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Related Party Transactions (Details) - Oxy - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Revenues $ 260 $ 204 $ 818 $ 657  
Purchases and related costs (22) $ (68) (184) $ (169)  
Trade accounts receivable and other receivables 1,039   1,039   $ 1,075
Accounts payable $ 976   $ 976   $ 990