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Accounts Receivable, Net (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Accounts Receivable, Net    
Advance cash payments received from third parties to mitigate credit risk $ 164 $ 117
Standby letters of credit $ 42 $ 54
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