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Employee Benefit Plans (Benefit Payments Expected Future Service) (Detail)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 556
2025 546
2026 554
2027 562
2028 571
2029-2033 2,958
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 94
2025 91
2026 90
2027 89
2028 87
2029-2033 $ 418