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Pensions and Other Postretirement Benefits Schedule of Net Benefit Costs (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended
Apr. 30, 2016
Mar. 31, 2017
Mar. 31, 2016
US Pension Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service cost including administrative expenses   $ 79 $ 95
Interest cost   536 553
Expected return on plan assets   (919) (945)
Amortization of prior service cost (credit)   (1) (1)
Amortization of net actuarial (gains) losses   (1) (6)
Net periodic pension and OPEB (income) expense   (306) (304)
U.S. Hourly Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Discretionary employer contributions $ 482   1,500
Non-US Pension Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service cost   95 85
Interest cost   127 144
Expected return on plan assets   (183) (182)
Amortization of prior service cost (credit)   1 3
Amortization of net actuarial (gains) losses   62 47
Net periodic pension and OPEB (income) expense   102 97
Global OPEB Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Service cost   4 5
Interest cost   49 50
Expected return on plan assets   0 0
Amortization of prior service cost (credit)   (3) (4)
Amortization of net actuarial (gains) losses   8 5
Net periodic pension and OPEB (income) expense   $ 58 $ 56