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Postretirement Benefit Plans - Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in plan assets      
Beginning balance at fair value $ 24,515    
Settlements   $ (414)  
Ending balance at fair value 24,092 24,515  
Increased (decrease) in benefit obligation   765  
Settlement payments   414  
Qualified Defined  Benefit Pension Plans      
Change in benefit obligation      
Beginning balance 28,959 28,698  
Service cost 60 65 $ 87
Interest cost 1,398 1,459 1,289
Actuarial losses (gains) (1,556) 731  
Settlements 0 (414)  
Plan amendments 2 6  
Benefits paid (1,664) (1,586)  
Medicare Part D subsidy 0 0  
Participants’ contributions 0 0  
Ending balance 27,199 28,959 28,698
Change in plan assets      
Beginning balance at fair value 22,800 23,228  
Actual return on plan assets 288 1,572  
Settlements 0 (414)  
Benefits paid (1,664) (1,586)  
Company contributions 990 0  
Medicare Part D subsidy 0 0  
Participants’ contributions 0 0  
Ending balance at fair value 22,414 22,800 $ 23,228
Net (unfunded) funded status of the plans $ (4,785) $ (6,159)  
Weighted average discount rate 5.625% 5.00% 5.25%
Increased (decrease) in benefit obligation $ (1,800)    
Net losses due to changes in demographic data and assumptions 250    
Settlement payments $ 0 $ 414  
Actual return on plan assets (percent) 1.00%    
Retiree Medical and Life Insurance Plans      
Change in benefit obligation      
Beginning balance $ 1,328 1,359  
Service cost 5 5 $ 9
Interest cost 63 68 49
Actuarial losses (gains) (158) 27  
Settlements 0 0  
Plan amendments 0 1  
Benefits paid (178) (192)  
Medicare Part D subsidy 2 1  
Participants’ contributions 52 59  
Ending balance 1,114 1,328 1,359
Change in plan assets      
Beginning balance at fair value 1,715 1,656  
Actual return on plan assets 86 190  
Settlements 0 0  
Benefits paid (178) (192)  
Company contributions 1 1  
Medicare Part D subsidy 2 1  
Participants’ contributions 52 59  
Ending balance at fair value 1,678 1,715 $ 1,656
Net (unfunded) funded status of the plans $ 564 $ 387  
Weighted average discount rate 5.50% 5.00% 5.25%
Settlement payments $ 0 $ 0  
Actual return on plan assets (percent) 1.00% 7.00%  
Long-term rate of return assumption (percent)   6.50%