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Receivables, net (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts receivable, net    
Gross customer accounts receivable $ 465 $ 105
Allowance for doubtful accounts (20) (7)
Customer accounts receivable, net 445 98
Receivables from distributors 121 107
Other receivables 26 28
Total receivables, net $ 592 $ 233