Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Customer receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 1	$ 1	$ 3
Provision for doubtful accounts	1	2	0
Write off of uncollectible accounts	0	(1)	(2)
Recoveries of prior write-offs	0	0	0
Other	(1)	(1)	0
Balance at end of year	1	1	1
Other receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	15	15	15
Provision for doubtful accounts	3	7	2
Write off of uncollectible accounts	(1)	(2)	(1)
Recoveries of prior write-offs	(1)	(3)	(3)
Other	3	(2)	2
Balance at end of year	$ 19	$ 15	$ 15