Pension Benefit Plans and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations Recognized in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
U.S. Pension Plans
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	$ (2)	$ 66
Amortization of actuarial loss	(57)	(67)
Loss due to settlement	(176)	(98)
Total	(235)	(99)
Changes in benefit obligations were recognized in accumulated other comprehensive income	(235)	(99)
Non-U.S. Pension Plans
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	(40)	87
Amortization of actuarial loss	(16)	(12)
Loss due to settlement	(42)
Total	(98)	75
Translation	30	(43)
Changes in benefit obligations were recognized in accumulated other comprehensive income	(68)	32
U.S Postretirement Benefit Plans
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss		(1)
Amortization of actuarial loss	(2)	(2)
Amortization of prior service credit	8	8
Total	6	5
Non-U.S. Postretirement Benefit Plans
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	1	9
Total	$ 1	$ 9