Income Taxes - Summary of the Components of Our Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense:
Federal	$ 31	$ 37	$ 93
State	5	12	1
Foreign	26	17	6
Current income tax expense	62	66	100
Deferred income tax expense (benefit):
Federal	25	(10)	25
State	7	(1)	2
Foreign	(26)	5	2
Deferred income tax expense (benefit):	6	(6)	29
Provision for income taxes	$ 68	$ 60	$ 129	[1]

[1] The year ended December 31, 2017 reflects $67 million of Transition Tax and $6 million of tax expense recorded due to the remeasurement of net deferred tax assets related to the 2017 Tax Act enacted on December 22, 2017. Refer to “Note 11: Income Taxes” for further information.