Employee Benefit Plans - Pension (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	$ 2	$ 2
Interest cost	23	30
Expected return on plan assets	(23)	(27)
Net benefit cost	2	5
U.S. Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0
Interest cost	18	23
Expected return on plan assets	(14)	(18)
Net benefit cost	4	5
International Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	2	2
Interest cost	5	7
Expected return on plan assets	(9)	(9)
Net benefit cost	$ (2)	$ 0