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Accounts Receivable, net (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, trade $ 350 $ 299
Credit card receivables 117 49
Vendor receivables for rebates, branding, and other 1 1
Other receivables 24 27
Allowance for doubtful accounts (2) (2)
Accounts receivable, net $ 490 $ 374