$AGO
ASSURED GUARANTY LTD Stock $ago

$ago Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-Q Financial Statement

#000127381320000040 Filed on November 06, 2020

Income Statement

Concept	2020 Q4	2020 Q3	2019 Q3
Revenue	$292.0M	$268.0M	$206.0M
YoY Change	256.1%	30.1%	-25.09%
Cost Of Revenue		$73.00M	$30.00M
YoY Change		143.33%	76.47%
Gross Profit		$195.0M	$176.0M
YoY Change		10.8%	-31.78%
Gross Profit Margin		72.76%	85.44%
Selling, General & Admin	$61.00M	$57.00M
YoY Change	-65.73%
% of Gross Profit		29.23%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization		$4.000M	$3.000M
YoY Change		33.33%	0.0%
% of Gross Profit		2.05%	1.7%
Operating Expenses	$179.0M	$158.0M	$98.00M
YoY Change	55.65%	61.22%	28.95%
Operating Profit		$37.00M	$78.00M
YoY Change		-52.56%	-57.14%
Interest Expense	$63.00M	$21.00M	$22.00M
YoY Change	186.36%	-4.55%	-4.35%
% of Operating Profit		56.76%	28.21%
Other Income/Expense, Net
YoY Change
Pretax Income	$174.0M	$79.00M	$86.00M
YoY Change	26.09%	-8.14%	-50.86%
Income Tax	$25.00M	-$10.00M	$17.00M
% Of Pretax Income	14.37%	-12.66%	19.77%
Net Earnings	$148.0M	$86.00M	$69.00M
YoY Change	8.03%	24.64%	-57.14%
Net Earnings / Revenue	50.68%	32.09%	33.5%
Basic Earnings Per Share		$1.03	$0.71
Diluted Earnings Per Share	$1.832M	$1.02	$0.70
COMMON SHARES
Basic Shares Outstanding	80.81M shares	83.20M shares	98.20M shares
Diluted Shares Outstanding		83.80M shares	98.90M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2019 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$298.0M	$406.0M	$229.0M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment			$65.00M
YoY Change
Goodwill	$117.0M
YoY Change	0.0%
Intangibles
YoY Change
Long-Term Investments	$11.75B	$11.07B	$10.48B
YoY Change	8.68%	5.63%	-4.98%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$15.33B	$14.70B	$13.37B
YoY Change	7.04%	9.93%	-2.71%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses			$90.00M
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			$90.00M
YoY Change
LONG-TERM LIABILITIES
Long-Term Debt	$1.224B	$1.223B	$1.234B
YoY Change	-0.89%	-0.89%	-1.2%
Other Long-Term Liabilities	$2.582B	$2.111B	$1.050B
YoY Change	69.53%	101.05%	-14.08%
Total Long-Term Liabilities	$3.806B	$3.334B	$2.284B
YoY Change	38.0%	45.97%	-7.57%
TOTAL LIABILITIES
Total Short-Term Liabilities			$90.00M
Total Long-Term Liabilities	$3.806B	$3.334B	$2.284B
Total Liabilities	$8.629B	$8.078B	$6.715B
YoY Change	12.44%	20.3%	-6.16%
SHAREHOLDERS EQUITY
Retained Earnings	$6.143B	$6.143B	$6.331B
YoY Change	-2.41%	-2.97%	0.44%
Common Stock	$1.000M	$1.000M	$1.000M
YoY Change	0.0%	0.0%	-99.5%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.643B	$6.549B	$6.652B
YoY Change
Total Liabilities & Shareholders Equity	$15.33B	$14.70B	$13.37B
YoY Change	7.04%	9.93%	-2.71%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2019 Q3
OPERATING ACTIVITIES
Net Income	$148.0M	$86.00M	$69.00M
YoY Change	8.03%	24.64%	-57.14%
Depreciation, Depletion And Amortization		$4.000M	$3.000M
YoY Change		33.33%	0.0%
Cash From Operating Activities	-$189.0M	-$219.0M	-$167.0M
YoY Change	31.25%	31.14%	81.52%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions
YoY Change
Other Investing Activities	-$118.0M	$173.0M	$439.0M
YoY Change	-219.19%	-60.59%	111.06%
Cash From Investing Activities	-$118.0M	$173.0M	$439.0M
YoY Change	-219.19%	-60.59%	111.06%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	195.0M	-21.00M	-235.0M
YoY Change	-3350.0%	-91.06%	5.86%
NET CHANGE
Cash From Operating Activities	-189.0M	-219.0M	-167.0M
Cash From Investing Activities	-118.0M	173.0M	439.0M
Cash From Financing Activities	195.0M	-21.00M	-235.0M
Net Change In Cash	-112.0M	-67.00M	37.00M
YoY Change	119.61%	-281.08%	-134.91%
FREE CASH FLOW
Cash From Operating Activities	-$189.0M	-$219.0M	-$167.0M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

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	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2020-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-32141
	dei	Entity Registrant Name EntityRegistrantName	ASSURED GUARANTY LTD
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	D0
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	98-0429991
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	dei	Entity Address Country EntityAddressCountry	BM
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CY2020Q3	us-gaap	Profit Loss ProfitLoss	89000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	69000000	USD
	us-gaap	Profit Loss ProfitLoss	219000000	USD
	us-gaap	Profit Loss ProfitLoss	265000000	USD
CY2020Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3000000	USD
CY2019Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	5000000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	86000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	69000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	265000000	USD
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.03
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.45
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.63
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.43
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.61
CY2020Q3	us-gaap	Profit Loss ProfitLoss	89000000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	69000000	USD
	us-gaap	Profit Loss ProfitLoss	219000000	USD
	us-gaap	Profit Loss ProfitLoss	265000000	USD
CY2020Q3	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax	7000000	USD
CY2019Q3	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax	7000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax	11000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax	51000000	USD
CY2020Q3	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax	67000000	USD
CY2019Q3	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax	33000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax	80000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentNetofTax	275000000	USD
CY2020Q3	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax	-2000000	USD
CY2019Q3	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax	2000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax	5000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax	14000000	USD
CY2020Q3	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax	8000000	USD
CY2019Q3	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax	-9000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax	-19000000	USD
	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Netof Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentNetofTax	-52000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	75000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	24000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	61000000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	223000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	-4000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	0	USD
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	1000000	USD
	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	4000000	USD
CY2020Q3	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	0	USD
CY2019Q3	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	0	USD
	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	0	USD
	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	-1000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	71000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	24000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	62000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	226000000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	160000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	93000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	281000000	USD
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	491000000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	5000000	USD
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	157000000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	93000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	276000000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	491000000	USD
CY2020Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6489000000	USD
CY2020Q3	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	88000000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	340000000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.20
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	17000000	USD
CY2020Q3	ago	Non Redeemable Noncontrolling Interest Equity Other Reallocationof Ownership Interests NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests	0	USD
CY2020Q3	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	3000000	USD
CY2020Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	40000000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	5000000	USD
CY2020Q3	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	3000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	71000000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6596000000	USD
CY2019Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6722000000	USD
CY2019Q3	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	69000000	USD
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2019Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	18000000	USD
CY2019Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	150000000	USD
CY2019Q3	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	5000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	24000000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6652000000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6645000000	USD
	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	220000000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.60
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	53000000	USD
	ago	Non Redeemable Noncontrolling Interest Equity Other Reallocationof Ownership Interests NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests	-10000000	USD
	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	44000000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	320000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	7000000	USD
	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	19000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	62000000	USD
CY2020Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6596000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6555000000	USD
	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	265000000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.54
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	56000000	USD
	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	2000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	226000000	USD
CY2019Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6652000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-664000000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-365000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	856000000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	688000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	627000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1306000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	642000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	664000000	USD
	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	238000000	USD
	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	216000000	USD
	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	41000000	USD
	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	198000000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	206000000	USD
	ago	Paymentsfor Proceedsfrom Shortterm Investmentswith Maturitiesof Less Than Three Months PaymentsforProceedsfromShorttermInvestmentswithMaturitiesofLessThanThreeMonths	-415000000	USD
	ago	Paymentsfor Proceedsfrom Shortterm Investmentswith Maturitiesof Less Than Three Months PaymentsforProceedsfromShorttermInvestmentswithMaturitiesofLessThanThreeMonths	404000000	USD
	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	67000000	USD
	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	119000000	USD
	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	0	USD
	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	51000000	USD
	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	21000000	USD
	us-gaap	Proceeds From Sale Of Other Assets Investing Activities ProceedsFromSaleOfOtherAssetsInvestingActivities	35000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	11000000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	5000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	906000000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1070000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	53000000	USD
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	56000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	320000000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	340000000	USD
	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	63000000	USD
	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	162000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	22000000	USD
	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-12000000	USD
	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-16000000	USD
	us-gaap	Proceeds From Issuance Of Financial Services Obligations ProceedsFromIssuanceOfFinancialServicesObligations	361000000	USD
	us-gaap	Proceeds From Issuance Of Financial Services Obligations ProceedsFromIssuanceOfFinancialServicesObligations	0	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	47000000	USD
	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	69000000	USD
	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	0	USD
	ago	Distributions To Noncontrolling Interests From Investment Vehicles DistributionsToNoncontrollingInterestsFromInvestmentVehicles	19000000	USD
	ago	Distributions To Noncontrolling Interests From Investment Vehicles DistributionsToNoncontrollingInterestsFromInvestmentVehicles	0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-12000000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-578000000	USD
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-7000000	USD
	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-2000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	223000000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	125000000	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
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	406000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	229000000	USD
	us-gaap	Income Taxes Paid IncomeTaxesPaid	1000000	USD
	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	2000000	USD
	us-gaap	Interest Paid Net InterestPaidNet	49000000	USD
	us-gaap	Interest Paid Net InterestPaidNet	51000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	1000000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	188000000	USD
	ago	Non Cash Or Part Non Cash Acquisition Investments Sold NonCashOrPartNonCashAcquisitionInvestmentsSold	1000000	USD
	ago	Non Cash Or Part Non Cash Acquisition Investments Sold NonCashOrPartNonCashAcquisitionInvestmentsSold	44000000	USD
CY2020Q3	us-gaap	Cash Cash	223000000	USD
CY2019Q3	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	93000000	USD
CY2019Q3	us-gaap	Cash Cash	229000000	USD
CY2020Q3	us-gaap	Restricted Cash RestrictedCash	1000000	USD
CY2019Q3	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2020Q3	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	182000000	USD
CY2019Q3	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	0	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	406000000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	229000000	USD
CY2020Q3	ago	Holding Companieswith Outstanding Public Debt Number HoldingCompanieswithOutstandingPublicDebtNumber	2	Company
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2020Q3	ago	Revenue Including Adjustments RevenueIncludingAdjustments	232000000	USD
CY2020Q3	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	232000000	USD
CY2020Q3	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	200000000	USD
CY2020Q3	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	32000000	USD
CY2020Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	7000000	USD
CY2020Q3	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	39000000	USD
CY2020Q3	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	-12000000	USD
CY2020Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	3000000	USD
CY2020Q3	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	48000000	USD
CY2020Q3	us-gaap	Net Investment Income NetInvestmentIncome	71000000	USD
CY2020Q3	us-gaap	Interest Expense InterestExpense	21000000	USD
CY2020Q3	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	14000000	USD
CY2019Q3	ago	Revenue Including Adjustments RevenueIncludingAdjustments	223000000	USD
CY2019Q3	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	223000000	USD
CY2019Q3	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	130000000	USD
CY2019Q3	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	0	USD
CY2019Q3	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	93000000	USD
CY2019Q3	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	16000000	USD
CY2019Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2019Q3	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	77000000	USD
CY2019Q3	us-gaap	Net Investment Income NetInvestmentIncome	88000000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	22000000	USD
CY2019Q3	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	10000000	USD
	ago	Revenue Including Adjustments RevenueIncludingAdjustments	716000000	USD
	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	716000000	USD
	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	496000000	USD
	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	220000000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3000000	USD
	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	223000000	USD
	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	18000000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	5000000	USD
	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	200000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	229000000	USD
	us-gaap	Interest Expense InterestExpense	64000000	USD
	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	44000000	USD
	ago	Revenue Including Adjustments RevenueIncludingAdjustments	720000000	USD
	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	720000000	USD
	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	353000000	USD
	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	367000000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3000000	USD
	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	370000000	USD
	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	66000000	USD
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	304000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	296000000	USD
	us-gaap	Interest Expense InterestExpense	67000000	USD
	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	33000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	86000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	69000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	265000000	USD
CY2020Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	13000000	USD
CY2019Q3	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	16000000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	12000000	USD
	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	12000000	USD
CY2020Q3	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	-3000000	USD
CY2019Q3	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	11000000	USD
	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	6000000	USD
	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	-29000000	USD
CY2020Q3	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	-10000000	USD
CY2019Q3	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	-14000000	USD
	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	13000000	USD
	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	-4000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	40000000	USD
CY2019Q3	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	-20000000	USD
	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	-15000000	USD
	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	-23000000	USD
CY2020Q3	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	40000000	USD
CY2019Q3	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	-7000000	USD
	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	16000000	USD
	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	-44000000	USD
CY2020Q3	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	2000000	USD
CY2019Q3	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	1000000	USD
	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	2000000	USD
	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	-5000000	USD
CY2020Q3	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	48000000	USD
CY2019Q3	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	77000000	USD
	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	200000000	USD
	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	304000000	USD
CY2020Q3	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	232000000	USD
CY2019Q3	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	223000000	USD
	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	716000000	USD
	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	720000000	USD
CY2020Q3	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	232000000	USD
CY2019Q3	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	223000000	USD
	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	716000000	USD
	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	720000000	USD
CY2020Q3	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	200000000	USD
CY2019Q3	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	130000000	USD
	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	496000000	USD
	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	353000000	USD
CY2020Q3	ago	Insured Financial Obligations Outstanding Principal Amount Secondto Pay Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountSecondtoPayAmountNet	5800000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Secondto Pay Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountSecondtoPayAmountNet	6600000000	USD
CY2019Q4	ago	Insured Financial Obligations Loss Mitigation Securities InsuredFinancialObligationsLossMitigationSecurities	1400000000	USD
CY2020Q3	ago	Insured Financial Obligations Loss Mitigation Securities InsuredFinancialObligationsLossMitigationSecurities	1400000000	USD
CY2020Q3	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	365435000000	USD
CY2019Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	375776000000	USD
CY2020Q3	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	364507000000	USD
CY2019Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	374130000000	USD
CY2020Q3	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	233075000000	USD
CY2020Q3	ago	Insured Financial Obligations Outstanding Principle Amount Percentage InsuredFinancialObligationsOutstandingPrincipleAmountPercentage	1.000
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principle Amount Percentage InsuredFinancialObligationsOutstandingPrincipleAmountPercentage	1.000
CY2020Q3	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	233075000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2020Q2	ago	Insured Financial Obligations Net Par Exposures Reassumed InsuredFinancialObligationsNetParExposuresReassumed	118000000	USD
CY2020Q3	ago	Specialty Insuranceand Reinsurance Gross Par SpecialtyInsuranceandReinsuranceGrossPar	1405000000	USD
CY2019Q4	ago	Specialty Insuranceand Reinsurance Gross Par SpecialtyInsuranceandReinsuranceGrossPar	1444000000	USD
CY2020Q3	ago	Specialty Insuranceand Reinsurance Net Par SpecialtyInsuranceandReinsuranceNetPar	1108000000	USD
CY2019Q4	ago	Specialty Insuranceand Reinsurance Net Par SpecialtyInsuranceandReinsuranceNetPar	1141000000	USD
	ago	Insured Financial Obligations Insured Credit Performanceof Guaranteed Obligations Term InsuredFinancialObligationsInsuredCreditPerformanceofGuaranteedObligationsTerm	P30Y
	ago	Insured Financial Obligations Claim Liability Weighted Average Risk Free Discount Rate InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0054
CY2019	ago	Insured Financial Obligations Claim Liability Weighted Average Risk Free Discount Rate InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0194
CY2020Q2	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	735000000	USD
CY2019Q2	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	960000000	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
CY2020Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	1000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	5000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	7000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	19000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	-2000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	1000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	30000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	-4000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	71000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	19000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	64000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	-29000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	70000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	25000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	101000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-14000000	USD
CY2020Q3	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	334000000	USD
CY2019Q3	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	267000000	USD
	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	367000000	USD
	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	451000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	471000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	718000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	471000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	718000000	USD
CY2020Q2	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	735000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	70000000	USD
CY2020Q3	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	334000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	471000000	USD
CY2019Q2	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	960000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	25000000	USD
CY2019Q3	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	267000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	718000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	101000000	USD
	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	367000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	471000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-14000000	USD
	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	451000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	718000000	USD
	ago	Reinsurance Recoverables Periodafter Endof Reporting Periodfor Settlementof Ceded Paid Losses ReinsuranceRecoverablesPeriodafterEndofReportingPeriodforSettlementofCededPaidLosses	P45D
CY2020Q3	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	11000000	USD
CY2019Q3	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	7000000	USD
	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	20000000	USD
	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	23000000	USD
CY2020Q3	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	22000000	USD
CY2019Q4	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	33000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	471000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2020Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	70000000	USD
CY2019Q3	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	25000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	101000000	USD
	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-14000000	USD
	ago	Additional Loss Recovery Assumption Recovery Period AdditionalLossRecoveryAssumptionRecoveryPeriod	P5Y
CY2020Q3	ago	Loss Recovery Assumption Additional Increasein Recovery Projection Percent LossRecoveryAssumptionAdditionalIncreaseinRecoveryProjectionPercent	0.30
CY2020Q3	ago	Loss Recovery Assumption Additional Increasein Recovery Projection Economic Benefit LossRecoveryAssumptionAdditionalIncreaseinRecoveryProjectionEconomicBenefit	50000000	USD
CY2020Q3	ago	Loss Recovery Assumption Additional Decreasein Recovery Projection Percent LossRecoveryAssumptionAdditionalDecreaseinRecoveryProjectionPercent	0.10
CY2020Q3	ago	Loss Recovery Assumption Additional Decreasein Recovery Projection Economic Loss LossRecoveryAssumptionAdditionalDecreaseinRecoveryProjectionEconomicLoss	50000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	85000000	USD
CY2019Q3	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	81000000	USD
	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	250000000	USD
	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	253000000	USD
CY2020Q3	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	17000000	USD
CY2019Q3	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	37000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	64000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	83000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-5000000	USD
CY2019Q3	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-4000000	USD
	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-15000000	USD
	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-13000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	107000000	USD
CY2019Q3	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	122000000	USD
	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	329000000	USD
	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	349000000	USD
CY2020Q3	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	0	USD
CY2019Q3	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	1000000	USD
	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	2000000	USD
	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	4000000	USD
CY2020Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	107000000	USD
CY2019Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	123000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	331000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	353000000	USD
CY2019Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	1286000000	USD
CY2018Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	904000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Specialty Insurance FinancialGuaranteeInsuranceContractsPremiumReceivableSpecialtyInsurance	2000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Specialty Insurance FinancialGuaranteeInsuranceContractsPremiumReceivableSpecialtyInsurance	1000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other Non Financial Guarantee FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOtherNonFinancialGuarantee	1284000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other Non Financial Guarantee FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOtherNonFinancialGuarantee	903000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	342000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	164000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	297000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	198000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-9000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-10000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	14000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	8000000	USD
	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	-14000000	USD
	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	-24000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other Non Financial Guarantee FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOtherNonFinancialGuarantee	1320000000	USD
CY2019Q3	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other Non Financial Guarantee FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOtherNonFinancialGuarantee	843000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Premium Receivable Specialty Insurance FinancialGuaranteeInsuranceContractsPremiumReceivableSpecialtyInsurance	1000000	USD
CY2019Q3	ago	Financial Guarantee Insurance Contracts Premium Receivable Specialty Insurance FinancialGuaranteeInsuranceContractsPremiumReceivableSpecialtyInsurance	1000000	USD
CY2020Q3	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	1321000000	USD
CY2019Q3	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	844000000	USD
	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0054
CY2019	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0194
CY2020Q3	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	47000000	USD
CY2019Q4	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	295000000	USD
CY2020Q3	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	982000000	USD
CY2019Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1050000000	USD
CY2020Q3	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	8000000	USD
CY2019Q4	us-gaap	Reinsurance Recoverable For Unpaid Claims And Claims Adjustments ReinsuranceRecoverableForUnpaidClaimsAndClaimsAdjustments	38000000	USD
CY2020Q3	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	974000000	USD
CY2019Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1012000000	USD
CY2020Q3	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	961000000	USD
CY2019Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	747000000	USD
CY2020Q3	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	34000000	USD
CY2019Q4	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	30000000	USD
CY2020Q3	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-927000000	USD
CY2019Q4	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-717000000	USD
CY2020Q3	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	47000000	USD
CY2019Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	295000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Fourth Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFourthQuarterFollowingBalanceSheetDate	9000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Second Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinSecondFullFiscalYear	38000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Third Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinThirdFullFiscalYear	37000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fourth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFourthFullFiscalYear	33000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fifth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFifthFullFiscalYear	32000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan Fiveand Within10 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethanFiveandWithin10YearsfromBalanceSheetDate	135000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan10andwithin15 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan10andwithin15YearsfromBalanceSheetDate	87000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan15andwithin20 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan15andwithin20YearsfromBalanceSheetDate	31000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Beyond Twentieth Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedBeyondTwentiethFiscalYear	9000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Present Value FinancialGuaranteeInsuranceContractsNetLosstobeExpensedPresentValue	411000000	USD
CY2020Q3	ago	Scheduleof Insured Financial Obligationswith Credit Deterioration Reductionsof Gross Claim Liability Netof Reinsurance Recoverable Discount ScheduleofInsuredFinancialObligationswithCreditDeteriorationReductionsofGrossClaimLiabilityNetofReinsuranceRecoverableDiscount	61000000	USD
CY2020Q3	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Undiscounted FinancialGuaranteeInsuranceContractsNetLosstobeExpensedUndiscounted	472000000	USD
CY2020Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	73000000	USD
CY2019Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	30000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	130000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	75000000	USD
CY2020Q3	us-gaap	Direct Premiums Written DirectPremiumsWritten	122000000	USD
CY2019Q3	us-gaap	Direct Premiums Written DirectPremiumsWritten	67000000	USD
	us-gaap	Direct Premiums Written DirectPremiumsWritten	334000000	USD
	us-gaap	Direct Premiums Written DirectPremiumsWritten	156000000	USD
CY2020Q3	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	-1000000	USD
CY2019Q3	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	2000000	USD
	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	0	USD
	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	3000000	USD
CY2020Q3	us-gaap	Ceded Premiums Written CededPremiumsWritten	-1000000	USD
CY2019Q3	us-gaap	Ceded Premiums Written CededPremiumsWritten	1000000	USD
	us-gaap	Ceded Premiums Written CededPremiumsWritten	-3000000	USD
	us-gaap	Ceded Premiums Written CededPremiumsWritten	-12000000	USD
CY2020Q3	us-gaap	Premiums Written Net PremiumsWrittenNet	122000000	USD
CY2019Q3	us-gaap	Premiums Written Net PremiumsWrittenNet	68000000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	337000000	USD
	us-gaap	Premiums Written Net PremiumsWrittenNet	171000000	USD
CY2020Q3	us-gaap	Direct Premiums Earned DirectPremiumsEarned	100000000	USD
CY2019Q3	us-gaap	Direct Premiums Earned DirectPremiumsEarned	113000000	USD
	us-gaap	Direct Premiums Earned DirectPremiumsEarned	307000000	USD
	us-gaap	Direct Premiums Earned DirectPremiumsEarned	317000000	USD
CY2020Q3	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	8000000	USD
CY2019Q3	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	12000000	USD
	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	28000000	USD
	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	42000000	USD
CY2020Q3	us-gaap	Ceded Premiums Earned CededPremiumsEarned	1000000	USD
CY2019Q3	us-gaap	Ceded Premiums Earned CededPremiumsEarned	2000000	USD
	us-gaap	Ceded Premiums Earned CededPremiumsEarned	4000000	USD
	us-gaap	Ceded Premiums Earned CededPremiumsEarned	6000000	USD
CY2020Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	107000000	USD
CY2019Q3	us-gaap	Premiums Earned Net PremiumsEarnedNet	123000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	331000000	USD
	us-gaap	Premiums Earned Net PremiumsEarnedNet	353000000	USD
CY2020Q3	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	72000000	USD
CY2019Q3	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	28000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	118000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	82000000	USD
CY2020Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	4000000	USD
CY2019Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	2000000	USD
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	15000000	USD
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	4000000	USD
CY2020Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	3000000	USD
CY2019Q3	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	0	USD
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	3000000	USD
	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	11000000	USD
CY2020Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	73000000	USD
CY2019Q3	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	30000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	130000000	USD
	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	75000000	USD
CY2020Q3	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	17000000	USD
CY2019Q4	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	20000000	USD
CY2020Q3	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	-23000000	USD
CY2019Q4	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	11000000	USD
CY2020Q3	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	886000000	USD
CY2019Q4	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	1349000000	USD
CY2020Q3	ago	Specialty Insuranceand Reinsurance Ceded Par Outstanding SpecialtyInsuranceandReinsuranceCededParOutstanding	297000000	USD
CY2019Q4	ago	Specialty Insuranceand Reinsurance Ceded Par Outstanding SpecialtyInsuranceandReinsuranceCededParOutstanding	303000000	USD
CY2020Q2	ago	Insured Financial Obligations Net Par Exposures Reassumed InsuredFinancialObligationsNetParExposuresReassumed	118000000	USD
	ago	Numberof Outside Managers Managing Investment Portfolio NumberofOutsideManagersManagingInvestmentPortfolio	3	manager
CY2020Q3	us-gaap	Short Term Investments ShortTermInvestments	858000000	USD
CY2019Q4	us-gaap	Short Term Investments ShortTermInvestments	1268000000	USD
CY2020Q3	us-gaap	Investments Investments	9527000000	USD
CY2019Q4	us-gaap	Investments Investments	10240000000	USD
CY2019Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	79000000	USD
CY2020Q3	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	79000000	USD
CY2020Q3	ago	Percentageof Availableforsale Securitiesat Amortized Cost PercentageofAvailableforsaleSecuritiesatAmortizedCost	1
CY2020Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	8938000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	76000000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	614000000	USD
CY2020Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	62000000	USD
CY2020Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9414000000	USD
CY2020Q3	ago	Accumulated Other Comprehensive Income Loss Otherthan Temporary Impairment Not Credit Loss Before Tax Debt Securities Total AccumulatedOtherComprehensiveIncomeLossOtherthanTemporaryImpairmentNotCreditLossBeforeTaxDebtSecuritiesTotal	-42000000	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
CY2020Q3	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.37
CY2019Q4	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.42
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	300000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	4000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	194000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	16000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	494000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	20000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	93	Security
CY2020Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	55	Security
CY2020Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	147	Security
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
CY2020Q3	ago	Available For Sale Securities Continuous Unrealized Loss Position Greater Than10 Percent Of Book Value Twelve Months Or Longer Number AvailableForSaleSecuritiesContinuousUnrealizedLossPositionGreaterThan10PercentOfBookValueTwelveMonthsOrLongerNumber	22	Security
CY2020Q3	ago	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Greater Than10 Percent Book Value Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerGreaterThan10PercentBookValueAggregateLosses	13000000	USD
CY2019Q4	ago	Available For Sale Securities Continuous Unrealized Loss Position Greater Than10 Percent Of Book Value Twelve Months Or Longer Number AvailableForSaleSecuritiesContinuousUnrealizedLossPositionGreaterThan10PercentOfBookValueTwelveMonthsOrLongerNumber	19	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
CY2020Q3	us-gaap	Assets Held In Trust AssetsHeldInTrust	290000000	USD
CY2019Q4	us-gaap	Assets Held In Trust AssetsHeldInTrust	280000000	USD
CY2020Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	73000000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	90000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	235000000	USD
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	302000000	USD
CY2020Q3	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	2000000	USD
CY2019Q3	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	2000000	USD
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	6000000	USD
	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	6000000	USD
CY2020Q3	us-gaap	Net Investment Income NetInvestmentIncome	71000000	USD
CY2019Q3	us-gaap	Net Investment Income NetInvestmentIncome	88000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	229000000	USD
	us-gaap	Net Investment Income NetInvestmentIncome	296000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	16000000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	29000000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	39000000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	48000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	3000000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	1000000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	12000000	USD
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	4000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	0	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	12000000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	15000000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	32000000	USD
CY2020Q3	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	13000000	USD
CY2019Q3	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	16000000	USD
	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	12000000	USD
	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	12000000	USD
CY2020Q3	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	5000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	6000000	USD
CY2019Q3	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	12000000	USD
	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	17000000	USD
CY2020Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	137000000	USD
CY2019Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	405000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	627000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1306000000	USD
CY2020Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	75000000	USD
CY2019Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	191000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	185000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	0	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	0	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	1000000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	0	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	0	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	0	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	0	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	7000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	1000000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	0	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	13000000	USD
	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	13000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	76000000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	191000000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	76000000	USD
CY2019Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	191000000	USD
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CY2019	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P11Y6M
CY2020Q3	ago	Financial Guaranty Contracts Accountedforas Credit Derivatives Outstanding Principal Amount FinancialGuarantyContractsAccountedforasCreditDerivativesOutstandingPrincipalAmount	5658000000	USD
CY2020Q3	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-159000000	USD
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
CY2020Q3	ago	Expected Losson Credit Derivativeto Be Paid Recovered Including Representationand Warranty Liability Benefit ExpectedLossonCreditDerivativetoBePaidRecoveredIncludingRepresentationandWarrantyLiabilityBenefit	-13000000	USD
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CY2020Q3	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	1000000	USD
CY2019Q3	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	2000000	USD
	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	4000000	USD
	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	6000000	USD
CY2020Q3	ago	Credit Derivative Losses CreditDerivativeLosses	6000000	USD
CY2019Q3	ago	Credit Derivative Losses CreditDerivativeLosses	5000000	USD
	ago	Credit Derivative Losses CreditDerivativeLosses	9000000	USD
	ago	Credit Derivative Losses CreditDerivativeLosses	30000000	USD
CY2020Q3	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-5000000	USD
CY2019Q3	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-3000000	USD
	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-5000000	USD
	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-24000000	USD
CY2020Q3	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	2000000	USD
CY2019Q3	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	8000000	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	25000000	USD
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-1000000	USD
CY2020Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-3000000	USD
CY2019Q3	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	5000000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	20000000	USD
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-25000000	USD
CY2020Q3	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-356000000	USD
CY2019Q4	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-261000000	USD
CY2020Q3	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	197000000	USD
CY2019Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	76000000	USD
CY2020Q3	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-159000000	USD
CY2019Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-185000000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	17000000	USD
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	60000000	USD
CY2020Q3	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	0	USD
CY2020Q2	us-gaap	Redeemable Noncontrolling Interest Equity Other Fair Value RedeemableNoncontrollingInterestEquityOtherFairValue	20000000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Other Fair Value RedeemableNoncontrollingInterestEquityOtherFairValue	7000000	USD
CY2020Q3	ago	Redeemable Noncontrolling Interest Equity Other Reallocationof Ownership Interests RedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests	0	USD
	ago	Redeemable Noncontrolling Interest Equity Other Reallocationof Ownership Interests RedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests	-10000000	USD
CY2020Q3	ago	Redeemable Noncontrolling Interest Equity Other Contributionsto Investment Vehicles RedeemableNoncontrollingInterestEquityOtherContributionstoInvestmentVehicles	0	USD
	ago	Redeemable Noncontrolling Interest Equity Other Contributionsto Investment Vehicles RedeemableNoncontrollingInterestEquityOtherContributionstoInvestmentVehicles	25000000	USD
CY2020Q3	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	1000000	USD
	us-gaap	Net Income Loss Attributable To Redeemable Noncontrolling Interest NetIncomeLossAttributableToRedeemableNoncontrollingInterest	-1000000	USD
CY2020Q3	us-gaap	Redeemable Noncontrolling Interest Equity Other Fair Value RedeemableNoncontrollingInterestEquityOtherFairValue	21000000	USD
CY2020Q3	us-gaap	Redeemable Noncontrolling Interest Equity Other Fair Value RedeemableNoncontrollingInterestEquityOtherFairValue	21000000	USD
CY2020Q3	ago	Variable Interest Entity Other Consolidated Carrying Amount Assets VariableInterestEntityOtherConsolidatedCarryingAmountAssets	95000000	USD
CY2020Q3	ago	Variable Interest Entity Other Consolidated Carrying Amount Liabilities VariableInterestEntityOtherConsolidatedCarryingAmountLiabilities	12000000	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
CY2020Q3	ago	Variable Interest Entity Numberof Policies Monitored VariableInterestEntityNumberofPoliciesMonitored	18000	policy
CY2020Q3	ago	Variable Interest Entity Numberof Policies Monitored Not Withinthe Scopeof Asc810 VariableInterestEntityNumberofPoliciesMonitoredNotWithintheScopeofASC810	16000	policy
CY2020Q3	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	84	policy
CY2019Q4	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	90	policy
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	12000000	USD
CY2020Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	37000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	17000000	USD
CY2020Q3	ago	Deferred Tax Assets Liabilities Net Current1 DeferredTaxAssetsLiabilitiesNetCurrent1	25000000	USD
CY2019Q4	ago	Deferred Tax Assets Liabilities Net Current1 DeferredTaxAssetsLiabilitiesNetCurrent1	47000000	USD
	ago	Tax Cutsand Jobs Actof2017 Incomplete Accounting Transition Taxfor Accumulated Foreign Earnings Tax Credit Realized TaxCutsandJobsActof2017IncompleteAccountingTransitionTaxforAccumulatedForeignEarningsTaxCreditRealized	23000000	USD
CY2020Q3	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	36000000	USD
	ago	Deferred Tax Assets Realization Assessment Period For Which Cumulative Operating Income Considered DeferredTaxAssetsRealizationAssessmentPeriodForWhichCumulativeOperatingIncomeConsidered	P3Y
CY2020Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19000000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	17000000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	50000000	USD
	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	64000000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	5000000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	5000000	USD
	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	13000000	USD
	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	15000000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-17000000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	1000000	USD
	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-17000000	USD
	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	1000000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-7000000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-6000000	USD
	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-7000000	USD
	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-6000000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1000000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	0	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2000000	USD
	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1000000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-4000000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	6000000	USD
	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	3000000	USD
	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	11000000	USD
CY2020Q3	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	4000000	USD
CY2019Q3	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	5000000	USD
	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	3000000	USD
	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	9000000	USD
CY2020Q3	ago	Effective Income Tax Rate Reconciliation Nondeductible Expense Deferred Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDeferredCompensationAmount	0	USD
CY2019Q3	ago	Effective Income Tax Rate Reconciliation Nondeductible Expense Deferred Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDeferredCompensationAmount	-1000000	USD
	ago	Effective Income Tax Rate Reconciliation Nondeductible Expense Deferred Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDeferredCompensationAmount	0	USD
	ago	Effective Income Tax Rate Reconciliation Nondeductible Expense Deferred Compensation Amount EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDeferredCompensationAmount	-3000000	USD
CY2020Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
CY2019Q3	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	0	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1000000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-10000000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	20000000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	61000000	USD
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.120
CY2019Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.192
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.084
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.186
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	79000000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	86000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	239000000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	326000000	USD
CY2020Q3	us-gaap	Revenues Revenues	268000000	USD
CY2019Q3	us-gaap	Revenues Revenues	206000000	USD
	us-gaap	Revenues Revenues	736000000	USD
	us-gaap	Revenues Revenues	667000000	USD
CY2020Q3	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	17000000	USD
	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	300000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1000000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2020Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	17000000	USD
	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	17000000	USD
CY2020Q3	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	17000000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	69000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	214000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	85000000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	71000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	34000000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	24000000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	74000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	62000000	USD
	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	237000000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	226000000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	86000000	USD
	us-gaap	Net Income Loss NetIncomeLoss	265000000	USD
CY2020Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	USD
CY2019Q3	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	USD
	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	0	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	86000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	69000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	214000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	265000000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83200000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	98200000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	87400000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	100800000	shares
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.03
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.71
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.45
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.63
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	86000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	69000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	214000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	265000000	USD
CY2020Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2019Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	86000000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	69000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	214000000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	265000000	USD
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	83200000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	98200000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	87400000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	100800000	shares
CY2020Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	600000	shares
CY2019Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	700000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	600000	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	800000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	83800000	shares
CY2019Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	98900000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	88000000.0	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	101600000	shares
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.02
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.70
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.43
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.61
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	500000	shares
CY2019Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000000.0	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares

Files In Submission

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2020 Q4 Form 10-Q Financial Statement

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$AGO ASSURED GUARANTY LTD Stock $ago

2020 Q4 Form 10-Q Financial Statement

#000127381320000040 Filed on November 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AGO
ASSURED GUARANTY LTD Stock $ago