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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan      
Change in plan assets      
Employer contributions $ 753 $ 403 $ 438
Other Postretirement Benefits Plan      
Change in benefit obligations      
Beginning benefit obligation 4,543 6,124  
Service cost 9 16 18
Interest cost 236 148 123
Amendments 0 0  
Actuarial (gains) losses 204 (1,289)  
Benefits paid (371) (410)  
Foreign currency translation adjustments 32 (69)  
Curtailments, settlements and other 48 23  
Ending benefit obligation 4,701 4,543 6,124
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 348 387  
Benefits paid (371) (410)  
Foreign currency translation adjustments 0 0  
Settlements and other 23 23  
Ending fair value of plan assets 0 0 0
Ending funded status (4,701) (4,543)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (356) (350)  
Non-current liabilities (4,345) (4,193)  
Net amount recorded (4,701) (4,543)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (332) (86)  
Net prior service (cost) credit 8 10  
Total recorded in Accumulated other comprehensive loss (324) (76)  
U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 44,817 60,208  
Service cost 103 161  
Interest cost 2,273 1,292 1,074
Amendments 795 0  
Actuarial (gains) losses 1,185 (12,010)  
Benefits paid (4,186) (4,239)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements and other (506) (595)  
Ending benefit obligation 44,481 44,817 60,208
Change in plan assets      
Beginning fair value of plan assets 44,901 59,921  
Actual return on plan assets 1,829 (10,258)  
Employer contributions 357 71 67
Benefits paid (4,186) (4,239)  
Foreign currency translation adjustments 0 0  
Settlements and other (614) (594)  
Ending fair value of plan assets 42,287 44,901 59,921
Ending funded status (2,194) 84  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 1,557  
Current liabilities (62) (62)  
Non-current liabilities (2,132) (1,411)  
Net amount recorded (2,194) 84  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (3,372) (1,186)  
Net prior service (cost) credit (793) 5  
Total recorded in Accumulated other comprehensive loss (4,165) (1,181)  
U.S. | Other Postretirement Benefits Plan      
Change in plan assets      
Employer contributions 295 335 351
Non-U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 12,582 18,314  
Service cost 161 146  
Interest cost 551 293 236
Amendments 17 0  
Actuarial (gains) losses 453 (3,797)  
Benefits paid (1,001) (955)  
Foreign currency translation adjustments 453 (1,361)  
Curtailments, settlements and other (76) (58)  
Ending benefit obligation 13,140 12,582 18,314
Change in plan assets      
Beginning fair value of plan assets 9,530 13,521  
Actual return on plan assets 640 (2,257)  
Employer contributions 395 332 371
Benefits paid (1,001) (955)  
Foreign currency translation adjustments 354 (1,024)  
Settlements and other (99) (87)  
Ending fair value of plan assets 9,819 9,530 $ 13,521
Ending funded status (3,321) (3,052)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 1,557 1,552  
Current liabilities (330) (316)  
Non-current liabilities (4,548) (4,288)  
Net amount recorded (3,321) (3,052)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (2,560) (2,157)  
Net prior service (cost) credit (74) (56)  
Total recorded in Accumulated other comprehensive loss $ (2,634) $ (2,213)