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Employee Benefit Plans (Benefit Payments Expected Future Service) (Detail)
$ in Millions
Dec. 31, 2022
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 $ 518
2024 527
2025 542
2026 551
2027 560
2028-2032 2,925
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 99
2024 97
2025 96
2026 94
2027 93
2028-2032 $ 433