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Accounts Receivable, Net of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Subtotal $ 430   $ 426
Allowance for doubtful accounts (2)   (2)
Accounts receivable, net of allowance for doubtful accounts 428   424
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Bad debt expense 1 $ 1  
Trade Receivables [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Subtotal 413   408
Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Subtotal $ 17   $ 18