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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plan      
Change in plan assets      
Employer contributions $ 464 $ 615 $ 1,700
Other Postretirement Benefits Plan      
Change in benefit obligations      
Beginning benefit obligation 6,304 5,744  
Service cost 19 17 20
Interest cost 173 220 195
Actuarial losses 551 641  
Benefits paid (408) (395)  
Foreign currency translation adjustments (3) 54  
Curtailments, settlements and other 20 23  
Ending benefit obligation 6,656 6,304 5,744
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 387 370  
Benefits paid (408) (395)  
Foreign currency translation adjustments 0 0  
Settlements and other 21 25  
Ending fair value of plan assets 0 0 0
Ending funded status (6,656) (6,304)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (379) (369)  
Non-current liabilities (6,277) (5,935)  
Net amount recorded (6,656) (6,304)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (1,823) (1,364)  
Net prior service (cost) credit 20 27  
Total recorded in Accumulated other comprehensive loss (1,803) (1,337)  
U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 64,684 61,190  
Service cost 177 179  
Interest cost 1,716 2,264 2,050
Actuarial losses 4,757 6,444  
Benefits paid (4,600) (4,753)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements and other (266) (640)  
Ending benefit obligation 66,468 64,684 61,190
Change in plan assets      
Beginning fair value of plan assets 59,239 56,102  
Actual return on plan assets 6,635 8,454  
Employer contributions 68 83 76
Benefits paid (4,600) (4,753)  
Foreign currency translation adjustments 0 0  
Settlements and other (265) (647)  
Ending fair value of plan assets 61,077 59,239 56,102
Ending funded status (5,391) (5,445)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (66) (68)  
Non-current liabilities (5,325) (5,377)  
Net amount recorded (5,391) (5,445)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (3,256) (1,980)  
Net prior service (cost) credit 11 14  
Total recorded in Accumulated other comprehensive loss (3,245) (1,966)  
U.S. | Other Postretirement Benefits Plan      
Change in plan assets      
Employer contributions 343 326 325
Non-U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 21,398 19,904  
Service cost 133 120  
Interest cost 362 456 464
Actuarial losses 1,506 1,653  
Benefits paid (1,132) (1,234)  
Foreign currency translation adjustments 870 561  
Curtailments, settlements and other (2,330) (62)  
Ending benefit obligation 20,807 21,398 19,904
Change in plan assets      
Beginning fair value of plan assets 14,961 13,528  
Actual return on plan assets 1,573 1,669  
Employer contributions 396 532 1,624
Benefits paid (1,132) (1,234)  
Foreign currency translation adjustments 389 668  
Settlements and other (2,341) (202)  
Ending fair value of plan assets 13,846 14,961 $ 13,528
Ending funded status (6,961) (6,437)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 980 698  
Current liabilities (364) (342)  
Non-current liabilities (7,577) (6,793)  
Net amount recorded (6,961) (6,437)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (5,123) (4,688)  
Net prior service (cost) credit (60) (78)  
Total recorded in Accumulated other comprehensive loss $ (5,183) $ (4,766)