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Pensions And Other Postretirement Benefits - Pensions and OPEB Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Plan      
Change in plan assets      
Employer contributions $ 1,179 $ 753 $ 403
Other Postretirement Benefits Plan      
Change in benefit obligations      
Beginning benefit obligation 4,701 4,543  
Service cost 10 9 16
Interest cost 226 236 148
Amendments 0 0  
Actuarial (gains) losses (179) 204  
Benefits paid (363) (371)  
Foreign currency translation adjustments (95) 32  
Curtailments, settlements and other 37 48  
Ending benefit obligation 4,337 4,701 4,543
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 338 348  
Benefits paid (363) (371)  
Foreign currency translation adjustments 0 0  
Settlements and other 25 23  
Ending fair value of plan assets 0 0 0
Ending funded status (4,337) (4,701)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (347) (356)  
Non-current liabilities (3,990) (4,345)  
Net amount recorded (4,337) (4,701)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (152) (332)  
Net prior service (cost) credit (5) 8  
Total recorded in Accumulated other comprehensive loss (157) (324)  
U.S.      
Change in plan assets      
Beginning fair value of plan assets 42,287    
Ending fair value of plan assets 38,298 42,287  
U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 44,481 44,817  
Service cost 113 103  
Interest cost 2,132 2,273 1,292
Amendments 15 795  
Actuarial (gains) losses (1,600) 1,185  
Benefits paid (4,140) (4,186)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements and other (859) (506)  
Ending benefit obligation 40,142 44,481 44,817
Change in plan assets      
Beginning fair value of plan assets 42,287 44,901  
Actual return on plan assets 487 1,829  
Employer contributions 526 357 71
Benefits paid (4,140) (4,186)  
Foreign currency translation adjustments 0 0  
Settlements and other (862) (614)  
Ending fair value of plan assets 38,298 42,287 44,901
Ending funded status (1,844) (2,194)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (68) (62)  
Non-current liabilities (1,776) (2,132)  
Net amount recorded (1,844) (2,194)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (3,953) (3,372)  
Net prior service (cost) credit (747) (793)  
Total recorded in Accumulated other comprehensive loss (4,700) (4,165)  
U.S. | Other Postretirement Benefits Plan      
Change in plan assets      
Employer contributions 285 295 335
Non-U.S.      
Change in plan assets      
Beginning fair value of plan assets 9,819    
Ending fair value of plan assets 9,121 9,819  
Non-U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 13,140 12,582  
Service cost 156 161  
Interest cost 505 551 293
Amendments 51 17  
Actuarial (gains) losses (350) 453  
Benefits paid (931) (1,001)  
Foreign currency translation adjustments (882) 453  
Curtailments, settlements and other (85) (76)  
Ending benefit obligation 11,604 13,140 12,582
Change in plan assets      
Beginning fair value of plan assets 9,819 9,530  
Actual return on plan assets 288 640  
Employer contributions 653 395 332
Benefits paid (931) (1,001)  
Foreign currency translation adjustments (610) 354  
Settlements and other (98) (99)  
Ending fair value of plan assets 9,121 9,819 $ 9,530
Ending funded status (2,483) (3,321)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 1,575 1,557  
Current liabilities (54) (330)  
Non-current liabilities (4,004) (4,548)  
Net amount recorded (2,483) (3,321)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (2,242) (2,560)  
Net prior service (cost) credit (117) (74)  
Total recorded in Accumulated other comprehensive loss $ (2,359) $ (2,634)