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Pension and Other Postretirement Benefits (Components of Net Periodic Pension and Other Postretirement Benefits Costs) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
U.S. Plans [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost $ 14 $ 14 $ 13
Interest cost 50 63 66
Expected return on plan assets (91) (100) (104)
Amortization of actuarial loss 50 50 41
Amortization of prior service cost (credit) 1 0 0
Net periodic benefit cost (credit) 24 27 16
Non-U.S. Plans [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 21 24 23
Interest cost 101 127 154
Expected return on plan assets (157) (172) (194)
Amortization of actuarial loss 50 55 73
Amortization of prior service cost (credit) (12) (13) (16)
Net periodic benefit cost (credit) 3 21 40
Other Postretirement Benefits [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 0 1 2
Interest cost 6 7 12
Amortization of actuarial loss 5 4 6
Amortization of prior service cost (credit) (41) (37) (34)
Net periodic benefit cost (credit) $ (30) $ (25) $ (14)