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Financial Guarantee Insurance Contracts - Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) (Detail)
€ in Millions, £ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Jan. 01, 2020
USD ($)
Insurance [Line Items]                
Premium Receivable, Allowance for Credit Loss $ 17              
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]                
Beginning premium receivable 416     $ 495     $ 586  
Premium receipts 46     48     (56)  
Adjustments for changes in expected and contractual cash flows (6)     (38)     (42)  
Accretion of premium receivable discount 9     11     15  
Financial Guarantee Insurance Contracts, Premium Receivable, Deconsolidation of VIE 0     3        
Uncollectable premiums (4)     (2)     2  
Other adjustments (including foreign exchange) 5     (6)     (10)  
Ending premium receivable 370     416     495  
Allowance for Doubtful Accounts, Premiums and Other Receivables 17     9        
Premium Receivable, Credit Loss Expense (Reversal) 9              
Premium Receivable, Allowance for Credit Loss, Writeoff (2)              
Premium Receivable, Allowance for Credit Loss, Recovery 0              
Financing Receivable, Past Due 0              
Financing Receivable, 90 Days or More Past Due, Still Accruing 0              
Accounting Standards Update 2016-13 [Member]                
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]                
Cumulative Effect of New Accounting Principle in Period of Adoption (4)              
Accounting Standards Update 2016-13 [Member] | Premiums Receivable [Member]                
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]                
Cumulative Effect of New Accounting Principle in Period of Adoption               $ (3)
United Kingdom, Pounds                
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]                
Beginning premium receivable 129 £ 97   131 £ 103      
Ending premium receivable 117 £ 86   129 £ 97   131  
Euro Member Countries, Euro                
Financial Guarantee Insurance Contracts, Premium Receivable [Roll Forward]                
Beginning premium receivable 26   € 23 31   € 27    
Ending premium receivable $ 19   € 16 $ 26   € 23 $ 31