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Pensions and OPEB Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
US Pension Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning benefit obligation $ 71,486 $ 76,724  
Service Cost 220 272  
Interest Cost 2,212 2,754 $ 3,060
Actuarial (gains) losses 416 (2,623)  
Benefits paid (5,507) (5,641)  
Foreign currency translation adjustments 0 0  
Curtailments, settlements, and other 0 0  
Ending benefit obligation 68,827 71,486 76,724
Defined Benefit Plan, Change in Plan Assets [Roll Forward]      
Beginning fair value of plan assets 61,072 65,823  
Actual return on plan assets 4,004 795  
Employer contributions 2,054 95 143
Benefits paid (5,507) (5,641)  
Foreign currency translation adjustments 0 0  
Settlements and other (1) 0  
Ending fair value of plan assets 61,622 61,072 65,823
Ending funded status (7,205) (10,414)  
Amounts recorded in the consolidated balance sheets [Abstract]      
Non-current Assets 0 0  
Current Liabilities (73) (67)  
Non-current Liabilities (7,132) (10,347)  
Net Amounts Recorded (7,205) (10,414)  
Amounts recorded in Accumulated other comprehensive loss [Abstract]      
Net actuarial gain (loss) 55 116  
Net Prior Service (Cost) Credit 27 31  
Total recorded in Accumulated other comprehensive loss 82 147  
Non-US Pension Plans [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning benefit obligation 23,763 27,897  
Service Cost 371 405  
Interest Cost 578 763 1,031
Actuarial (gains) losses 1,508 (256)  
Benefits paid (1,474) (1,332)  
Foreign currency translation adjustments (638) (3,332)  
Curtailments, settlements, and other (58) (382)  
Ending benefit obligation 24,050 23,763 27,897
Defined Benefit Plan, Change in Plan Assets [Roll Forward]      
Beginning fair value of plan assets 12,990 14,669  
Actual return on plan assets 762 997  
Employer contributions 1,033 1,120 770
Benefits paid (1,474) (1,332)  
Foreign currency translation adjustments (232) (2,017)  
Settlements and other (81) (447)  
Ending fair value of plan assets 12,998 12,990 14,669
Ending funded status (11,052) (10,773)  
Amounts recorded in the consolidated balance sheets [Abstract]      
Non-current Assets 91 125  
Current Liabilities (324) (334)  
Non-current Liabilities (10,819) (10,564)  
Net Amounts Recorded (11,052) (10,773)  
Amounts recorded in Accumulated other comprehensive loss [Abstract]      
Net actuarial gain (loss) (4,904) (3,796)  
Net Prior Service (Cost) Credit (21) (33)  
Total recorded in Accumulated other comprehensive loss (4,925) (3,829)  
Other Postretirement Benefit Plan [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning benefit obligation 6,066 6,625  
Service Cost 18 24 23
Interest Cost 201 238 273
Actuarial (gains) losses 230 (209)  
Benefits paid (400) (407)  
Foreign currency translation adjustments 45 (225)  
Curtailments, settlements, and other 20 20  
Ending benefit obligation 6,180 6,066 6,625
Defined Benefit Plan, Change in Plan Assets [Roll Forward]      
Beginning fair value of plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 378 385  
Benefits paid (400) (407)  
Foreign currency translation adjustments 0 0  
Settlements and other 22 22  
Ending fair value of plan assets 0 0 $ 0
Ending funded status (6,180) (6,066)  
Amounts recorded in the consolidated balance sheets [Abstract]      
Non-current Assets 0 0  
Current Liabilities (377) (381)  
Non-current Liabilities (5,803) (5,685)  
Net Amounts Recorded (6,180) (6,066)  
Amounts recorded in Accumulated other comprehensive loss [Abstract]      
Net actuarial gain (loss) (901) (689)  
Net Prior Service (Cost) Credit 54 63  
Total recorded in Accumulated other comprehensive loss $ (847) $ (626)