Receivables, net (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable, net
Gross customer accounts receivable	$ 501	$ 105
Allowance for doubtful accounts	(13)	(7)
Customer accounts receivable, net	488	98
Receivables from distributors	112	107
Other receivables	28	28
Total receivables, net	$ 628	$ 233