Income Taxes - Summary of the Components of Our (Benefit) Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax expense (benefit):
Federal	$ (73)	$ 31	$ 37
State	(3)	5	12
Foreign	(3)	26	17
Current income tax expense (benefit)	(79)	62	66
Deferred income tax expense (benefit):
Federal	13	25	(10)
State	(10)	7	(1)
Foreign	(4)	(26)	5
Deferred income tax expense (benefit):	(1)	6	(6)
(Benefit) provision for income taxes	$ (80)	$ 68	$ 60