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Pensions and Other Postretirement Benefits Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Global OPEB Plans [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost $ 6 $ 4 $ 10 $ 9
Interest cost 49 50 98 100
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (4) (3) (7) (7)
Amortization of net actuarial (gains) losses 8 5 16 10
Net periodic pension and OPEB (income) expense 59 56 117 112
U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost including administrative expenses 79 96 158 191
Interest cost 536 553 1,072 1,106
Expected return on plan assets (919) (944) (1,838) (1,889)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial (gains) losses (2) (7) (3) (13)
Net periodic pension and OPEB (income) expense (307) (303) (613) (607)
U.S. [Member] | U.S. Hourly Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Discretionary employer contributions       2,000
Non-U.S. [Member] | Pension Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 40 59 86 115
Interest cost 126 126 251 257
Expected return on plan assets (172) (177) (343) (359)
Amortization of prior service cost (credit) 1 3 2 6
Amortization of net actuarial (gains) losses 48 35 95 70
Net periodic pension and OPEB (income) expense $ 43 $ 46 $ 91 $ 89