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Accounts Receivable, net ((Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for doubtful accounts $ (2) $ (2)
Accounts receivable, net 451 541
Trade Accounts Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 289 285
Credit Card Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 104 160
Vendor receivables for rebates, branding and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current 18 29
Other Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, gross, current $ 42 $ 69