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Accounts and Notes Receivable, Net (Schedule of Accounts and Notes Receivable) (Parenthetical) (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Accounts Notes And Loans Receivable [Line Items]    
Accounts receivable - trade, net $ 1,016 $ 847
Allowance for doubtful accounts receivable 6 5
Trade Notes Receivable [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Accounts receivable - trade, net $ 3 $ 1