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Financial Guarantee Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]          
Beginning gross loss and loss expense reserves $ (397) $ (482)      
Less reinsurance on loss and loss expense reserves 33 26      
Beginning balance of net loss and loss expense reserves (430) (508)      
Current Year Claims and Claims Adjustment Expense 0 27      
Prior Year Claims and Claims Adjustment Expense 8 90      
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 8 117      
Claim and loss expense payments, net of subrogation and reinsurance 0 0      
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance (25) (39)      
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 25 39      
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) 0 0      
Liability for Unpaid Claims and Claims Adjustment Expense, Net (430) (508) $ (447) $ (430) $ (430)
Add reinsurance on loss and loss expense reserves 33 35      
Ending gross loss and loss expense reserves (414) (395)      
Policyholder Benefits and Claims Incurred, Ceded 1 10      
Net Incurred RMBS Subrogation Recoveries $ (3) $ 36      
Ceded Loss And Loss Expenses Paid Not Yet Recovered     $ 0 $ 1 $ 1