Leases - Schedule of Rent Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	[1]	Dec. 31, 2019	[1]	Dec. 31, 2018
Schedule Of Rent Expense [Abstract]
Minimum rentals	$ 19		$ 19		$ 21
Contingent rentals	1		2		3
Rent expense	$ 20		$ 21		$ 24

[1] These amounts include $3 million and $5 million of short term and variable rent for the years ended December 31, 2020 and 2019, respectively