v3.25.4
Pensions and Other Postretirement Benefits - Pensions and OPEB Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Plan      
Change in plan assets      
Employer contributions $ 201 $ 1,179 $ 753
Other Postretirement Benefits Plan      
Change in benefit obligations      
Beginning benefit obligation 4,337 4,701  
Service cost 9 10  
Interest cost 219 226 236
Amendments 0 0  
Actuarial (gains) losses 91 (179)  
Benefits paid (363) (363)  
Foreign currency translation adjustments 51 (95)  
Curtailments, settlements, and other 26 37  
Ending benefit obligation 4,372 4,337 4,701
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 338 338  
Benefits paid (363) (363)  
Foreign currency translation adjustments 0 0  
Settlements and other 25 25  
Ending fair value of plan assets 0 0 0
Ending funded status (4,372) (4,337)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (346) (347)  
Non-current liabilities (4,025) (3,990)  
Net amount recorded (4,372) (4,337)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (255) (152)  
Net prior service (cost) credit (6) (5)  
Total recorded in Accumulated other comprehensive loss (261) (157)  
U.S.      
Change in plan assets      
Beginning fair value of plan assets 38,298    
Ending fair value of plan assets 38,552 38,298  
U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 40,142 44,481  
Service cost 94 113  
Interest cost 1,995 2,132 2,273
Amendments 0 15  
Actuarial (gains) losses 1,142 (1,600)  
Benefits paid (4,172) (4,140)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements, and other 8 (859)  
Ending benefit obligation 39,209 40,142 44,481
Change in plan assets      
Beginning fair value of plan assets 38,298 42,287  
Actual return on plan assets 4,353 487  
Employer contributions 67 526 357
Benefits paid (4,172) (4,140)  
Foreign currency translation adjustments 0 0  
Settlements and other 6 (862)  
Ending fair value of plan assets 38,552 38,298 42,287
Ending funded status (657) (1,844)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 141 0  
Current liabilities (67) (68)  
Non-current liabilities (731) (1,776)  
Net amount recorded (657) (1,844)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (3,254) (3,953)  
Net prior service (cost) credit (683) (747)  
Total recorded in Accumulated other comprehensive loss (3,937) (4,700)  
U.S. | Other Postretirement Benefits Plan      
Change in plan assets      
Employer contributions 286 285 295
Non-U.S.      
Change in plan assets      
Beginning fair value of plan assets 9,121    
Ending fair value of plan assets 9,113 9,121  
Non-U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 11,604 13,140  
Service cost 168 156  
Interest cost 479 505 551
Amendments 0 51  
Actuarial (gains) losses (101) (350)  
Benefits paid (996) (931)  
Foreign currency translation adjustments 917 (882)  
Curtailments, settlements, and other (29) (85)  
Ending benefit obligation 12,042 11,604 13,140
Change in plan assets      
Beginning fair value of plan assets 9,121 9,819  
Actual return on plan assets 355 288  
Employer contributions 134 653 395
Benefits paid (996) (931)  
Foreign currency translation adjustments 539 (610)  
Settlements and other (40) (98)  
Ending fair value of plan assets 9,113 9,121 $ 9,819
Ending funded status (2,929) (2,483)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 1,647 1,575  
Current liabilities (319) (54)  
Non-current liabilities (4,257) (4,004)  
Net amount recorded (2,929) (2,483)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (2,459) (2,242)  
Net prior service (cost) credit (117) (117)  
Total recorded in Accumulated other comprehensive loss $ (2,576) $ (2,359)