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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Accounts Receivable, Net    
Advance cash payments received from third parties to mitigate credit risk $ 62 $ 88
Standby letters of credit $ 103 $ 36
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 $ 4