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Inventories (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Schedule of Inventories
Refinery feedstocks	$ 3,109,000,000	$ 2,458,000,000
Refined products and blendstocks	3,582,000,000	2,995,000,000
Ethanol feedstocks and products	148,000,000	191,000,000
Convenience store merchandise	0	112,000,000
Materials and supplies	224,000,000	217,000,000
Inventories	7,063,000,000	5,973,000,000
Inventories (Textual)
Excess of market value over carrying amount of LIFO inventories	$ 7,100,000,000	$ 6,700,000,000

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- Definition

The aggregate carrying amount as of the balance sheet date of unrefined petroleum and the liquid hydrocarbon components recovered from natural gas.

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The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

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Carrying amount as of the balance sheet date of finished goods inventories for petroleum products, crude oil, petrochemical products, and other oil and gas inventories.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Carrying amount as of the balance sheet date of merchandise inventory purchased by a retailer, wholesaler or distributor and held for future sale.

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Carrying amount as of the balance sheet date of ethanol feedstocks and products.

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