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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
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Policyholder Benefits and Claims Incurred, Ceded $ (5) $ 11 $ 7  
Liability for Unpaid Claims and Claims Adjustment Expense, Net (577) (430) (436) $ (130)
Subrogation recoverable (2,092) (2,156)    
Claim liability reported on Balance Sheet, before reinsurance (522) (397)    
Liability for Claims and Claims Adjustment Expense 1,570 1,759 $ (482) $ (107)
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 88 100    
Claim liability reported on Balance Sheet, before reinsurance 1,869 2,160    
Liability for Claims and Claims Adjustment Expense 1,781 2,060    
Present Value of Expected Net Cash Flows-Recoveries [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Subrogation recoverable (2,180) (2,256)    
Claim liability reported on Balance Sheet, before reinsurance (2,335) (2,486)    
Liability for Claims and Claims Adjustment Expense (155) (229)    
Unearned Premium Reserve [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Subrogation recoverable 0 0    
Claim liability reported on Balance Sheet, before reinsurance (56) (72)    
Liability for Claims and Claims Adjustment Expense $ (56) $ (72)