Employee Benefit Plans - Pension Plan (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
U.S. Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	12	16	38	49
Expected return on plan assets	(9)	(10)	(27)	(32)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0	0
Net periodic benefit cost (income)	3	6	11	17
International Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	1	1	4	4
Interest cost	4	5	10	15
Expected return on plan assets	(7)	(8)	(20)	(23)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1	1	1	1
Net periodic benefit cost (income)	(1)	(1)	(5)	(3)
Plan assets contributions by employer	6		15
Total Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Net service cost	1	1	4	4
Interest cost	16	21	48	64
Expected return on plan assets	(16)	(18)	(47)	(55)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	1	1	1	1
Net periodic benefit cost (income)	$ 2	$ 5	$ 6	$ 14