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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Domestic crude oil and refined products $ 3,408 $ 2,099
Foreign subsidiary crude oil (a) [1] 51 310
Materials and supplies 222 149
Oxygenates and by-products 63 81
Merchandise 47 1
Total Inventories $ 3,791 $ 2,640
[1] In April 2017, our pipeline and storage lease in Panama terminated.