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Other Intangible Assets - Estimated Amortization Expense for VOBA in Future Fiscal Periods (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]      
2024 $ 149    
2025 139    
2026 127    
2027 116    
2028 105    
Thereafter 810    
Total $ 1,446 $ 1,615 $ 1,743