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Accounts Receivable, net (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade $ 400 $ 299
Credit card receivables 133 49
Other receivables 42 28
Allowance for doubtful accounts (2) (2)
Accounts receivable, net $ 573 $ 374