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Revenues and Accounts Receivable - Trade Accounts Receivable and Other Receivables (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Trade accounts receivable arising from revenues from contracts with customers $ 2,563 $ 2,277
Other trade accounts receivables and other receivables 3,722 2,732
Impact due to contractual rights of offset with counterparties (3,450) (2,555)
Trade accounts receivable and other receivables, net $ 2,835 $ 2,454
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