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Postretirement Benefit Plans - Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost $ 342 $ (684) $ 2,022
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost (2) (5) (149)
Incurred but Not Yet Recognized in FAS Expense 340 (689) 1,873
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts (188) (116) (1,493)
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts 112 265 268
Recognition of Previously Deferred Amounts (76) 149 (1,225)
Qualified defined benefit pension plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost 211 (698) 1,952
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost (2) (5) (146)
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts (204) (133) (1,490)
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts 116 274 283
Retiree medical and life insurance plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost 108 47 (95)
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost 0 (1) (1)
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts 28 25 36
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts (3) (8) (22)
Other plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Actuarial gains and (losses) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost 23 (33) 165
Net prior service credit and (cost) - Incurred but Not Yet Recognized in Net Periodic Benefit Cost 0 1 (2)
Actuarial gains and (losses) - Recognition of Previously Deferred Amounts (12) (8) (39)
Net prior service credit and (cost) - Recognition of Previously Deferred Amounts $ (1) $ (1) $ 7