Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Customer receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 4	$ 8	$ 13
Provision for doubtful accounts	3	2	1
Write off of uncollectible accounts	(2)	(2)	(5)
Recoveries of prior write-offs	0	0	0
Other	(2)	(4)	(1)
Balance at end of year	3	4	8
Other receivables
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	31	34	32
Provision for doubtful accounts	13	7	9
Write off of uncollectible accounts	(2)	(2)	(1)
Recoveries of prior write-offs	(5)	(3)	(3)
Other	(4)	(5)	(3)
Balance at end of year	$ 33	$ 31	$ 34