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Accounts Receivable, net (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (2) $ (3)
Accounts receivable, net 541 539
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 285 361
Credit Card Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 160 133
Vendor receivables for rebates, branding and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 29 21
Other Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current $ 69 $ 27