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Related Party Transactions - Schedule of Related Parties (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions [Abstract]      
Revenues from related parties $ 46 $ 692 $ 1,067
Purchases and related costs from related parties 451 223 $ 410
Trade accounts receivable and other receivables, net from related parties 34 134  
Trade accounts payable to related parties $ 88 $ 102