Employee Benefit Plans - Pension (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
U.S. Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	$ 0	$ 0	$ 0	$ 0
Defined Benefit Plan, Interest Cost	16	18	46	54
Expected return on plan assets	(10)	(14)	(32)	(43)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Net benefit cost	6	4	14	11
Foreign Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	2	1	6	5
Defined Benefit Plan, Interest Cost	4	4	15	14
Expected return on plan assets	(9)	(9)	(25)	(26)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1	1	1	1
Net benefit cost	(2)	(3)	(3)	(6)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	2	1	6	5
Defined Benefit Plan, Interest Cost	20	22	61	68
Expected return on plan assets	(19)	(23)	(57)	(69)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1	1	1	1
Net benefit cost	$ 4	$ 1	$ 11	$ 5