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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ 1 $ 1 $ 1  
Loss Reserves Ceded To Reinsurers 29 36 33 $ 26
Policyholder Benefits and Claims Incurred, Ceded (2) 14    
Liability for Unpaid Claims and Claims Adjustment Expense, Net (577) (429) (430) (508)
Subrogation recoverable (2,113)   (2,156)  
Claim liability reported on Balance Sheet, before reinsurance (549)   (397)  
Liability For Unpaid Claims And Claims Adjustment Expense (Gross of Subrogation Recoverable) 1,565   1,759  
Liability for Claims and Claims Adjustment Expense (549) $ (393) (397) $ (482)
Present Value of Expected Net Cash Flows- Claims and Loss Expenses [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Subrogation recoverable 87   100  
Present Value of Expected Net Cash Flows-Recoveries (2,355)   (2,486)  
Liability For Unpaid Claims And Claims Adjustment Expense (Gross of Subrogation Recoverable) 1,778   2,060  
Liability for Claims and Claims Adjustment Expense 1,865   2,160  
Present Value of Expected Net Cash Flows-Recoveries [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Subrogation recoverable (2,200)   (2,256)  
Liability For Unpaid Claims And Claims Adjustment Expense (Gross of Subrogation Recoverable) (156)   (229)  
Unearned Premium Reserve [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Subrogation recoverable 0   0  
Liability For Unpaid Claims And Claims Adjustment Expense (Gross of Subrogation Recoverable) (58)   (72)  
Liability for Claims and Claims Adjustment Expense $ (58)   $ (72)