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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Related Party Transactions [Abstract]          
Revenues from related parties $ 205 $ 266 $ 661 $ 832  
Purchases and related costs from related parties (7) $ 157 93 $ 317  
Trade accounts receivable and other receivables, net from related parties 165   165   $ 144
Trade accounts payable to related parties $ 105   $ 105   $ 121