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Revenues and Accounts Receivable - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Trade accounts receivable arising from revenues from contracts with customers $ 2,693 $ 2,277
Other trade accounts receivables and other receivables 3,838 2,732
Impact due to contractual rights of offset with counterparties (3,530) (2,555)
Trade accounts receivable and other receivables, net $ 3,001 $ 2,454