Revenues and Accounts Receivable - Trade Accounts Receivable and Other Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Trade accounts receivable arising from revenues from contracts with customers	$ 1,876	$ 3,381
Other trade accounts receivables and other receivables	2,577	3,576
Impact due to contractual rights of offset with counterparties	(2,300)	(3,343)
Trade accounts receivable and other receivables, net	$ 2,153	$ 3,614