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Inventories (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Inventories
Refinery feedstocks			$ 2,427	$ 2,068
Refined petroleum products and blendstocks			3,459	3,153
Ethanol feedstocks and products			242	238
Materials and supplies			256	250
Inventories			6,384	5,709
Inventories (Textual)
Excess of market value over carrying amount of LIFO inventories			3,000	1,900
Inventory not valued at LIFO			1,000	641
Lower of cost or market inventory valuation adjustment (benefit)	$ (454)	$ (293)	$ 0	(747)	$ 790
Effect of LIFO inventory liquidation on income				$ 120

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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 effect of liquidating LIFO (last in first out) inventory layers on income.

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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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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

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

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