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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Schedule of Inventories    
Refinery feedstocks $ 2,399 $ 2,265
Refined petroleum products and blendstocks 4,034 3,653
Ethanol feedstocks and products 260 298
Renewable diesel feedstocks and products 46 52
Materials and supplies 274 264
Inventories 7,013 6,532
Inventories (Textual)    
Excess of market value over carrying amount of LIFO inventories 2,500 1,500
Inventory not valued at LIFO $ 1,400 $ 1,100