Employee Benefit Plans - Pension Plan (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
U.S. Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	$ 0	$ 0
Interest cost	13	16
Expected return on plan assets	(9)	(10)
Net periodic benefit cost (income)	4	6
International Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	1	2
Interest cost	4	5
Expected return on plan assets	(7)	(8)
Net periodic benefit cost (income)	(2)	(1)
Total Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	1	2
Interest cost	17	21
Expected return on plan assets	(16)	(18)
Net periodic benefit cost (income)	$ 2	$ 5