds	3	Consolidated_Investment_Management_Funds
CY2019	ago	Minimum Percentageof Declinein Market Valueof Security Below Amortized Cost Consideredfor Assessing Impairmentof Investments MinimumPercentageofDeclineinMarketValueofSecurityBelowAmortizedCostConsideredforAssessingImpairmentofInvestments	0.20
CY2019	ago	Continuous Period Of Decline In Market Value Below Amortized Costs Considered For Assessing Impairment Of Investments ContinuousPeriodOfDeclineInMarketValueBelowAmortizedCostsConsideredForAssessingImpairmentOfInvestments	P6M
CY2019	ago	Continuous Periodof Declinein Market Valueof Security Consideredfor Assessing Impairmentof Investments ContinuousPeriodofDeclineinMarketValueofSecurityConsideredforAssessingImpairmentofInvestments	P12M
CY2019Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	79000000	USD
CY2018Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	91000000	USD
CY2019	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	387000000	USD
CY2018	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	404000000	USD
CY2017	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	426000000	USD
CY2019	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	9000000	USD
CY2018	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	9000000	USD
CY2017	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	9000000	USD
CY2019	us-gaap	Net Investment Income NetInvestmentIncome	378000000	USD
CY2018	us-gaap	Net Investment Income NetInvestmentIncome	395000000	USD
CY2017	us-gaap	Net Investment Income NetInvestmentIncome	417000000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	63000000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	20000000	USD
CY2017	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	95000000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	5000000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	12000000	USD
CY2017	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	12000000	USD
CY2019	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	1000000	USD
CY2018	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	1000000	USD
CY2017	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	0	USD
CY2019	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings	29000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings	35000000	USD
CY2017	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale Recognized In Earnings OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSaleRecognizedInEarnings	33000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	6000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	4000000	USD
CY2017	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Before Tax Including Portion Attributable To Noncontrolling Interest Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities	10000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	35000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	39000000	USD
CY2017	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	43000000	USD
CY2019	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	22000000	USD
CY2018	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-32000000	USD
CY2017	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	40000000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-15000000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	1000000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	18000000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1805000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1180000000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1701000000	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
CY2016Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	134000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2017	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	13000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	15000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	0	USD
CY2017	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	4000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	16000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	23000000	USD
CY2017	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	19000000	USD
CY2019Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	186000000	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
CY2019	ago	Numberof Outside Managers Managing Investment Portfolio NumberofOutsideManagersManagingInvestmentPortfolio	6	manager
CY2019Q4	us-gaap	Short Term Investments ShortTermInvestments	1268000000	USD
CY2018Q4	us-gaap	Short Term Investments ShortTermInvestments	729000000	USD
CY2019Q4	us-gaap	Investments Investments	10240000000	USD
CY2018Q4	us-gaap	Investments Investments	10873000000	USD
CY2019Q4	ago	Percentageof Availableforsale Securitiesat Amortized Cost PercentageofAvailableforsaleSecuritiesatAmortizedCost	1
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9639000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	517000000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	34000000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	10122000000	USD
CY2019Q4	ago	Accumulated Other Comprehensive Income Loss Otherthan Temporary Impairment Not Credit Loss Before Tax Debt Securities Total AccumulatedOtherComprehensiveIncomeLossOtherthanTemporaryImpairmentNotCreditLossBeforeTaxDebtSecuritiesTotal	59000000	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
CY2019Q4	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.42
CY2018Q4	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.48
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	145000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	442000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	33000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	587000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	34000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	57	Security
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	119	Security
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	176	Security
CY2019Q4	ago	Debt Securities Availableforsale Other Than Temporary Impairment Continuous Unrealized Loss Position Lessthan12 Months Number DebtSecuritiesAvailableforsaleOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionLessthan12MonthsNumber	1	Security
CY2019Q4	ago	Debt Securities Availableforsale Other Than Temporary Impairment Continuous Unrealized Loss Position Twelve Monthsor Longer Number DebtSecuritiesAvailableforsaleOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionTwelveMonthsorLongerNumber	7	Security
CY2019Q4	ago	Debt Securities Availableforsale Other Than Temporary Impairment Continuous Unrealized Loss Position Number DebtSecuritiesAvailableforsaleOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionNumber	8	Security
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1643000000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	34000000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	1952000000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	105000000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3595000000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	139000000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	417	Security
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	608	Security
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	997	Security
CY2018Q4	ago	Debt Securities Availableforsale Other Than Temporary Impairment Continuous Unrealized Loss Position Lessthan12 Months Number DebtSecuritiesAvailableforsaleOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionLessthan12MonthsNumber	22	Security
CY2018Q4	ago	Debt Securities Availableforsale Other Than Temporary Impairment Continuous Unrealized Loss Position Twelve Monthsor Longer Number DebtSecuritiesAvailableforsaleOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionTwelveMonthsorLongerNumber	22	Security
CY2018Q4	ago	Debt Securities Availableforsale Other Than Temporary Impairment Continuous Unrealized Loss Position Number DebtSecuritiesAvailableforsaleOtherThanTemporaryImpairmentContinuousUnrealizedLossPositionNumber	42	Security
CY2019Q4	ago	Available For Sale Securities Continuous Unrealized Loss Position Greater Than10 Percent Of Book Value Twelve Months Or Longer Number AvailableForSaleSecuritiesContinuousUnrealizedLossPositionGreaterThan10PercentOfBookValueTwelveMonthsOrLongerNumber	19	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
CY2019Q4	ago	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Greater Than10 Percent Book Value Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerGreaterThan10PercentBookValueAggregateLosses	25000000	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
CY2019Q4	us-gaap	Assets Held In Trust AssetsHeldInTrust	280000000	USD
CY2018Q4	us-gaap	Assets Held In Trust AssetsHeldInTrust	266000000	USD
CY2019	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P11Y6M
CY2018	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P11Y7M6D
CY2019Q4	ago	Financial Guaranty Contracts Accountedforas Credit Derivatives Outstanding Principal Amount FinancialGuarantyContractsAccountedforasCreditDerivativesOutstandingPrincipalAmount	5956000000	USD
CY2019Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-185000000	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
CY2019Q4	ago	Expected Losson Credit Derivativeto Be Paid Recovered Including Representationand Warranty Liability Benefit ExpectedLossonCreditDerivativetoBePaidRecoveredIncludingRepresentationandWarrantyLiabilityBenefit	-4000000	USD
CY2018Q4	ago	Expected Losson Credit Derivativeto Be Paid Recovered Including Representationand Warranty Liability Benefit ExpectedLossonCreditDerivativetoBePaidRecoveredIncludingRepresentationandWarrantyLiabilityBenefit	-2000000	USD
CY2019	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	8000000	USD
CY2018	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	9000000	USD
CY2017	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	17000000	USD
CY2019	ago	Credit Derivative Losses CreditDerivativeLosses	35000000	USD
CY2018	ago	Credit Derivative Losses CreditDerivativeLosses	25000000	USD
CY2017	ago	Credit Derivative Losses CreditDerivativeLosses	27000000	USD
CY2019	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-27000000	USD
CY2018	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-16000000	USD
CY2017	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-10000000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	21000000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	128000000	USD
CY2017	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	121000000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-6000000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	112000000	USD
CY2017	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	111000000	USD
CY2019Q4	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-261000000	USD
CY2018Q4	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-407000000	USD
CY2019Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	76000000	USD
CY2018Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	200000000	USD
CY2019Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-185000000	USD
CY2018Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-207000000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	22000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	117000000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	0	USD
CY2019	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P7Y
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	82000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	3000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	1000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	77000000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	2000000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	22000000	USD
CY2018Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	22000000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	216000000	USD
CY2018Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	24000000	USD
CY2019Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	115000000	USD
CY2019	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	3000000	USD
CY2017	us-gaap	Adjustment For Amortization AdjustmentForAmortization	1000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	13000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	12000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	11000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	11000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	10000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	20000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	77000000	USD
CY2019Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	0	USD
CY2019	ago	Variable Interest Entity Reporting Entity Involvement Trustee Report General Preparation Threshold VariableInterestEntityReportingEntityInvolvementTrusteeReportGeneralPreparationThreshold	P30D
CY2019Q4	ago	Variable Interest Entity Consolidated Carrying Amount Assets With Recourse VariableInterestEntityConsolidatedCarryingAmountAssetsWithRecourse	340000000	USD
CY2019Q4	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities With Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithRecourse	367000000	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
CY2019Q4	ago	Variable Interest Entity Consolidated Carrying Amount Assets Without Recourse VariableInterestEntityConsolidatedCarryingAmountAssetsWithoutRecourse	102000000	USD
CY2019Q4	ago	Variable Interest Entity Consolidated Carrying Amount Liabilities Without Recourse VariableInterestEntityConsolidatedCarryingAmountLiabilitiesWithoutRecourse	102000000	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
CY2019Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Assets VariableInterestEntityConsolidatedCarryingAmountAssets	442000000	USD
CY2019Q4	us-gaap	Variable Interest Entity Consolidated Carrying Amount Liabilities VariableInterestEntityConsolidatedCarryingAmountLiabilities	469000000	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
CY2019	ago	Variable Interest Entities Collateralized Loan Obligations Weighted Average Maturity VariableInterestEntitiesCollateralizedLoanObligationsWeightedAverageMaturity	P12Y9M18D
CY2019Q4	ago	Variable Interest Entities Collateralized Loan Obligations Weighted Average Interest Rate VariableInterestEntitiesCollateralizedLoanObligationsWeightedAverageInterestRate	0.038
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Fair Value RedeemableNoncontrollingInterestEquityOtherFairValue	0	USD
CY2019	ago	Redeemable Noncontrolling Interest Equity Other Contributionsto Investment Vehicles RedeemableNoncontrollingInterestEquityOtherContributionstoInvestmentVehicles	12000000	USD
CY2019	ago	Redeemable Noncontrolling Interest Equity Other Distributions From Investment Vehicles RedeemableNoncontrollingInterestEquityOtherDistributionsFromInvestmentVehicles	-4000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-1000000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Fair Value RedeemableNoncontrollingInterestEquityOtherFairValue	7000000	USD
CY2019Q4	ago	Variable Interest Entity Other Consolidated Carrying Amount Assets VariableInterestEntityOtherConsolidatedCarryingAmountAssets	91000000	USD
CY2019Q4	ago	Variable Interest Entity Other Consolidated Carrying Amount Liabilities VariableInterestEntityOtherConsolidatedCarryingAmountLiabilities	12000000	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
CY2019Q4	ago	Variable Interest Entity Numberof Policies Monitored VariableInterestEntityNumberofPoliciesMonitored	18000	policy
CY2019Q4	ago	Variable Interest Entity Numberof Policies Monitored Not Withinthe Scopeof Asc810 VariableInterestEntityNumberofPoliciesMonitoredNotWithintheScopeofASC810	16000	policy
CY2019Q4	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	90	policy
CY2018Q4	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	110	policy
CY2019Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1453000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1235000000	USD
CY2018Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1457000000	USD
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	1233000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	2000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	500000000	USD
CY2019Q4	ago	Long Term Debt Maturities Repayments Of Principal In Years Six Through Twenty Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsSixThroughTwentyFive	202000000	USD
CY2019Q4	ago	Long Term Debt Maturities Repayments Of Principal In Years Twenty Six Through Forty Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsTwentySixThroughFortyFive	0	USD
CY2019Q4	ago	Long Term Debt Maturities Repayments Of Principal In Years Forty Six Through Sixty Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsFortySixThroughSixtyFive	319000000	USD
CY2019Q4	ago	Long Term Debt Maturities Repayments Of Principal After Year Sixty Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSixtyFive	430000000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1453000000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	89000000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	94000000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	97000000	USD
CY2019	ago	Share Basedand Employee Stock Purchase Plan Expense Netof Capitalized Costs ShareBasedandEmployeeStockPurchasePlanExpenseNetofCapitalizedCosts	21000000	USD
CY2018	ago	Share Basedand Employee Stock Purchase Plan Expense Netof Capitalized Costs ShareBasedandEmployeeStockPurchasePlanExpenseNetofCapitalizedCosts	19000000	USD
CY2017	ago	Share Basedand Employee Stock Purchase Plan Expense Netof Capitalized Costs ShareBasedandEmployeeStockPurchasePlanExpenseNetofCapitalizedCosts	16000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1100000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	800000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	600000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2000000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	12000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	12000000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	11000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	17000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net Noncurrent DeferredTaxAssetsLiabilitiesNetNoncurrent	68000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	47000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	22000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	76000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	98000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	48000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	49000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	36000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	36000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	32000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	34000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	26000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	25000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	12000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	20000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	24000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	35000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	254000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	297000000	USD
CY2019Q4	ago	Deferred Tax Liabilities Unrealized Gains On Investments DeferredTaxLiabilitiesUnrealizedGainsOnInvestments	86000000	USD
CY2018Q4	ago	Deferred Tax Liabilities Unrealized Gains On Investments DeferredTaxLiabilitiesUnrealizedGainsOnInvestments	54000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	44000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	50000000	USD
CY2019Q4	ago	Deferred Tax Liabilities Market Discount DeferredTaxLiabilitiesMarketDiscount	11000000	USD
CY2018Q4	ago	Deferred Tax Liabilities Market Discount DeferredTaxLiabilitiesMarketDiscount	31000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	33000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	23000000	USD
CY2019Q4	ago	Deferred Tax Liabilities Unrealized Gains On Committed Capital Securities DeferredTaxLiabilitiesUnrealizedGainsOnCommittedCapitalSecurities	11000000	USD
CY2018Q4	ago	Deferred Tax Liabilities Unrealized Gains On Committed Capital Securities DeferredTaxLiabilitiesUnrealizedGainsOnCommittedCapitalSecurities	16000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Reserves And Accruals DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals	29000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Reserves And Accruals DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals	7000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	21000000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	12000000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	235000000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	193000000	USD
CY2019Q4	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	36000000	USD
CY2018Q4	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	36000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	17000000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	68000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	13000000	USD
CY2019Q4	ago	Tax Cutsand Jobs Actof2017 Deferred Tax Assets Tax Credit Carryforwards Foreign TaxCutsandJobsActof2017DeferredTaxAssetsTaxCreditCarryforwardsForeign	23000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	36000000	USD
CY2019	ago	Deferred Tax Assets Realization Assessment Period For Which Cumulative Operating Income Considered DeferredTaxAssetsRealizationAssessmentPeriodForWhichCumulativeOperatingIncomeConsidered	P3Y
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	91000000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	97000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	300000000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	19000000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	23000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	49000000	USD
CY2019	ago	Effective Income Tax Rate Reconciliation Business Combination Gain On Bargain Purchase Amount EffectiveIncomeTaxRateReconciliationBusinessCombinationGainOnBargainPurchaseAmount	0	USD
CY2018	ago	Effective Income Tax Rate Reconciliation Business Combination Gain On Bargain Purchase Amount EffectiveIncomeTaxRateReconciliationBusinessCombinationGainOnBargainPurchaseAmount	0	USD
CY2017	ago	Effective Income Tax Rate Reconciliation Business Combination Gain On Bargain Purchase Amount EffectiveIncomeTaxRateReconciliationBusinessCombinationGainOnBargainPurchaseAmount	20000000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	1000000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-15000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-26000000	USD
CY2019	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-6000000	USD
CY2018	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-1000000	USD
CY2017	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-8000000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1000000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9000000	USD
CY2019	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	-5000000	USD
CY2018	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	6000000	USD
CY2017	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	-4000000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-4000000	USD
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	61000000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	6000000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0	USD
CY2017	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	4000000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-7000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	261000000	USD
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.137
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.102
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.263
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	464000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	580000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	991000000	USD
CY2019	us-gaap	Revenues Revenues	963000000	USD
CY2018	us-gaap	Revenues Revenues	1001000000	USD
CY2017	us-gaap	Revenues Revenues	1739000000	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	-37000000	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Deferred Tax Asset Liabilities Net Income Tax Expense Benefit TaxCutsandJobsActof2017DeferredTaxAssetLiabilitiesNetIncomeTaxExpenseBenefit	34000000	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalIncomeTaxExpenseBenefit	-24000000	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Accounting Complete Transition Taxfor Accumulated Foreign Earnings Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017AccountingCompleteTransitionTaxforAccumulatedForeignEarningsProvisionalIncomeTaxExpenseBenefit	23000000	USD
CY2018	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Provisional Tax TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalTax	-1000000	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Provisional Tax TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalTax	93000000	USD
CY2018	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Tax Credit Realized TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized	0	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Tax Credit Realized TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized	31000000	USD
CY2018	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Write Offof Unremitted Earnings TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsWriteOffofUnremittedEarnings	0	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Write Offof Unremitted Earnings TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsWriteOffofUnremittedEarnings	-38000000	USD
CY2018	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalIncomeTaxExpenseBenefit	1000000	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsProvisionalIncomeTaxExpenseBenefit	-24000000	USD
CY2018	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	3000000	USD
CY2017	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	-37000000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	-4000000	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	61000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	50000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	8000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	1000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	31000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	4000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	15000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	17000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16000000	USD
CY2017Q2	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	37000000	USD
CY2019	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	3800000	USD
CY2018	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	4000000.0	USD
CY2017	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	4100000	USD
CY2019Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	2000000	USD
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
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	100000000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	130000000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y4M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0261
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2000000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2000000	USD
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y9M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0174
CY2019Q4	ago	Financeand Operating Lease Rightof Use Asset FinanceandOperatingLeaseRightofUseAsset	102000000	USD
CY2019Q4	ago	Financeand Operating Lease Liability FinanceandOperatingLeaseLiability	132000000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	100000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	10000000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	2000000	USD
CY2019	us-gaap	Lease Cost LeaseCost	12000000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	11000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	37000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	2000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	19000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	1000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	19000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	1000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	19000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	19000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	11000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	62000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	149000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	2000000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	19000000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	130000000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2000000	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
CY2019Q4	ago	Common Stock Shares Authorized Value CommonStockSharesAuthorizedValue	5000000	USD
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019	ago	Common Stock Voting Rights Numberof Votesper Share CommonStockVotingRightsNumberofVotesperShare	1	vote
CY2019	ago	Percentageof Controlled Sharesas Determined Pursuantto Section958 PercentageofControlledSharesasDeterminedPursuanttoSection958	0.095
CY2019	ago	Percentageof Voting Power Heldby One Shareholder PercentageofVotingPowerHeldbyOneShareholder	0.75
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.18
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-279000000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	32000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-247000000	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Change In Tax Rate Income Tax Expense Benefit TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit	56000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	212000000	USD
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-45000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	167000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	730000000	USD
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1000000	USD
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1000000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	401000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	520000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	729000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	99300000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110000000.0	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	120600000	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.04
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.73
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.05
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	401000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	520000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	729000000	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2017	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	401000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	520000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	729000000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	99300000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110000000.0	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	120600000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	900000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1300000	shares
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1700000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	100200000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111300000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	122300000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.00
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.68
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.96
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares
CY2019Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	118000000	USD
CY2019Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	112000000	USD
CY2019Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	123000000	USD
CY2019Q4	us-gaap	Premiums Earned Net PremiumsEarnedNet	123000000	USD
CY2019	us-gaap	Premiums Earned Net PremiumsEarnedNet	476000000	USD
CY2019Q1	us-gaap	Net Investment Income NetInvestmentIncome	98000000	USD
CY2019Q2	us-gaap	Net Investment Income NetInvestmentIncome	110000000	USD
CY2019Q3	us-gaap	Net Investment Income NetInvestmentIncome	88000000	USD
CY2019Q4	us-gaap	Net Investment Income NetInvestmentIncome	82000000	USD
CY2019	us-gaap	Net Investment Income NetInvestmentIncome	378000000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	0	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	0	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	0	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	22000000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	22000000	USD
CY2019Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-12000000	USD
CY2019Q2	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	8000000	USD
CY2019Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	16000000	USD
CY2019Q4	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	10000000	USD
CY2019	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	22000000	USD
CY2019Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-22000000	USD
CY2019Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-8000000	USD
CY2019Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	5000000	USD
CY2019Q4	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	19000000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-6000000	USD
CY2019Q1	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	5000000	USD
CY2019Q2	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	33000000	USD
CY2019Q3	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	4000000	USD
CY2019Q4	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	0	USD
CY2019	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	42000000	USD
CY2019Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	11000000	USD
CY2019Q2	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-14000000	USD
CY2019Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-21000000	USD
CY2019Q4	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	48000000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	24000000	USD
CY2019Q1	ago	Gain Loss From Commutations GainLossFromCommutations	0	USD
CY2019Q2	ago	Gain Loss From Commutations GainLossFromCommutations	1000000	USD
CY2019Q3	ago	Gain Loss From Commutations GainLossFromCommutations	0	USD
CY2019Q4	ago	Gain Loss From Commutations GainLossFromCommutations	0	USD
CY2019	ago	Gain Loss From Commutations GainLossFromCommutations	1000000	USD
CY2019Q1	us-gaap	Other Income OtherIncome	-3000000	USD
CY2019Q2	us-gaap	Other Income OtherIncome	24000000	USD
CY2019Q3	us-gaap	Other Income OtherIncome	-9000000	USD
CY2019Q4	us-gaap	Other Income OtherIncome	-8000000	USD
CY2019	us-gaap	Other Income OtherIncome	4000000	USD
CY2019Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	46000000	USD
CY2019Q2	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	-1000000	USD
CY2019Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	30000000	USD
CY2019Q4	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	18000000	USD
CY2019	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	93000000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	23000000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	22000000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	22000000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	22000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	89000000	USD
CY2019Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	6000000	USD
CY2019Q2	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	4000000	USD
CY2019Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	3000000	USD
CY2019Q4	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	5000000	USD
CY2019	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	18000000	USD
CY2019Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	41000000	USD
CY2019Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	39000000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	38000000	USD
CY2019Q4	us-gaap	Labor And Related Expense LaborAndRelatedExpense	60000000	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	178000000	USD
CY2019Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	23000000	USD
CY2019Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	21000000	USD
CY2019Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	27000000	USD
CY2019Q4	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	54000000	USD
CY2019	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	125000000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	56000000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	181000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	86000000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	137000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	460000000	USD
CY2019Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2000000	USD
CY2019Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2019Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2019Q4	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4000000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	58000000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	182000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	86000000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	138000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	464000000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4000000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	40000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	54000000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	142000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	69000000	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	136000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	401000000	USD
CY2019Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1000000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	54000000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	142000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	69000000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	137000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.52
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.40
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.43
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.04
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.52
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.39
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.42
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.00
CY2018Q1	us-gaap	Premiums Earned Net PremiumsEarnedNet	145000000	USD
CY2018Q2	us-gaap	Premiums Earned Net PremiumsEarnedNet	136000000	USD
CY2018Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	142000000	USD
CY2018Q4	us-gaap	Premiums Earned Net PremiumsEarnedNet	125000000	USD
CY2018	us-gaap	Premiums Earned Net PremiumsEarnedNet	548000000	USD
CY2018Q1	us-gaap	Net Investment Income NetInvestmentIncome	100000000	USD
CY2018Q2	us-gaap	Net Investment Income NetInvestmentIncome	98000000	USD
CY2018Q3	us-gaap	Net Investment Income NetInvestmentIncome	99000000	USD
CY2018Q4	us-gaap	Net Investment Income NetInvestmentIncome	98000000	USD
CY2018	us-gaap	Net Investment Income NetInvestmentIncome	395000000	USD
CY2018Q1	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-5000000	USD
CY2018Q2	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-2000000	USD
CY2018Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-7000000	USD
CY2018Q4	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-18000000	USD
CY2018	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-32000000	USD
CY2018Q1	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	34000000	USD
CY2018Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	48000000	USD
CY2018Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	21000000	USD
CY2018Q4	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	9000000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	112000000	USD
CY2018Q1	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	4000000	USD
CY2018Q2	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	2000000	USD
CY2018Q3	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	5000000	USD
CY2018Q4	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	3000000	USD
CY2018	ago	Variable Interest Entity Changein Fair Valueof Financial Guarantee Contracts VariableInterestEntityChangeinFairValueofFinancialGuaranteeContracts	14000000	USD
CY2018Q1	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	22000000	USD
CY2018Q2	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-36000000	USD
CY2018Q3	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-8000000	USD
CY2018Q4	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-15000000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-37000000	USD
CY2018Q1	ago	Gain Loss From Commutations GainLossFromCommutations	1000000	USD
CY2018Q2	ago	Gain Loss From Commutations GainLossFromCommutations	-18000000	USD
CY2018Q3	ago	Gain Loss From Commutations GainLossFromCommutations	1000000	USD
CY2018Q4	ago	Gain Loss From Commutations GainLossFromCommutations	0	USD
CY2018	ago	Gain Loss From Commutations GainLossFromCommutations	-16000000	USD
CY2018Q1	us-gaap	Other Income OtherIncome	-8000000	USD
CY2018Q2	us-gaap	Other Income OtherIncome	-8000000	USD
CY2018Q3	us-gaap	Other Income OtherIncome	22000000	USD
CY2018Q4	us-gaap	Other Income OtherIncome	11000000	USD
CY2018	us-gaap	Other Income OtherIncome	17000000	USD
CY2018Q1	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	-18000000	USD
CY2018Q2	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	44000000	USD
CY2018Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	17000000	USD
CY2018Q4	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	21000000	USD
CY2018	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	64000000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	24000000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	24000000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	23000000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	23000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	94000000	USD
CY2018Q1	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	5000000	USD
CY2018Q2	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	4000000	USD
CY2018Q3	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	3000000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	4000000	USD
CY2018	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	16000000	USD
CY2018Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40000000	USD
CY2018Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	36000000	USD
CY2018Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	36000000	USD
CY2018Q4	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40000000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	152000000	USD
CY2018Q1	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	25000000	USD
CY2018Q2	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	26000000	USD
CY2018Q3	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	20000000	USD
CY2018Q4	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	25000000	USD
CY2018	us-gaap	Other Cost And Expense Operating OtherCostAndExpenseOperating	96000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	217000000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	86000000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	176000000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	100000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	579000000	USD
CY2018Q1	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2018Q2	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2018Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1000000	USD
CY2018Q4	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	217000000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	87000000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	175000000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	101000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	580000000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20000000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	12000000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14000000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59000000	USD
CY2018Q1	us-gaap	Profit Loss ProfitLoss	197000000	USD
CY2018Q2	us-gaap	Profit Loss ProfitLoss	75000000	USD
CY2018Q3	us-gaap	Profit Loss ProfitLoss	161000000	USD
CY2018Q4	us-gaap	Profit Loss ProfitLoss	88000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2018Q1	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018Q2	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018Q4	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	197000000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	75000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	161000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	88000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
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CY2018Q4	us-gaap	Liabilities Liabilities	7048000000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Carrying Amount RedeemableNoncontrollingInterestEquityOtherCarryingAmount	0	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	6555000000	USD
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CY2019	us-gaap	Net Investment Income NetInvestmentIncome	378000000	USD
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CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
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CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
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CY2017	us-gaap	Deferred Policy Acquisition Cost Amortization Expense DeferredPolicyAcquisitionCostAmortizationExpense	19000000	USD
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CY2017	us-gaap	Profit Loss ProfitLoss	730000000	USD
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CY2017	us-gaap	Net Income Loss NetIncomeLoss	730000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	897000000	USD
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CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	873000000	USD
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CY2019	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	51000000	USD
CY2019	ago	Investing Activities Intercompany Debt InvestingActivitiesIntercompanyDebt	0	USD
CY2019	ago	Investing Activities Issuanceof Intercompany Loans InvestingActivitiesIssuanceofIntercompanyLoans	0	USD
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CY2018Q4	ago	Cashand Restricted Cash CashandRestrictedCash	104000000	USD
CY2019Q4	ago	Cashand Restricted Cash CashandRestrictedCash	183000000	USD
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CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	71000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	500000000	USD
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CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	101000000	USD
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CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-4000000	USD
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CY2017Q4	ago	Cashand Restricted Cash CashandRestrictedCash	144000000	USD
CY2018Q4	ago	Cashand Restricted Cash CashandRestrictedCash	104000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	433000000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2552000000	USD
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CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	191000000	USD
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CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	501000000	USD
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CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	30000000	USD
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Files In Submission

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2019 Q4 Form 10-K Financial Statement

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$AGO ASSURED GUARANTY LTD Stock $ago

2019 Q4 Form 10-K Financial Statement

#000127381320000006 Filed on February 28, 2020

Income Statement

Balance Sheet

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Facts In Submission

Files In Submission

$AGO
ASSURED GUARANTY LTD Stock $ago