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Pensions and OPEB Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Plan [Member]      
Change in plan assets      
Employer contributions $ 1,230 $ 3,076 $ 1,203
Other Postretirement Benefits Plan [Member]      
Change in benefit obligations      
Beginning benefit obligation 6,180 6,066  
Service cost 19 18 24
Interest cost 202 201 238
Actuarial losses 311 230  
Benefits paid (426) (400)  
Foreign currency translation adjustments 78 45  
Curtailments, settlements and other 10 20  
Ending benefit obligation 6,374 6,180 6,066
Change in plan assets      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 406 378  
Benefits paid (426) (400)  
Foreign currency translation adjustments 0 0  
Settlements and other 20 22  
Ending fair value of plan assets 0 0 0
Ending funded status (6,374) (6,180)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (376) (377)  
Non-current liabilities (5,998) (5,803)  
Net amount recorded (6,374) (6,180)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial gain (loss) (1,186) (901)  
Net prior service (cost) credit 55 54  
Total recorded in Accumulated other comprehensive loss (1,131) (847)  
U.S. [Member] | Pension Plan [Member]      
Change in benefit obligations      
Beginning benefit obligation 68,827 71,486  
Service cost 203 220  
Interest cost 2,145 2,212 2,754
Actuarial losses 2,885 416  
Benefits paid (5,067) (5,507)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements and other (543) 0  
Ending benefit obligation 68,450 68,827 71,486
Change in plan assets      
Beginning fair value of plan assets 61,622 61,072  
Actual return on plan assets 6,549 4,004  
Employer contributions 77 2,054  
Benefits paid (5,067) (5,507)  
Foreign currency translation adjustments 0 0  
Settlements and other (542) (1)  
Ending fair value of plan assets 62,639 61,622 61,072
Ending funded status (5,811) (7,205)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 0 0  
Current liabilities (71) (73)  
Non-current liabilities (5,740) (7,132)  
Net amount recorded (5,811) (7,205)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial gain (loss) 114 55  
Net prior service (cost) credit 23 27  
Total recorded in Accumulated other comprehensive loss 137 82  
U.S. [Member] | Other Postretirement Benefits Plan [Member]      
Change in plan assets      
Employer contributions 323 335 340
Non-U.S. [Member] | Pension Plan [Member]      
Change in benefit obligations      
Beginning benefit obligation 21,156 21,008  
Service cost 180 255  
Interest cost 473 527 689
Actuarial losses 561 1,328  
Benefits paid (1,369) (1,458)  
Foreign currency translation adjustments 1,953 (445)  
Curtailments, settlements and other (165) (59)  
Ending benefit obligation 22,789 21,156 21,008
Change in plan assets      
Beginning fair value of plan assets 12,799 12,794  
Actual return on plan assets 1,025 750  
Employer contributions 1,153 1,022 1,108
Benefits paid (1,369) (1,458)  
Foreign currency translation adjustments 1,007 (229)  
Settlements and other (120) (80)  
Ending fair value of plan assets 14,495 12,799 $ 12,794
Ending funded status (8,294) (8,357)  
Amounts recorded in the consolidated balance sheets      
Non-current assets 67 91  
Current liabilities (355) (316)  
Non-current liabilities (8,006) (8,132)  
Net amount recorded (8,294) (8,357)  
Amounts recorded in Accumulated other comprehensive loss      
Net actuarial gain (loss) (4,163) (3,852)  
Net prior service (cost) credit (26) (30)  
Total recorded in Accumulated other comprehensive loss $ (4,189) $ (3,882)