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Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement charge $ 0 $ 0 $ (1,470)
Pension settlement charge 0 0 1,470
Qualified Defined  Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost (60) (65) (87)
Interest cost (1,398) (1,459) (1,289)
Expected return on plan assets 1,572 1,722 1,854
Amortization of net actuarial (losses) gains (259) (168) (425)
Amortization of prior service credits (costs) 147 348 359
Pension settlement charge 0 0 (1,470)
Non-service FAS income (expense) 62 443 (971)
Total FAS income (expense) 2 378 (1,058)
Pension settlement charge 0 0 1,470
Retiree Medical and Life Insurance Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost (5) (5) (9)
Interest cost (63) (68) (49)
Expected return on plan assets 107 103 136
Amortization of net actuarial (losses) gains 35 31 46
Amortization of prior service credits (costs) (4) (10) (27)
Pension settlement charge 0 0 0
Non-service FAS income (expense) 75 56 106
Total FAS income (expense) 70 51 97
Pension settlement charge $ 0 $ 0 $ 0