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Employee Benefit Plans (Benefit Payments Expected Future Service) (Detail)
$ in Millions
Dec. 31, 2024
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 $ 537
2026 539
2027 546
2028 555
2029 561
2030-2034 2,871
Other Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2025 89
2026 88
2027 87
2028 85
2029 84
2030-2034 $ 403