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Pensions and OPEB Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plan [Member]      
Change in plan assets      
Employer contributions $ 1,700 $ 1,230 $ 3,076
Other Postretirement Benefits Plan [Member]      
Change in benefit obligations      
Beginning benefit obligation 6,374 6,180  
Service cost 20 19 18
Interest cost 195 202 201
Actuarial (gains) losses (389) 311  
Benefits paid (388) (426)  
Foreign currency translation adjustments (106) 78  
Curtailments, settlements and other 38 10  
Ending benefit obligation 5,744 6,374 6,180
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 369 406  
Benefits paid (388) (426)  
Foreign currency translation adjustments 0 0  
Settlements and other 19 20  
Ending fair value of plan assets 0 0 0
Ending funded status (5,744) (6,374)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (374) (376)  
Non-current liabilities (5,370) (5,998)  
Net amount recorded (5,744) (6,374)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial gain (loss) (752) (1,186)  
Net prior service (cost) credit 34 55  
Total recorded in Accumulated other comprehensive loss (718) (1,131)  
U.S. [Member] | Pension Plan [Member]      
Change in benefit obligations      
Beginning benefit obligation 68,450 68,827  
Service cost 209 203  
Interest cost 2,050 2,145 2,212
Actuarial (gains) losses (4,449) 2,885  
Benefits paid (4,898) (5,067)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements and other (172) (543)  
Ending benefit obligation 61,190 68,450 68,827
Change in plan assets      
Beginning fair value of plan assets 62,639 61,622  
Actual return on plan assets (1,419) 6,549  
Employer contributions 76 77 2,054
Benefits paid (4,898) (5,067)  
Foreign currency translation adjustments 0 0  
Settlements and other (296) (542)  
Ending fair value of plan assets 56,102 62,639 61,622
Ending funded status (5,088) (5,811)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (73) (71)  
Non-current liabilities (5,015) (5,740)  
Net amount recorded (5,088) (5,811)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial gain (loss) (752) 114  
Net prior service (cost) credit 19 23  
Total recorded in Accumulated other comprehensive loss (733) 137  
U.S. [Member] | Other Postretirement Benefits Plan [Member]      
Change in plan assets      
Employer contributions 325 323 335
Non-U.S. [Member] | Pension Plan [Member]      
Change in benefit obligations      
Beginning benefit obligation 22,789 21,156  
Service cost 149 180  
Interest cost 464 473 527
Actuarial (gains) losses (272) 561  
Benefits paid (1,595) (1,369)  
Foreign currency translation adjustments (1,452) 1,953  
Curtailments, settlements and other (179) (165)  
Ending benefit obligation 19,904 22,789 21,156
Change in plan assets      
Beginning fair value of plan assets 14,495 12,799  
Actual return on plan assets 301 1,025  
Employer contributions 1,624 1,153 1,022
Benefits paid (1,595) (1,369)  
Foreign currency translation adjustments (1,106) 1,007  
Settlements and other (191) (120)  
Ending fair value of plan assets 13,528 14,495 $ 12,799
Ending funded status (6,376) (8,294)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 496 67  
Current liabilities (349) (355)  
Non-current liabilities (6,523) (8,006)  
Net amount recorded (6,376) (8,294)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial gain (loss) (3,983) (4,163)  
Net prior service (cost) credit (64) (26)  
Total recorded in Accumulated other comprehensive loss $ (4,047) $ (4,189)