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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transactions [Abstract]          
Revenues from related parties $ 231 $ 284 $ 456 $ 566  
Purchases and related costs from related parties (14) $ 68 100 $ 160  
Trade accounts receivable and other receivables, net from related parties 285   285   $ 144
Trade accounts payable to related parties $ 80   $ 80   $ 121