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Revenues and Accounts Receivable - Trade Accounts Receivable and Other Receivables (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Trade accounts receivable arising from revenues from contracts with customers $ 1,588 $ 3,381
Other trade accounts receivables and other receivables 1,891 3,576
Impact due to contractual rights of offset with counterparties (1,560) (3,343)
Trade accounts receivable and other receivables, net $ 1,919 $ 3,614