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Financial Guarantees in Force - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Guarantor Obligations [Line Items]      
Financial Guarantee Insurance Contracts, Accelerated Premium Revenue, Amount $ 8 $ 1 $ 12
Gross par amount of financial guarantees outstanding 27,551 34,122  
Net par amount of financial guarantees 22,613 28,020  
Gross financial guarantees in force 44,734 54,272  
Net financial guarantees in force $ 34,975 42,653  
Highest single insured risk of aggregate net par amount guaranteed 3.60%    
Ceded Principal Outstanding Major Reinsurer Percentage 7.90%    
Public Finance [Member]      
Guarantor Obligations [Line Items]      
Net par amount of financial guarantees $ 10,547 12,360  
Public Finance [Member] | Housing Revenue [Member]      
Guarantor Obligations [Line Items]      
Net par amount of financial guarantees 5,491 5,610  
Military Housing [Member] | Public Finance [Member] | Housing Revenue [Member]      
Guarantor Obligations [Line Items]      
Net par amount of financial guarantees $ 5,400 $ 5,490