Employee Benefit Plans - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in benefit obligation:
Benefit obligation at beginning of year	$ 154	$ 125
Service cost	3	2	$ 3
Interest cost	4	4	4
Participant contributions	1	1
Actuarial loss	(17)	(21)
Benefits paid	(4)	(3)
Other, principally foreign exchange	(5)	(4)
Benefit obligation at end of year		154	125
Change in plan assets:
Fair value of plan assets at beginning of year	129	107
Actual gain on plan assets	16	18
Employer contributions	4	4
Participant contributions	1	1
Benefits paid	(5)	(3)
Other, principally foreign exchange	(3)	(2)
Fair value of assets at end of year	148	129	$ 107
Amounts recognized in the consolidated balance sheets:
Funded status (current)	0	0
Funded status (non-current)	(32)	(25)
Accumulated other comprehensive loss:
Unrecognized actuarial loss	40	34
Unrecognized prior service cost	(2)	0
Deferred taxes	0	(1)
Net amount recognized	6	8
Defined Benefit Plan, Accumulated Benefit Obligation	$ 180	$ 154