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Revenues and Accounts Receivable - Trade Accounts Receivable and Other Receivables (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Trade accounts receivable arising from revenues from contracts with customers $ 3,140 $ 2,317
Other trade accounts receivables and other receivables 3,582 2,818
Impact due to contractual rights of offset with counterparties (3,321) (2,582)
Trade accounts receivable and other receivables, net $ 3,401 $ 2,553