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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Accounts Receivable, Net    
Advance cash payments received from third parties to mitigate credit risk $ 92 $ 89
Standby letters of credit $ 50 $ 66
Substantially all trade accounts receivable, net, maximum age of balances past their scheduled invoice date 30 days 30 days
Allowance for doubtful accounts receivable $ 3 $ 3