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Pensions and Other Postretirement Benefits Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Change in Assumptions for Pension Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Reduction in Interest and Service Cost $ 192   $ 577  
US Pension Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost including administrative expenses 96 $ 101 287 $ 304
Interest cost 553 689 1,659 2,066
Expected return on plan assets (945) (974) (2,834) (2,922)
Amortization of prior service cost (credit) (1) (1) (3) (3)
Amortization of net actuarial (gains) losses (6) 2 (19) 6
Curtailments, settlements and other     0 0
Net periodic pension and OPEB (income) expense (303) (183) (910) (549)
U.S. Hourly Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Discretionary employer contributions     2,000  
Non-US Pension Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 109 116 283 311
Interest cost 140 184 424 575
Expected return on plan assets (179) (193) (540) (598)
Amortization of prior service cost (credit) 3 3 9 11
Amortization of net actuarial (gains) losses 48 59 143 175
Curtailments, settlements and other     0 108
Net periodic pension and OPEB (income) expense 121 169 319 582
Global OPEB Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 4 6 13 18
Interest cost 50 59 150 178
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (3) (4) (10) (10)
Amortization of net actuarial (gains) losses 5 10 15 27
Curtailments, settlements and other     0 0
Net periodic pension and OPEB (income) expense $ 56 $ 71 $ 168 $ 213