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, 2018	Dec. 31, 2017
U.S. | Pension Benefit Plans
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	$ 86	$ (2)
Amortization of prior service credit	(51)	(57)
Loss due to settlement	(61)	(176)
Other adjustments	(1)
Total	(27)	(235)
Changes in benefit obligations were recognized in accumulated other comprehensive income	(27)	(235)
U.S. | Other Postretirement Benefits
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	(8)
Amortization of actuarial loss	(2)	(2)
Amortization of prior service credit	7	8
Total	(3)	6
Non-U.S. | Pension Benefit Plans
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	43	(40)
Amortization of prior service credit	(11)	(16)
Loss due to settlement	(13)	(42)
Other adjustments	6
Total	25	(98)
Translation	(18)	30
Changes in benefit obligations were recognized in accumulated other comprehensive income	7	(68)
Non-U.S. | Other Postretirement Benefits
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	(4)	1
Total	$ (4)	$ 1