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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Related Party Transactions [Abstract]          
Revenues from related parties $ 10 $ 10 $ 17 $ 33  
Purchases and related costs from related parties 95 $ 94 185 $ 223  
Trade accounts receivable and other receivables, net from related parties 29   29   $ 34
Trade accounts payable to related parties $ 80   $ 80   $ 88