$AGO
ASSURED GUARANTY LTD Stock $ago

$ago Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000127381321000004 Filed on February 26, 2021

Income Statement

Concept	2019 Q4	2018	2017 Q4
Revenue	$82.00M	$1.001B	$96.00M
YoY Change	-16.33%	-42.44%	-17.95%
Cost Of Revenue	$18.00M	$64.00M	$34.00M
YoY Change	-14.29%	-83.51%	-69.64%
Gross Profit	$64.00M	$937.0M	$62.00M
YoY Change	-16.88%	-30.64%	1140.0%
Gross Profit Margin	78.05%	93.61%	64.58%
Selling, General & Admin	$178.0M
YoY Change
% of Gross Profit	278.13%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$5.000M	$16.00M	$6.000M
YoY Change	25.0%	-15.79%	20.0%
% of Gross Profit	7.81%	1.71%	9.68%
Operating Expenses	$115.0M	$328.0M	$101.0M
YoY Change	27.78%	-49.62%	-41.95%
Operating Profit	-$51.00M	$609.0M	-$39.00M
YoY Change	292.31%	-13.0%	-76.92%
Interest Expense	$22.00M	$94.00M	$24.00M
YoY Change	-4.35%	-3.09%	-4.0%
% of Operating Profit		15.44%
Other Income/Expense, Net
YoY Change
Pretax Income	$138.0M	$580.0M	$156.0M
YoY Change	36.63%	-41.47%	-42.44%
Income Tax	$2.000M	$59.00M	$104.0M
% Of Pretax Income	1.45%	10.17%	66.67%
Net Earnings	$137.0M	$521.0M	$52.00M
YoY Change	55.68%	-28.63%	-73.6%
Net Earnings / Revenue	167.07%	52.05%	54.17%
Basic Earnings Per Share	$1.43	$4.73	$0.44
Diluted Earnings Per Share	$1.42	$4.68	$0.44
COMMON SHARES
Basic Shares Outstanding	95.39M shares	110.0M shares	117.5M shares
Diluted Shares Outstanding		111.3M shares

Balance Sheet

Concept	2019 Q4	2018	2017 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$183.0M		$144.0M
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	$100.0M
YoY Change
Goodwill	$117.0M
YoY Change
Intangibles
YoY Change
Long-Term Investments	$10.81B	$10.87B	$11.40B
YoY Change	-0.56%	-4.58%	3.73%
Other Assets			$98.00M
YoY Change			-80.28%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$14.33B	$13.60B	$14.43B
YoY Change	5.32%	-5.75%	1.99%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$130.0M
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due		$95.00M
YoY Change
Total Short-Term Liabilities	$130.0M	$95.00M
YoY Change
LONG-TERM LIABILITIES
Long-Term Debt	$1.235B	$1.138B	$1.292B
YoY Change	0.16%	-11.92%	-1.07%
Other Long-Term Liabilities	$1.523B	$1.126B	$1.322B
YoY Change	35.26%	-14.83%	-19.34%
Total Long-Term Liabilities	$2.758B	$2.264B	$2.614B
YoY Change	16.91%	-13.39%	-11.24%
TOTAL LIABILITIES
Total Short-Term Liabilities	$130.0M	$95.00M
Total Long-Term Liabilities	$2.758B	$2.264B	$2.614B
Total Liabilities	$7.674B	$7.048B	$7.594B
YoY Change	8.88%	-7.19%	-0.69%
SHAREHOLDERS EQUITY
Retained Earnings	$6.295B		$5.892B
YoY Change	-1.24%		11.4%
Common Stock	$1.000M		$574.0M
YoY Change	-98.85%		-45.9%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$6.639B	$6.555B	$6.839B
YoY Change
Total Liabilities & Shareholders Equity	$14.33B	$13.60B	$14.43B
YoY Change	5.32%	-5.75%	1.99%

Cashflow Statement

Concept	2019 Q4	2018	2017 Q4
OPERATING ACTIVITIES
Net Income	$137.0M	$521.0M	$52.00M
YoY Change	55.68%	-28.63%	-73.6%
Depreciation, Depletion And Amortization	$5.000M	$16.00M	$6.000M
YoY Change	25.0%	-15.79%	20.0%
Cash From Operating Activities	-$144.0M	$462.0M	$79.00M
YoY Change	-230.91%	6.7%	36.21%
INVESTING ACTIVITIES
Capital Expenditures
YoY Change
Acquisitions		$0.00
YoY Change		-100.0%
Other Investing Activities	$99.00M	$1.000M	$113.0M
YoY Change	-3.88%	-80.0%	-20.98%
Cash From Investing Activities	$99.00M	$297.0M	$113.0M
YoY Change	-3.88%	-13.91%	-20.98%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$500.0M
YoY Change		-0.2%
Debt Paid & Issued, Net		$101.0M
YoY Change		236.67%
Cash From Financing Activities	-6.000M	-$795.0M	-121.0M
YoY Change	-96.83%	3.79%	-29.24%
NET CHANGE
Cash From Operating Activities	-144.0M	$462.0M	79.00M
Cash From Investing Activities	99.00M	$297.0M	113.0M
Cash From Financing Activities	-6.000M	-$795.0M	-121.0M
Net Change In Cash	-51.00M	-$40.00M	71.00M
YoY Change	-312.5%	-335.29%	136.67%
FREE CASH FLOW
Cash From Operating Activities	-$144.0M	$462.0M	$79.00M
Capital Expenditures
Free Cash Flow
YoY Change

Facts In Submission

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CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	58000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	65000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	74000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59000000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	368000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	401000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	362000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.22
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.04
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.73
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.19
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.00
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.68
CY2020	us-gaap	Profit Loss ProfitLoss	368000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	401000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2020	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax	20000000	USD
CY2019	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax	46000000	USD
CY2018	ago	Other Comprehensive Income Loss Availableforsale Securities Without Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithoutCreditImpairmentTax	-32000000	USD
CY2020	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities With No Other Than Temporary Impairment Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax	163000000	USD
CY2019	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities With No Other Than Temporary Impairment Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax	293000000	USD
CY2018	ago	Other Comprehensive Income Unrealized Holding Gain Loss On Securities With No Other Than Temporary Impairment Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesWithNoOtherThanTemporaryImpairmentArisingDuringPeriodNetOfTax	-215000000	USD
CY2020	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax	-4000000	USD
CY2019	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax	-14000000	USD
CY2018	ago	Other Comprehensive Income Loss Availableforsale Securities With Credit Impairment Tax OtherComprehensiveIncomeLossAvailableforsaleSecuritiesWithCreditImpairmentTax	-8000000	USD
CY2020	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	16000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	46000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Losses Investments Portion In Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities	26000000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	147000000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	247000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-241000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	7000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	4000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Financial Liability Fair Value Option After Tax And Reclassification Adjustment OtherComprehensiveIncomeLossFinancialLiabilityFairValueOptionAfterTaxAndReclassificationAdjustment	2000000	USD
CY2020	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	0	USD
CY2019	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	0	USD
CY2018	ago	Other Comprehensive Income Loss Other Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherTaxPortionAttributableToParent	-2000000	USD
CY2020	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	2000000	USD
CY2019	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	-2000000	USD
CY2018	ago	Other Comprehensive Income Loss Other Netof Tax Portion Attributable To Parent OtherComprehensiveIncomeLossOtherNetofTaxPortionAttributableToParent	-8000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	156000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	249000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-247000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	524000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	650000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	274000000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	6000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-1000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	518000000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	651000000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	274000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6839000000	USD
CY2018	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	521000000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.64
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	71000000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	500000000	USD
CY2018	ago	Stock Issued During Period Value Sharebased Compensationand Other StockIssuedDuringPeriodValueSharebasedCompensationandOther	13000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-247000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6555000000	USD
CY2019	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	402000000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.72
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	74000000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	500000000	USD
CY2019	ago	Stock Issued During Period Value Sharebased Compensationand Other StockIssuedDuringPeriodValueSharebasedCompensationandOther	7000000	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	6000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	249000000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6645000000	USD
CY2020	us-gaap	Net Income Loss Including Portion Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossIncludingPortionAttributableToNonredeemableNoncontrollingInterest	369000000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.80
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	69000000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	446000000	USD
CY2020	ago	Stock Issued During Period Value Sharebased Compensationand Other StockIssuedDuringPeriodValueSharebasedCompensationandOther	16000000	USD
CY2020	ago	Non Redeemable Noncontrolling Interest Equity Other Reallocationof Ownership Interests NonRedeemableNoncontrollingInterestEquityOtherReallocationofOwnershipInterests	-10000000	USD
CY2020	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	63000000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	45000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	156000000	USD
CY2020	us-gaap	Stockholders Equity Other StockholdersEquityOther	15000000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	6684000000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	368000000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	401000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	521000000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-54000000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-34000000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-36000000	USD
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	9000000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	35000000	USD
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	31000000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	58000000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	65000000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	74000000	USD
CY2020	ago	Realized Noncash Investments Gains Losses RealizedNoncashInvestmentsGainsLosses	18000000	USD
CY2019	ago	Realized Noncash Investments Gains Losses RealizedNoncashInvestmentsGainsLosses	22000000	USD
CY2018	ago	Realized Noncash Investments Gains Losses RealizedNoncashInvestmentsGainsLosses	-32000000	USD
CY2020	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	102000000	USD
CY2019	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	388000000	USD
CY2018	us-gaap	Increase Decrease In Premiums Receivable IncreaseDecreaseInPremiumsReceivable	6000000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-20000000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-20000000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Reinsurance Premiums IncreaseDecreaseInPrepaidReinsurancePremiums	-58000000	USD
CY2020	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	-1000000	USD
CY2019	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	224000000	USD
CY2018	us-gaap	Increase Decrease In Unearned Premiums IncreaseDecreaseInUnearnedPremiums	39000000	USD
CY2020	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-174000000	USD
CY2019	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-528000000	USD
CY2018	us-gaap	Increase Decrease In Liability For Claims And Claims Adjustment Expense Reserve IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve	-173000000	USD
CY2020	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	85000000	USD
CY2019	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	22000000	USD
CY2018	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	62000000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	10000000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	6000000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	26000000	USD
CY2020	ago	Purchasesof Securitiesof Consolidated Investment Vehicles PurchasesofSecuritiesofConsolidatedInvestmentVehicles	2053000000	USD
CY2019	ago	Purchasesof Securitiesof Consolidated Investment Vehicles PurchasesofSecuritiesofConsolidatedInvestmentVehicles	267000000	USD
CY2018	ago	Purchasesof Securitiesof Consolidated Investment Vehicles PurchasesofSecuritiesofConsolidatedInvestmentVehicles	0	USD
CY2020	ago	Proceeds From Sales Of Securities Of Consolidated Investment Vehicles ProceedsFromSalesOfSecuritiesOfConsolidatedInvestmentVehicles	1156000000	USD
CY2019	ago	Proceeds From Sales Of Securities Of Consolidated Investment Vehicles ProceedsFromSalesOfSecuritiesOfConsolidatedInvestmentVehicles	13000000	USD
CY2018	ago	Proceeds From Sales Of Securities Of Consolidated Investment Vehicles ProceedsFromSalesOfSecuritiesOfConsolidatedInvestmentVehicles	0	USD
CY2020	ago	Maturities And Paydowns Of Securities Of Consolidated Investment Vehicles MaturitiesAndPaydownsOfSecuritiesOfConsolidatedInvestmentVehicles	71000000	USD
CY2019	ago	Maturities And Paydowns Of Securities Of Consolidated Investment Vehicles MaturitiesAndPaydownsOfSecuritiesOfConsolidatedInvestmentVehicles	5000000	USD
CY2018	ago	Maturities And Paydowns Of Securities Of Consolidated Investment Vehicles MaturitiesAndPaydownsOfSecuritiesOfConsolidatedInvestmentVehicles	0	USD
CY2020	ago	Proceeds From Payments For Money Market Funds ProceedsFromPaymentsForMoneyMarketFunds	108000000	USD
CY2019	ago	Proceeds From Payments For Money Market Funds ProceedsFromPaymentsForMoneyMarketFunds	0	USD
CY2018	ago	Proceeds From Payments For Money Market Funds ProceedsFromPaymentsForMoneyMarketFunds	0	USD
CY2020	ago	Payments To Cover Securities Sold Short PaymentsToCoverSecuritiesSoldShort	460000000	USD
CY2019	ago	Payments To Cover Securities Sold Short PaymentsToCoverSecuritiesSoldShort	0	USD
CY2018	ago	Payments To Cover Securities Sold Short PaymentsToCoverSecuritiesSoldShort	0	USD
CY2020	ago	Proceeds From Securities Sold Short ProceedsFromSecuritiesSoldShort	509000000	USD
CY2019	ago	Proceeds From Securities Sold Short ProceedsFromSecuritiesSoldShort	0	USD
CY2018	ago	Proceeds From Securities Sold Short ProceedsFromSecuritiesSoldShort	0	USD
CY2020	ago	Increase Decreasein Other Operating Activitiesof Consolidated Investment Vehicles IncreaseDecreaseinOtherOperatingActivitiesofConsolidatedInvestmentVehicles	-69000000	USD
CY2019	ago	Increase Decreasein Other Operating Activitiesof Consolidated Investment Vehicles IncreaseDecreaseinOtherOperatingActivitiesofConsolidatedInvestmentVehicles	-3000000	USD
CY2018	ago	Increase Decreasein Other Operating Activitiesof Consolidated Investment Vehicles IncreaseDecreaseinOtherOperatingActivitiesofConsolidatedInvestmentVehicles	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-853000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	-509000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	462000000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1380000000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	873000000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	1881000000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	779000000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1805000000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	1180000000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	878000000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	781000000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	962000000	USD
CY2020	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	85000000	USD
CY2019	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	229000000	USD
CY2018	us-gaap	Payments To Acquire Short Term Investments PaymentsToAcquireShortTermInvestments	243000000	USD
CY2020	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	5000000	USD
CY2019	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	2000000	USD
CY2018	us-gaap	Proceeds From Sale Of Short Term Investments ProceedsFromSaleOfShortTermInvestments	23000000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	73000000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	316000000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Shortterm Investments ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments	207000000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	430000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-623000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	-84000000	USD
CY2020	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	83000000	USD
CY2019	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	139000000	USD
CY2018	ago	Proceedsfrom Paydownson Financial Guaranty Variable Interest Entities Assets ProceedsfromPaydownsonFinancialGuarantyVariableInterestEntitiesAssets	116000000	USD
CY2020	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	0	USD
CY2019	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	51000000	USD
CY2018	ago	Proceedsfrom Saleof Financial Guaranty Variable Interest Entities Assets ProceedsfromSaleofFinancialGuarantyVariableInterestEntitiesAssets	0	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	145000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2020	ago	Proceeds From Saleof Other Invested Assets ProceedsFromSaleofOtherInvestedAssets	23000000	USD
CY2019	ago	Proceeds From Saleof Other Invested Assets ProceedsFromSaleofOtherInvestedAssets	36000000	USD
CY2018	ago	Proceeds From Saleof Other Invested Assets ProceedsFromSaleofOtherInvestedAssets	38000000	USD
CY2020	ago	Paymentsfor Purchaseof Other Invested Assets PaymentsforPurchaseofOtherInvestedAssets	19000000	USD
CY2019	ago	Paymentsfor Purchaseof Other Invested Assets PaymentsforPurchaseofOtherInvestedAssets	88000000	USD
CY2018	ago	Paymentsfor Purchaseof Other Invested Assets PaymentsforPurchaseofOtherInvestedAssets	20000000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-1000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	3000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	788000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	1169000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	297000000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	69000000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	74000000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	71000000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	446000000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	500000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	500000000	USD
CY2020	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	77000000	USD
CY2019	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	181000000	USD
CY2018	ago	Paydown Of Financial Guaranty Variable Interest Entities Liabilities PaydownOfFinancialGuarantyVariableInterestEntitiesLiabilities	116000000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	22000000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	4000000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	101000000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10000000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-15000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-7000000	USD
CY2020	us-gaap	Proceeds From Issuance Of Financial Services Obligations ProceedsFromIssuanceOfFinancialServicesObligations	738000000	USD
CY2019	us-gaap	Proceeds From Issuance Of Financial Services Obligations ProceedsFromIssuanceOfFinancialServicesObligations	482000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Financial Services Obligations ProceedsFromIssuanceOfFinancialServicesObligations	0	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	234000000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2020	ago	Repaymentof Warehouse Loansand Equity RepaymentofWarehouseLoansandEquity	210000000	USD
CY2019	ago	Repaymentof Warehouse Loansand Equity RepaymentofWarehouseLoansandEquity	306000000	USD
CY2018	ago	Repaymentof Warehouse Loansand Equity RepaymentofWarehouseLoansandEquity	0	USD
CY2020	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	88000000	USD
CY2019	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	18000000	USD
CY2018	ago	Contributions From Noncontrolling Interests To Investment Vehicles ContributionsFromNoncontrollingInterestsToInvestmentVehicles	0	USD
CY2020	ago	Distributions To Redeemable Noncontrolling Interests From Investment Vehicles DistributionsToRedeemableNoncontrollingInterestsFromInvestmentVehicles	43000000	USD
CY2019	ago	Distributions To Redeemable Noncontrolling Interests From Investment Vehicles DistributionsToRedeemableNoncontrollingInterestsFromInvestmentVehicles	4000000	USD
CY2018	ago	Distributions To Redeemable Noncontrolling Interests From Investment Vehicles DistributionsToRedeemableNoncontrollingInterestsFromInvestmentVehicles	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	183000000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-584000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-795000000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-3000000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	3000000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-4000000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	115000000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	79000000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-40000000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	183000000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	104000000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	144000000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	298000000	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
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-25000000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-4000000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	81000000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	84000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	99000000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	1000000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	188000000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Investments Acquired1 NoncashOrPartNoncashAcquisitionInvestmentsAcquired1	4000000	USD
CY2020	ago	Noncashor Part Noncash Acquisition Investments Sold NoncashorPartNoncashAcquisitionInvestmentsSold	1000000	USD
CY2019	ago	Noncashor Part Noncash Acquisition Investments Sold NoncashorPartNoncashAcquisitionInvestmentsSold	44000000	USD
CY2018	ago	Noncashor Part Noncash Acquisition Investments Sold NoncashorPartNoncashAcquisitionInvestmentsSold	0	USD
CY2020Q4	us-gaap	Cash Cash	162000000	USD
CY2019Q4	us-gaap	Cash Cash	169000000	USD
CY2018Q4	us-gaap	Cash Cash	104000000	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	2000000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2018Q4	us-gaap	Restricted Cash RestrictedCash	0	USD
CY2020Q4	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	134000000	USD
CY2019Q4	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	14000000	USD
CY2018Q4	ago	Cashof Consolidated Investment Vehicles CashofConsolidatedInvestmentVehicles	0	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	298000000	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
CY2020Q4	ago	Number Of Holding Companies Having Outstanding Public Debt NumberOfHoldingCompaniesHavingOutstandingPublicDebt	2	Company
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	1	segment
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	segment
CY2020	ago	Revenue Including Adjustments RevenueIncludingAdjustments	989000000	USD
CY2020	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	989000000	USD
CY2020	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	727000000	USD
CY2020	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	262000000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	27000000	USD
CY2020	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	289000000	USD
CY2020	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	27000000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	6000000	USD
CY2020	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	256000000	USD
CY2020	us-gaap	Net Investment Income NetInvestmentIncome	297000000	USD
CY2020	us-gaap	Interest Expense InterestExpense	85000000	USD
CY2020	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	76000000	USD
CY2019	ago	Revenue Including Adjustments RevenueIncludingAdjustments	964000000	USD
CY2019	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	964000000	USD
CY2019	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	516000000	USD
CY2019	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	448000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4000000	USD
CY2019	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	452000000	USD
CY2019	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	62000000	USD
CY2019	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-1000000	USD
CY2019	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	391000000	USD
CY2019	us-gaap	Net Investment Income NetInvestmentIncome	378000000	USD
CY2019	us-gaap	Interest Expense InterestExpense	89000000	USD
CY2019	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	48000000	USD
CY2018	ago	Revenue Including Adjustments RevenueIncludingAdjustments	959000000	USD
CY2018	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	959000000	USD
CY2018	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	431000000	USD
CY2018	ago	Income Lossfrom Continuing Operationsbefore Equity Method Investments Income Taxes Noncontrolling Interest Segment Total IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsIncomeTaxesNoncontrollingInterestSegmentTotal	528000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2018	ago	Adjusted Income Lossfrom Continuing Operationsbefore Income Taxes Noncontrolling Interest Segment Total AdjustedIncomeLossfromContinuingOperationsbeforeIncomeTaxesNoncontrollingInterestSegmentTotal	529000000	USD
CY2018	ago	Segment Income Tax Expense Benefit SegmentIncomeTaxExpenseBenefit	47000000	USD
CY2018	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	0	USD
CY2018	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	482000000	USD
CY2018	us-gaap	Net Investment Income NetInvestmentIncome	395000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	94000000	USD
CY2018	ago	Noncash Compensationand Operating Expenses Segment NoncashCompensationandOperatingExpensesSegment	41000000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	362000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2020	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	18000000	USD
CY2019	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	22000000	USD
CY2018	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	-32000000	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	65000000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	-10000000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives And Commodity Contracts UnrealizedGainLossOnDerivativesAndCommodityContracts	101000000	USD
CY2020	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	-1000000	USD
CY2019	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	-22000000	USD
CY2018	ago	Fair Value Gain Loss On Committed Capital Securities FairValueGainLossOnCommittedCapitalSecurities	14000000	USD
CY2020	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	42000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	22000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation Segment Total FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslationSegmentTotal	-32000000	USD
CY2020	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	124000000	USD
CY2019	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	12000000	USD
CY2018	ago	Adjustmentsto Operating Income Pre Tax AdjustmentstoOperatingIncomePreTax	51000000	USD
CY2020	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	18000000	USD
CY2019	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	1000000	USD
CY2018	ago	Adjustmentsto Operating Income Tax AdjustmentstoOperatingIncomeTax	12000000	USD
CY2020	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	256000000	USD
CY2019	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	391000000	USD
CY2018	ago	Adjusted Income Loss Attributableto Parent AdjustedIncomeLossAttributabletoParent	482000000	USD
CY2020	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	989000000	USD
CY2019	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	964000000	USD
CY2018	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	959000000	USD
CY2020	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	989000000	USD
CY2019	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	964000000	USD
CY2018	ago	Segment Revenue Including Adjustments SegmentRevenueIncludingAdjustments	959000000	USD
CY2020	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	727000000	USD
CY2019	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	516000000	USD
CY2018	ago	Segment Benefits Losses And Expenses SegmentBenefitsLossesAndExpenses	431000000	USD
CY2020Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	366692000000	USD
CY2019Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Gross InsuredFinancialObligationsInsuredContractualPaymentsOutstandingGross	375776000000	USD
CY2020Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	366233000000	USD
CY2019Q4	ago	Insured Financial Obligations Insured Contractual Payments Outstanding Net InsuredFinancialObligationsInsuredContractualPaymentsOutstandingNet	374130000000	USD
CY2020Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	234153000000	USD
CY2020Q4	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
CY2020Q4	ago	Insured Financial Obligations Outstanding Principal Amount Gross InsuredFinancialObligationsOutstandingPrincipalAmountGross	234571000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Gross InsuredFinancialObligationsOutstandingPrincipalAmountGross	238156000000	USD
CY2020Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	234153000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2020Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Zeroto Five Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountZerotoFiveYears	57498000000	USD
CY2020Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Fiveto Ten Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFivetoTenYears	49045000000	USD
CY2020Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Tento Fifteen Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTentoFifteenYears	44311000000	USD
CY2020Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Fifteento Twenty Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountFifteentoTwentyYears	34135000000	USD
CY2020Q4	ago	Insured Financial Obligations Maturitiesof Outstanding Principle Amount Twentyand Above Years InsuredFinancialObligationsMaturitiesofOutstandingPrincipleAmountTwentyandAboveYears	49164000000	USD
CY2020Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	234153000000	USD
CY2020Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	234153000000	USD
CY2019Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	236807000000	USD
CY2020Q4	ago	Insured Financial Obligations Numberof Contracts InsuredFinancialObligationsNumberofContracts	8220
CY2020Q4	ago	Insured Financial Obligations Outstanding Principal Amount Net InsuredFinancialObligationsOutstandingPrincipalAmountNet	234153000000	USD
CY2020Q4	ago	Insured Financial Obligations Outstanding Principal Amountas Percentageof Total Outstanding Principal InsuredFinancialObligationsOutstandingPrincipalAmountasPercentageofTotalOutstandingPrincipal	1.000
CY2020Q4	ago	Specialty Insuranceand Reinsurance Gross Par SpecialtyInsuranceandReinsuranceGrossPar	1484000000	USD
CY2019Q4	ago	Specialty Insuranceand Reinsurance Gross Par SpecialtyInsuranceandReinsuranceGrossPar	1444000000	USD
CY2020Q4	ago	Specialty Insuranceand Reinsurance Net Par SpecialtyInsuranceandReinsuranceNetPar	928000000	USD
CY2019Q4	ago	Specialty Insuranceand Reinsurance Net Par SpecialtyInsuranceandReinsuranceNetPar	1141000000	USD
CY2020	ago	Insured Financial Obligations Insured Credit Performanceof Guaranteed Obligations Term InsuredFinancialObligationsInsuredCreditPerformanceofGuaranteedObligationsTerm	P30Y
CY2020	ago	Insured Financial Obligations Claim Liability Weighted Average Risk Free Discount Rate InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0060
CY2019	ago	Insured Financial Obligations Claim Liability Weighted Average Risk Free Discount Rate InsuredFinancialObligationsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0194
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
CY2020	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	9000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Accretion Of Discount GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesAccretionOfDiscount	22000000	USD
CY2020	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	13000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Discount Rates GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInDiscountRates	-11000000	USD
CY2020	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	123000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties Changes In Timing And Assumptions GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarrantiesChangesInTimingAndAssumptions	-12000000	USD
CY2020	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	145000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-1000000	USD
CY2020	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	353000000	USD
CY2019	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	445000000	USD
CY2020Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	529000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2020	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	145000000	USD
CY2020	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	353000000	USD
CY2020Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	529000000	USD
CY2018Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	1183000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-1000000	USD
CY2019	ago	Guarantor Obligations Liability For Unpaid Claims And Claims Adjustment Expense Claims Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsLiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidAfterRecoveriesforRepresentationsandWarranties	445000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2020	ago	Reinsurance Recoverables Periodafter Endof Reporting Periodfor Settlementof Ceded Paid Losses ReinsuranceRecoverablesPeriodafterEndofReportingPeriodforSettlementofCededPaidLosses	P45D
CY2020	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	25000000	USD
CY2019	ago	Insured Financial Obligations Liabilityfor Unpaid Claims Adjustment Expense Claims Paid InsuredFinancialObligationsLiabilityforUnpaidClaimsAdjustmentExpenseClaimsPaid	35000000	USD
CY2020Q4	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	23000000	USD
CY2019Q4	ago	Expected Loss Adjustment Expense To Be Paid ExpectedLossAdjustmentExpenseToBePaid	33000000	USD
CY2020Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	529000000	USD
CY2019Q4	ago	Guarantor Obligations Net Expected Losstobe Paid After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLosstobePaidAfterRecoveriesforRepresentationsandWarranties	737000000	USD
CY2020	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	145000000	USD
CY2019	ago	Guarantor Obligations Net Expected Loss Development After Recoveriesfor Representationsand Warranties GuarantorObligationsNetExpectedLossDevelopmentAfterRecoveriesforRepresentationsandWarranties	-1000000	USD
CY2020	ago	Liquidation Rate Review Period LiquidationRateReviewPeriod	P12M
CY2019	ago	Guarantor Obligations Projected Loss Assumptions Numberof Scenarios Considered GuarantorObligationsProjectedLossAssumptionsNumberofScenariosConsidered	5	scenario
CY2020	ago	Guarantor Obligations Projected Loss Assumptions Numberof Scenarios Considered GuarantorObligationsProjectedLossAssumptionsNumberofScenariosConsidered	5	scenario
CY2020	ago	Additional Loss Recovery Assumption Recovery Period AdditionalLossRecoveryAssumptionRecoveryPeriod	P5Y
CY2020Q4	ago	Loss Recovery Assumption Additional Increasein Recovery Projection Percent LossRecoveryAssumptionAdditionalIncreaseinRecoveryProjectionPercent	0.30
CY2020Q4	ago	Loss Recovery Assumption Additional Increasein Recovery Projection Economic Benefit LossRecoveryAssumptionAdditionalIncreaseinRecoveryProjectionEconomicBenefit	49000000	USD
CY2020Q4	ago	Loss Recovery Assumption Additional Decreasein Recovery Projection Percent LossRecoveryAssumptionAdditionalDecreaseinRecoveryProjectionPercent	0.10
CY2020Q4	ago	Loss Recovery Assumption Additional Decreasein Recovery Projection Economic Loss LossRecoveryAssumptionAdditionalDecreaseinRecoveryProjectionEconomicLoss	49000000	USD
CY2020	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	334000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	331000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Scheduled Net Earned Premiums FinancialGuaranteeInsuranceContractsScheduledNetEarnedPremiums	367000000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	129000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	122000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Accelerated Premium Revenue Amount FinancialGuaranteeInsuranceContractsAcceleratedPremiumRevenueAmount	159000000	USD
CY2020	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-20000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-17000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Net Premiums Receivable Adjustment Accretionof Discounton Net Premium Receivable FinancialGuaranteeInsuranceContractsNetPremiumsReceivableAdjustmentAccretionofDiscountonNetPremiumReceivable	-18000000	USD
CY2020	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	483000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	470000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Premiums Earned Net FinancialGuaranteeInsuranceContractsPremiumsEarnedNet	544000000	USD
CY2020	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	2000000	USD
CY2019	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	6000000	USD
CY2018	ago	Premiums Earned Net Specialty Insuranceand Reinsurance PremiumsEarnedNetSpecialtyInsuranceandReinsurance	4000000	USD
CY2020	us-gaap	Premiums Earned Net PremiumsEarnedNet	485000000	USD
CY2019	us-gaap	Premiums Earned Net PremiumsEarnedNet	476000000	USD
CY2018	us-gaap	Premiums Earned Net PremiumsEarnedNet	548000000	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
CY2017Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	915000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	2000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2017Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	1284000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	903000000	USD
CY2017Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	914000000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	462000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	689000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable New Business Written FinancialGuaranteeInsuranceContractsPremiumReceivableNewBusinessWritten	610000000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	426000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	318000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable Proceeds From Premiums Received FinancialGuaranteeInsuranceContractsPremiumReceivableProceedsFromPremiumsReceived	577000000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-10000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-21000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Change In Period Of Contract FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentChangeInPeriodOfContract	-8000000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	18000000	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	10000000	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Accretion Of Discount On Premium Receivable FinancialGuaranteeInsuranceContractsPremiumsReceivableAccretionOfDiscountOnPremiumReceivable	9000000	USD
CY2020	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	43000000	USD
CY2019	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	21000000	USD
CY2018	ago	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment Foreign Exchange Translation FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustmentForeignExchangeTranslation	-35000000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustment	0	USD
CY2019	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustment	0	USD
CY2018	us-gaap	Financial Guarantee Insurance Contracts Premiums Receivable Adjustment FinancialGuaranteeInsuranceContractsPremiumsReceivableAdjustment	-10000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	1371000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	1284000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Excluding Other FinancialGuaranteeInsuranceContractsPremiumReceivableExcludingOther	903000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2019Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	2000000	USD
CY2018Q4	ago	Financial Guarantee Insurance Contracts Premium Receivable Other FinancialGuaranteeInsuranceContractsPremiumReceivableOther	1000000	USD
CY2020Q4	us-gaap	Financial Guarantee Insurance Contracts Premium Receivable FinancialGuaranteeInsuranceContractsPremiumReceivable	1372000000	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	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	111000000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	105000000	USD
CY2017Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	101000000	USD
CY2020	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	24000000	USD
CY2019	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	23000000	USD
CY2018	us-gaap	Deferred Policy Acquisition Costs Additions DeferredPolicyAcquisitionCostsAdditions	19000000	USD
CY2020	ago	Deferred Policy Acquisition Cost Amortization Expense Including Accretion Of Discount On Commissions DeferredPolicyAcquisitionCostAmortizationExpenseIncludingAccretionOfDiscountOnCommissions	16000000	USD
CY2019	ago	Deferred Policy Acquisition Cost Amortization Expense Including Accretion Of Discount On Commissions DeferredPolicyAcquisitionCostAmortizationExpenseIncludingAccretionOfDiscountOnCommissions	17000000	USD
CY2018	ago	Deferred Policy Acquisition Cost Amortization Expense Including Accretion Of Discount On Commissions DeferredPolicyAcquisitionCostAmortizationExpenseIncludingAccretionOfDiscountOnCommissions	15000000	USD
CY2020Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	119000000	USD
CY2019Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	111000000	USD
CY2018Q4	us-gaap	Deferred Policy Acquisition Costs DeferredPolicyAcquisitionCosts	105000000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0060
CY2019	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0194
CY2020Q4	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	122000000	USD
CY2019Q4	ago	Reserve For Losses And Loss Adjustment Expenses Net Of Reinsurance And Salvage And Subrogation Recoveries ReserveForLossesAndLossAdjustmentExpensesNetOfReinsuranceAndSalvageAndSubrogationRecoveries	295000000	USD
CY2020Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1088000000	USD
CY2019Q4	us-gaap	Liability For Claims And Claims Adjustment Expense LiabilityForClaimsAndClaimsAdjustmentExpense	1050000000	USD
CY2020Q4	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
CY2020Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1080000000	USD
CY2019Q4	us-gaap	Liability For Unpaid Claims And Claims Adjustment Expense Net LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet	1012000000	USD
CY2020Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	991000000	USD
CY2019Q4	us-gaap	Salvage And Subrogation Recoveries Value SalvageAndSubrogationRecoveriesValue	747000000	USD
CY2020Q4	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	33000000	USD
CY2019Q4	ago	Ceded Salvage And Subrogation Recoveries Value CededSalvageAndSubrogationRecoveriesValue	30000000	USD
CY2020Q4	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-958000000	USD
CY2019Q4	ago	Reservefor Lossesand Loss Adjustment Expenses Netof Reinsuranceand Salvageand Subrogation Including Other Recoverables ReserveforLossesandLossAdjustmentExpensesNetofReinsuranceandSalvageandSubrogationIncludingOtherRecoverables	-717000000	USD
CY2020Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	122000000	USD
CY2019Q4	ago	Liabilityfor Unpaid Claimsand Claims Adjustment Expense Netof Reinsuranceand Salvage Subrogationand Other Recoveries LiabilityforUnpaidClaimsandClaimsAdjustmentExpenseNetofReinsuranceandSalvageSubrogationandOtherRecoveries	295000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During First Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFirstQuarterFollowingBalanceSheetDate	8000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Second Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringSecondQuarterFollowingBalanceSheetDate	9000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Third Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringThirdQuarterFollowingBalanceSheetDate	9000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Fourth Quarter Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFourthQuarterFollowingBalanceSheetDate	8000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed During Fiscal Year Following Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedDuringFiscalYearFollowingBalanceSheetDate	34000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Second Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinSecondFullFiscalYear	35000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Third Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinThirdFullFiscalYear	32000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fourth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFourthFullFiscalYear	32000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensedin Fifth Full Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedinFifthFullFiscalYear	30000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan Fiveand Within10 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethanFiveandWithin10YearsfromBalanceSheetDate	123000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan10andwithin15 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan10andwithin15YearsfromBalanceSheetDate	75000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Morethan15andwithin20 Yearsfrom Balance Sheet Date FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedMorethan15andwithin20YearsfromBalanceSheetDate	18000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Future Expected Net Losstobe Expensed Beyond Twentieth Fiscal Year FinancialGuaranteeInsuranceContractsFutureExpectedNetLosstobeExpensedBeyondTwentiethFiscalYear	4000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Present Value FinancialGuaranteeInsuranceContractsNetLosstobeExpensedPresentValue	383000000	USD
CY2020Q4	ago	Scheduleof Insured Financial Obligationswith Credit Deterioration Reductionsof Gross Claim Liability Netof Reinsurance Recoverable Discount ScheduleofInsuredFinancialObligationswithCreditDeteriorationReductionsofGrossClaimLiabilityNetofReinsuranceRecoverableDiscount	104000000	USD
CY2020Q4	ago	Financial Guarantee Insurance Contracts Net Losstobe Expensed Undiscounted FinancialGuaranteeInsuranceContractsNetLosstobeExpensedUndiscounted	487000000	USD
CY2020	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	203000000	USD
CY2019	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	93000000	USD
CY2018	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	64000000	USD
CY2020	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P11Y10M24D
CY2019	us-gaap	Average Term Of Credit Risk Derivatives1 AverageTermOfCreditRiskDerivatives1	P11Y6M
CY2020Q4	ago	Financial Guaranty Contracts Accountedforas Credit Derivatives Outstanding Principal Amount FinancialGuarantyContractsAccountedforasCreditDerivativesOutstandingPrincipalAmount	5371000000	USD
CY2020Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-100000000	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
CY2020Q4	ago	Expected Losson Credit Derivativeto Be Paid Recovered Including Representationand Warranty Liability Benefit ExpectedLossonCreditDerivativetoBePaidRecoveredIncludingRepresentationandWarrantyLiabilityBenefit	-1000000	USD
CY2019Q4	ago	Expected Losson Credit Derivativeto Be Paid Recovered Including Representationand Warranty Liability Benefit ExpectedLossonCreditDerivativetoBePaidRecoveredIncludingRepresentationandWarrantyLiabilityBenefit	-4000000	USD
CY2020	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	6000000	USD
CY2019	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	8000000	USD
CY2018	ago	Credit Derivative Realized Gains CreditDerivativeRealizedGains	9000000	USD
CY2020	ago	Credit Derivative Losses CreditDerivativeLosses	10000000	USD
CY2019	ago	Credit Derivative Losses CreditDerivativeLosses	35000000	USD
CY2018	ago	Credit Derivative Losses CreditDerivativeLosses	25000000	USD
CY2020	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-4000000	USD
CY2019	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-27000000	USD
CY2018	ago	Credit Derivative Realized Gain Lossand Other Settlements CreditDerivativeRealizedGainLossandOtherSettlements	-16000000	USD
CY2020	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	85000000	USD
CY2019	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	21000000	USD
CY2018	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	128000000	USD
CY2020	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	81000000	USD
CY2019	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	-6000000	USD
CY2018	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	112000000	USD
CY2020Q4	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-313000000	USD
CY2019Q4	ago	Credit Risk Derivatives At Fair Value Before Effect Of Credit Spread Net CreditRiskDerivativesAtFairValueBeforeEffectOfCreditSpreadNet	-261000000	USD
CY2020Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	213000000	USD
CY2019Q4	us-gaap	Derivative Credit Risk Valuation Adjustment Derivative Liabilities DerivativeCreditRiskValuationAdjustmentDerivativeLiabilities	76000000	USD
CY2020Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-100000000	USD
CY2019Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	-185000000	USD
CY2020	us-gaap	Direct Premiums Written DirectPremiumsWritten	453000000	USD
CY2019	us-gaap	Direct Premiums Written DirectPremiumsWritten	663000000	USD
CY2018	us-gaap	Direct Premiums Written DirectPremiumsWritten	288000000	USD
CY2020	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	1000000	USD
CY2019	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	14000000	USD
CY2018	us-gaap	Assumed Premiums Written AssumedPremiumsWritten	324000000	USD
CY2020	us-gaap	Ceded Premiums Written CededPremiumsWritten	-13000000	USD
CY2019	us-gaap	Ceded Premiums Written CededPremiumsWritten	-10000000	USD
CY2018	us-gaap	Ceded Premiums Written CededPremiumsWritten	-14000000	USD
CY2020	us-gaap	Premiums Written Net PremiumsWrittenNet	467000000	USD
CY2019	us-gaap	Premiums Written Net PremiumsWrittenNet	687000000	USD
CY2018	us-gaap	Premiums Written Net PremiumsWrittenNet	626000000	USD
CY2020	us-gaap	Direct Premiums Earned DirectPremiumsEarned	448000000	USD
CY2019	us-gaap	Direct Premiums Earned DirectPremiumsEarned	429000000	USD
CY2018	us-gaap	Direct Premiums Earned DirectPremiumsEarned	509000000	USD
CY2020	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	41000000	USD
CY2019	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	54000000	USD
CY2018	us-gaap	Assumed Premiums Earned AssumedPremiumsEarned	51000000	USD
CY2020	us-gaap	Ceded Premiums Earned CededPremiumsEarned	4000000	USD
CY2019	us-gaap	Ceded Premiums Earned CededPremiumsEarned	7000000	USD
CY2018	us-gaap	Ceded Premiums Earned CededPremiumsEarned	12000000	USD
CY2020	us-gaap	Premiums Earned Net PremiumsEarnedNet	485000000	USD
CY2019	us-gaap	Premiums Earned Net PremiumsEarnedNet	476000000	USD
CY2018	us-gaap	Premiums Earned Net PremiumsEarnedNet	548000000	USD
CY2020	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	182000000	USD
CY2019	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	101000000	USD
CY2018	us-gaap	Policyholder Benefits And Claims Incurred Gross PolicyholderBenefitsAndClaimsIncurredGross	68000000	USD
CY2020	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	24000000	USD
CY2019	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	2000000	USD
CY2018	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Assumed ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountAssumed	-1000000	USD
CY2020	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	3000000	USD
CY2019	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	10000000	USD
CY2018	us-gaap	Reinsurance Effect On Claims And Benefits Incurred Amount Ceded ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded	3000000	USD
CY2020	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	203000000	USD
CY2019	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	93000000	USD
CY2018	us-gaap	Policyholder Benefits And Claims Incurred Net PolicyholderBenefitsAndClaimsIncurredNet	64000000	USD
CY2018	ago	Increase Decrease In Unearned Premiums Due To Commutations IncreaseDecreaseInUnearnedPremiumsDueToCommutations	64000000	USD
CY2020Q4	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	4000000	USD
CY2019Q4	ago	Ceded Premium Payable Netof Commissions CededPremiumPayableNetofCommissions	20000000	USD
CY2020Q4	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	-23000000	USD
CY2019Q4	ago	Ceded Expected Loss And Loss Adjustment Expense CededExpectedLossAndLossAdjustmentExpense	11000000	USD
CY2020Q4	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	418000000	USD
CY2019Q4	ago	Insured Financial Obligations Ceded Par Outstanding InsuredFinancialObligationsCededParOutstanding	1349000000	USD
CY2020Q4	ago	Specialty Insuranceand Reinsurance Ceded Par Outstanding SpecialtyInsuranceandReinsuranceCededParOutstanding	556000000	USD
CY2019Q4	ago	Specialty Insuranceand Reinsurance Ceded Par Outstanding SpecialtyInsuranceandReinsuranceCededParOutstanding	303000000	USD
CY2020	ago	Increase Decrease In Unearned Premiums Due To Commutations IncreaseDecreaseInUnearnedPremiumsDueToCommutations	5000000	USD
CY2019	ago	Increase Decrease In Unearned Premiums Due To Commutations IncreaseDecreaseInUnearnedPremiumsDueToCommutations	15000000	USD
CY2020	ago	Increase Decrease In Net Par Due To Commutations IncreaseDecreaseInNetParDueToCommutations	336000000	USD
CY2019	ago	Increase Decrease In Net Par Due To Commutations IncreaseDecreaseInNetParDueToCommutations	1069000000	USD
CY2018	ago	Increase Decrease In Net Par Due To Commutations IncreaseDecreaseInNetParDueToCommutations	1457000000	USD
CY2020	ago	Gain Loss From Commutations GainLossFromCommutations	38000000	USD
CY2019	ago	Gain Loss From Commutations GainLossFromCommutations	1000000	USD
CY2018	ago	Gain Loss From Commutations GainLossFromCommutations	-16000000	USD
CY2020	ago	Minimum Percentageof Declinein Market Valueof Security Below Amortized Cost Consideredfor Assessing Impairmentof Investments MinimumPercentageofDeclineinMarketValueofSecurityBelowAmortizedCostConsideredforAssessingImpairmentofInvestments	0.20
CY2020	ago	Continuous Periodof Declinein Market Valueof Security Consideredfor Assessing Impairmentof Investments ContinuousPeriodofDeclineinMarketValueofSecurityConsideredforAssessingImpairmentofInvestments	P12M
CY2020	ago	Numberof Outside Managers Managing Investment Portfolio NumberofOutsideManagersManagingInvestmentPortfolio	3	manager
CY2020Q4	us-gaap	Short Term Investments ShortTermInvestments	851000000	USD
CY2019Q4	us-gaap	Short Term Investments ShortTermInvestments	1268000000	USD
CY2020Q4	us-gaap	Investments Investments	9838000000	USD
CY2019Q4	us-gaap	Investments Investments	10240000000	USD
CY2020Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	75000000	USD
CY2019Q4	us-gaap	Accrued Investment Income Receivable AccruedInvestmentIncomeReceivable	79000000	USD
CY2020Q4	ago	Percentageof Availableforsale Securitiesat Amortized Cost PercentageofAvailableforsaleSecuritiesatAmortizedCost	1
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	9055000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	78000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	698000000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	51000000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9624000000	USD
CY2020Q4	ago	Accumulated Other Comprehensive Income Loss Otherthan Temporary Impairment Not Credit Loss Before Tax Debt Securities Total AccumulatedOtherComprehensiveIncomeLossOtherthanTemporaryImpairmentNotCreditLossBeforeTaxDebtSecuritiesTotal	-39000000	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
CY2020Q4	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.35
CY2019Q4	ago	Government Agency Obligations As Percentage Of Total Mortgage Backed Securities GovernmentAgencyObligationsAsPercentageOfTotalMortgageBackedSecurities	0.42
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	362000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	3000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	166000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	9000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	528000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	12000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	94	Security
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	46	Security
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	139	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
CY2020Q4	ago	Available For Sale Securities Continuous Unrealized Loss Position Greater Than10 Percent Of Book Value Twelve Months Or Longer Number AvailableForSaleSecuritiesContinuousUnrealizedLossPositionGreaterThan10PercentOfBookValueTwelveMonthsOrLongerNumber	11	Security
CY2020Q4	ago	Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or Longer Greater Than10 Percent Book Value Aggregate Losses AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerGreaterThan10PercentBookValueAggregateLosses	8000000	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
CY2020Q4	us-gaap	Assets Held In Trust AssetsHeldInTrust	262000000	USD
CY2019Q4	us-gaap	Assets Held In Trust AssetsHeldInTrust	280000000	USD
CY2020	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	304000000	USD
CY2019	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	387000000	USD
CY2018	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	404000000	USD
CY2020	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	7000000	USD
CY2019	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	9000000	USD
CY2018	us-gaap	Investment Income Investment Expense InvestmentIncomeInvestmentExpense	9000000	USD
CY2020	us-gaap	Net Investment Income NetInvestmentIncome	297000000	USD
CY2019	us-gaap	Net Investment Income NetInvestmentIncome	378000000	USD
CY2018	us-gaap	Net Investment Income NetInvestmentIncome	395000000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	27000000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4000000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1000000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	42000000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	63000000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	20000000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	11000000	USD
CY2019	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	5000000	USD
CY2018	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	12000000	USD
CY2020	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	4000000	USD
CY2019	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	-1000000	USD
CY2018	ago	Net Realized Investment Gains Losses NetRealizedInvestmentGainsLosses	-1000000	USD
CY2020	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	17000000	USD
CY2019	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	35000000	USD
CY2018	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Writeoff DebtSecuritiesAvailableForSaleAllowanceForCreditLossWriteoff	39000000	USD
CY2020	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	18000000	USD
CY2019	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	22000000	USD
CY2018	us-gaap	Debt Securities Realized Gain Loss DebtSecuritiesRealizedGainLoss	-32000000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	185000000	USD
CY2017Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	162000000	USD
CY2020	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Not Previously Recorded DebtSecuritiesAvailableForSaleAllowanceForCreditLossNotPreviouslyRecorded	1000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions No Previous Impairment OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsNoPreviousImpairment	0	USD
CY2020	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Securities Sold DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold	0	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	15000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Securities Sold OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSecuritiesSold	0	USD
CY2020	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss Purchased With Credit Deterioration Increase DebtSecuritiesAvailableForSaleAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease	15000000	USD
CY2019	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	16000000	USD
CY2018	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Additional Credit Losses OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionsAdditionalCreditLosses	23000000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	78000000	USD
CY2019Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	186000000	USD
CY2018Q4	us-gaap	Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld	185000000	USD
CY2020Q4	ago	Variable Interest Entity Other Consolidated Carrying Amount Assets VariableInterestEntityOtherConsolidatedCarryingAmountAssets	96000000	USD
CY2020Q4	ago	Variable Interest Entity Other Consolidated Carrying Amount Liabilities VariableInterestEntityOtherConsolidatedCarryingAmountLiabilities	3000000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	89000000	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
CY2020Q4	ago	Variable Interest Entity Numberof Policies Monitored VariableInterestEntityNumberofPoliciesMonitored	17000	policy
CY2020Q4	ago	Variable Interest Entity Numberof Policies Monitored Not Withinthe Scopeof Asc810 VariableInterestEntityNumberofPoliciesMonitoredNotWithintheScopeofASC810	15000	policy
CY2020Q4	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	79	policy
CY2019Q4	ago	Variable Interest Entity Numberof Policiesthat Contain Provisionsfor Consolidation VariableInterestEntityNumberofPoliciesthatContainProvisionsforConsolidation	90	policy
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	22000000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	117000000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	117000000	USD
CY2020	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P6Y2M12D
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	82000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	82000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	18000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	5000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	64000000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	77000000	USD
CY2020Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	22000000	USD
CY2019Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	22000000	USD
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	203000000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	216000000	USD
CY2020Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	107000000	USD
CY2019Q4	us-gaap	Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	115000000	USD
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	13000000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	3000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	12000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	11000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	11000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	10000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	6000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	14000000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	64000000	USD
CY2020Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1429000000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	1224000000	USD
CY2019Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1453000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	1235000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	1000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	500000000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	1000000	USD
CY2020Q4	ago	Long Term Debt Maturities Repayments Of Principal In Years Six Through Twenty Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsSixThroughTwentyFive	201000000	USD
CY2020Q4	ago	Long Term Debt Maturities Repayments Of Principal In Years Twenty Six Through Forty Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsTwentySixThroughFortyFive	0	USD
CY2020Q4	ago	Long Term Debt Maturities Repayments Of Principal In Years Forty Six Through Sixty Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearsFortySixThroughSixtyFive	296000000	USD
CY2020Q4	ago	Long Term Debt Maturities Repayments Of Principal After Year Sixty Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearSixtyFive	430000000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1429000000	USD
CY2020	us-gaap	Interest Expense Debt InterestExpenseDebt	85000000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	89000000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	94000000	USD
CY2020	ago	Share Basedand Employee Stock Purchase Plan Expense Netof Capitalized Costs ShareBasedandEmployeeStockPurchasePlanExpenseNetofCapitalizedCosts	25000000	USD
CY2019	ago	Share Basedand Employee Stock Purchase Plan Expense Netof Capitalized Costs ShareBasedandEmployeeStockPurchasePlanExpenseNetofCapitalizedCosts	21000000	USD
CY2018	ago	Share Basedand Employee Stock Purchase Plan Expense Netof Capitalized Costs ShareBasedandEmployeeStockPurchasePlanExpenseNetofCapitalizedCosts	19000000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1200000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	1100000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount	800000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4000000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3000000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3000000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	20000000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	12000000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	12000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	12000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	100000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	17000000	USD
CY2020Q4	ago	Deferred Tax Assets Liabilities Net Current1 DeferredTaxAssetsLiabilitiesNetCurrent1	21000000	USD
CY2019Q4	ago	Deferred Tax Assets Liabilities Net Current1 DeferredTaxAssetsLiabilitiesNetCurrent1	47000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	56000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Unearned Premiums Reserve DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsUnearnedPremiumsReserve	76000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	47000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Investments DeferredTaxAssetsInvestments	48000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Rent DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent	24000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Rent DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsDeferredRent	24000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	24000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	36000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	33000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	32000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	29000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	26000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	31000000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	217000000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	273000000	USD
CY2020Q4	ago	Deferred Tax Liabilities Unrealized Gains On Investments DeferredTaxLiabilitiesUnrealizedGainsOnInvestments	102000000	USD
CY2019Q4	ago	Deferred Tax Liabilities Unrealized Gains On Investments DeferredTaxLiabilitiesUnrealizedGainsOnInvestments	86000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	41000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	44000000	USD
CY2020Q4	ago	Deferred Tax Liabilities Market Discount DeferredTaxLiabilitiesMarketDiscount	42000000	USD
CY2019Q4	ago	Deferred Tax Liabilities Market Discount DeferredTaxLiabilitiesMarketDiscount	11000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	22000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Policy Acquisition Cost DeferredTaxLiabilitiesDeferredExpenseDeferredPolicyAcquisitionCost	33000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Reserves And Accruals DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals	44000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Reserves And Accruals DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals	29000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	17000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	19000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	25000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	32000000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	293000000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	254000000	USD
CY2020Q4	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	24000000	USD
CY2019Q4	us-gaap	Tax Credit Carryforward Valuation Allowance TaxCreditCarryforwardValuationAllowance	36000000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	100000000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	17000000	USD
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	156000000	USD
CY2020Q4	ago	Tax Cutsand Jobs Actof2017 Deferred Tax Assets Tax Credit Carryforwards Foreign TaxCutsandJobsActof2017DeferredTaxAssetsTaxCreditCarryforwardsForeign	23600000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	23600000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Acquisition UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	12800000	USD
CY2020	ago	Deferred Tax Assets Realization Assessment Period For Which Cumulative Operating Income Considered DeferredTaxAssetsRealizationAssessmentPeriodForWhichCumulativeOperatingIncomeConsidered	P3Y
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	83000000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	91000000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	97000000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	20000000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	19000000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	23000000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-17000000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	1000000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Contingencies IncomeTaxReconciliationTaxContingencies	-15000000	USD
CY2020	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-7000000	USD
CY2019	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-6000000	USD
CY2018	us-gaap	Income Tax Reconciliation Prior Year Income Taxes IncomeTaxReconciliationPriorYearIncomeTaxes	-1000000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4000000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1000000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	6000000	USD
CY2020	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	9000000	USD
CY2019	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	-5000000	USD
CY2018	ago	Effective Income Tax Rate Reconciliation Taxeson Reinsurance Amount EffectiveIncomeTaxRateReconciliationTaxesonReinsuranceAmount	6000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
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CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-4000000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-3000000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	6000000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4000000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-7000000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	45000000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	63000000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	59000000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.109
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.137
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.102
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	413000000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	464000000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	580000000	USD
CY2020	us-gaap	Revenues Revenues	1115000000	USD
CY2019	us-gaap	Revenues Revenues	963000000	USD
CY2018	us-gaap	Revenues Revenues	1001000000	USD
CY2017Q2	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	17000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15000000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	17000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1000000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	15000000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	4000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	15000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	15000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	14000000	USD
CY2020	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
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	1000000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	0	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	69000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16000000	USD
CY2020	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	3400000	USD
CY2019	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	3800000	USD
CY2018	us-gaap	Related Party Transaction Expenses From Transactions With Related Party RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty	4000000.0	USD
CY2020Q4	us-gaap	Due From Related Parties DueFromRelatedParties	9000000	USD
CY2020Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	1000000	USD
CY2019Q4	us-gaap	Due From Related Parties DueFromRelatedParties	1000000	USD
CY2019Q4	us-gaap	Due To Related Parties Current And Noncurrent DueToRelatedPartiesCurrentAndNoncurrent	1000000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	2000000	USD
CY2019Q1	ago	Derecognized Deferred Rent And Lease Incentive Liabilities DerecognizedDeferredRentAndLeaseIncentiveLiabilities	26000000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	78000000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	118000000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y8M12D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0265
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	1000000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	1000000	USD
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0173
CY2020Q4	ago	Financeand Operating Lease Rightof Use Asset FinanceandOperatingLeaseRightofUseAsset	79000000	USD
CY2020Q4	ago	Financeand Operating Lease Liability FinanceandOperatingLeaseLiability	119000000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	100000000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	130000000	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y4M24D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0261
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	2000000	USD
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P1Y9M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0174
CY2019Q4	ago	Financeand Operating Lease Rightof Use Asset FinanceandOperatingLeaseRightofUseAsset	102000000	USD
CY2019Q4	ago	Financeand Operating Lease Liability FinanceandOperatingLeaseLiability	132000000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	600000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	100000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	30000000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	10000000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	2000000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	2000000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1000000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	0	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1000000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	0	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	3000000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	0	USD
CY2020	us-gaap	Lease Cost LeaseCost	31000000	USD
CY2019	us-gaap	Lease Cost LeaseCost	12000000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	19000000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	11000000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1000000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4000000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	37000000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	2000000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	13000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	9000000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	13000000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	19000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	1000000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	20000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	20000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	11000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	9000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	55000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	0	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	134000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	1000000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	16000000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	0	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	118000000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	1000000	USD
CY2020Q4	ago	Lessee Operating Lease Lease Not Yet Commenced Liability To Be Paid LesseeOperatingLeaseLeaseNotYetCommencedLiabilityToBePaid	32000000	USD
CY2020Q4	ago	Common Stock Shares Authorized Value CommonStockSharesAuthorizedValue	5000000	USD
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	500000000	shares
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020	ago	Common Stock Voting Rights Numberof Votesper Share CommonStockVotingRightsNumberofVotesperShare	1	vote
CY2020	ago	Percentageof Controlled Sharesas Determined Pursuantto Section958 PercentageofControlledSharesasDeterminedPursuanttoSection958	0.095
CY2020	ago	Percentageof Voting Power Heldby One Shareholder PercentageofVotingPowerHeldbyOneShareholder	0.75
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.20
CY2020	us-gaap	Net Income Loss NetIncomeLoss	362000000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	402000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	521000000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	361000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	401000000	USD
CY2020	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1000000	USD
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1000000	USD
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	1000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	169000000	USD
CY2020	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-13000000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	156000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	268000000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-19000000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	249000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-279000000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	32000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-247000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	520000000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85500000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	99300000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110000000.0	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.22
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.04
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.73
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	361000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	401000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	520000000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2019	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2018	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Diluted UndistributedEarningsLossAllocatedToParticipatingSecuritiesDiluted	0	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	361000000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	401000000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	520000000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	85500000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	99300000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	110000000.0	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	700000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	900000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1300000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	86200000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	100200000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	111300000	shares
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.19
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.00
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.68
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	800000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	100000	shares

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2019 Q4 Form 10-K Financial Statement

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$AGO ASSURED GUARANTY LTD Stock $ago

2019 Q4 Form 10-K Financial Statement

#000127381321000004 Filed on February 26, 2021

Income Statement

Balance Sheet

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Facts In Submission

Files In Submission

$AGO
ASSURED GUARANTY LTD Stock $ago