Inventories (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Schedule of Inventories
Refinery feedstocks	$ 3,100,000,000	$ 2,135,000,000
Refined products and blendstocks	3,374,000,000	3,231,000,000
Ethanol feedstocks and products	156,000,000	166,000,000
Materials and supplies	230,000,000	226,000,000
Inventories	6,860,000,000	5,758,000,000
Inventories (Textual)
Excess of market value over carrying amount of LIFO inventories	5,800,000,000	6,900,000,000
Amount of non-LIFO inventory	$ 1,200,000,000	$ 851,000,000