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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Plan      
Change in plan assets      
Employer contributions $ 615 $ 1,700 $ 1,230
Other Postretirement Benefits Plan      
Change in benefit obligations      
Beginning benefit obligation 5,744 6,374  
Service cost 17 20 19
Interest cost 220 195 202
Actuarial (gains) losses 641 (389)  
Benefits paid (395) (388)  
Foreign currency translation adjustments 54 (106)  
Curtailments, settlements and other 23 38  
Ending benefit obligation 6,304 5,744 6,374
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 370 369  
Benefits paid (395) (388)  
Foreign currency translation adjustments 0 0  
Settlements and other 25 19  
Ending fair value of plan assets 0 0 0
Ending funded status (6,304) (5,744)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (369) (374)  
Non-current liabilities (5,935) (5,370)  
Net amount recorded (6,304) (5,744)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (1,364) (752)  
Net prior service (cost) credit 27 34  
Total recorded in Accumulated other comprehensive loss (1,337) (718)  
U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 61,190 68,450  
Service cost 179 209  
Interest cost 2,264 2,050 2,145
Actuarial (gains) losses 6,444 (4,449)  
Benefits paid (4,753) (4,898)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements and other (640) (172)  
Ending benefit obligation 64,684 61,190 68,450
Change in plan assets      
Beginning fair value of plan assets 56,102 62,639  
Actual return on plan assets 8,454 (1,419)  
Employer contributions 83 76 77
Benefits paid (4,753) (4,898)  
Foreign currency translation adjustments 0 0  
Settlements and other (647) (296)  
Ending fair value of plan assets 59,239 56,102 62,639
Ending funded status (5,445) (5,088)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (68) (73)  
Non-current liabilities (5,377) (5,015)  
Net amount recorded (5,445) (5,088)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (1,980) (752)  
Net prior service (cost) credit 14 19  
Total recorded in Accumulated other comprehensive loss (1,966) (733)  
U.S. | Other Postretirement Benefits Plan      
Change in plan assets      
Employer contributions 326 325 323
Non-U.S. | Pension Plan      
Change in benefit obligations      
Beginning benefit obligation 19,904 22,789  
Service cost 120 149  
Interest cost 456 464 473
Actuarial (gains) losses 1,653 (272)  
Benefits paid (1,234) (1,595)  
Foreign currency translation adjustments 561 (1,452)  
Curtailments, settlements and other (62) (179)  
Ending benefit obligation 21,398 19,904 22,789
Change in plan assets      
Beginning fair value of plan assets 13,528 14,495  
Actual return on plan assets 1,669 301  
Employer contributions 532 1,624 1,153
Benefits paid (1,234) (1,595)  
Foreign currency translation adjustments 668 (1,106)  
Settlements and other (202) (191)  
Ending fair value of plan assets 14,961 13,528 $ 14,495
Ending funded status (6,437) (6,376)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 698 496  
Current liabilities (342) (349)  
Non-current liabilities (6,793) (6,523)  
Net amount recorded (6,437) (6,376)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial loss (4,688) (3,983)  
Net prior service (cost) credit (78) (64)  
Total recorded in Accumulated other comprehensive loss $ (4,766) $ (4,047)