Price Risk Management Activities, Gain (Loss) by Income Statement Location (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	$ (302)	$ (234)	$ (9)
Cost of Sales [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	(302)	(234)	33
Other Income Expense [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	0	0	(42)
Commodity Contract [Member] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in OCI on derivatives (effective portion)	32	(2)	125
Commodity Contract [Member] | Cost of Sales [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	(23)	(40)	69
Commodity Contract [Member] | Cost of Sales [Member] | Fair Value Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	(6)	45	(75)
Amount of gain or (loss) recognized in income on derivatives (ineffective portion)	(29)	5	(6)
Commodity Contract [Member] | Cost of Sales [Member] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) reclassified from accumulated OCI into income (effective portion)	3	178	337
Amount of gain or (loss) recognized in income on derivatives (ineffective portion)	5	0	3
Commodity Contract [Member] | Cost of Sales [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	(349)	(210)	55
Commodity Contract [Member] | Cost of Sales [Member] | Trading Derivatives [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	23	8	126
Commodity Contract [Member] | Income Loss From Discontinued Operations Net Of Income Taxes [Member] | Cash Flow Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) reclassified from accumulated OCI into income (effective portion)	0	0	(132)
Foreign Currency Contract [Member] | Cost of Sales [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	18	(24)	(22)
Other Contract [Member] | Cost of Sales [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	29	0	0
Alon Earn Out Agreement [Member] | Other Income Expense [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	0	0	20
Alon Earn Out Hedge Commodity Contracts [Member] | Other Income Expense [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	0	0	(62)
Future [Member] | Commodity Contract [Member] | Cost of Sales [Member] | Economic Hedging [Member]
Effect of Derivative Instruments on Statements of Income
Amount of gain or (loss) recognized in income on derivatives	$ (542)