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Financial Guarantee Insurance Contracts - Estimated Future Amortization Expense for Insurance Intangible Asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amortization Of Intangible Assets [Line Items]      
Amortization of intangible assets $ 29 $ 47 $ 55
2018 30    
2019 28    
2020 26    
2021 24    
2022 22    
Thereafter 162    
Intangible assets, less accumulated amortization $ 307 326  
Insurance Intangible Asset [Member]      
Amortization Of Intangible Assets [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 7 years 1 month 6 days    
Amortization of intangible assets $ 25 44 $ 52
Intangible Assets, Gross (Excluding Goodwill) 1,258 1,247  
2018 26    
2019 24    
2020 22    
2021 20    
2022 18    
Thereafter 136    
Finite-Lived Intangible Assets, Accumulated Amortization 1,013 981  
Intangible assets, less accumulated amortization $ 245 $ 266