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Other Intangible Assets - Estimated Amortization Expense for VOBA in Future Fiscal Periods (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]      
2025 $ 145    
2026 132    
2027 121    
2028 110    
2029 100    
Thereafter 741    
Total $ 1,349 $ 1,446 $ 1,615