Employee Benefit Plans - Pension Plan (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
U.S. Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	13	17	26	33
Expected return on plan assets	(9)	(12)	(18)	(22)
Net periodic benefit cost (income)	4	5	8	11
International Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	2	1	3	3
Interest cost	2	5	6	10
Expected return on plan assets	(6)	(7)	(13)	(15)
Net periodic benefit cost (income)	(2)	(1)	(4)	(2)
Plan assets contributions by employer	4		9
Total Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	2	1	3	3
Interest cost	15	22	32	43
Expected return on plan assets	(15)	(19)	(31)	(37)
Net periodic benefit cost (income)	$ 2	$ 4	$ 4	$ 9