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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended																																																														3 Months Ended					1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Interest Rate Swap [Member]	Mar. 31, 2012 Interest Rate Swap [Member]	Mar. 31, 2013 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Fair Value Hedging [Member] Physical Purchase Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Cash Flow Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Cash Flow Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Cash Flow Hedging [Member] Physical Purchase Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Emission Allowances (in metric tons) [Member] Mg	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Emission Allowances (in metric tons) [Member] Mg	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Economic Hedging [Member] Physical Purchase Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Economic Hedging [Member] Physical Purchase Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu	Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls	Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU	Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] RINs (in thousands of gallons) [Member] gal	Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] RINs (in thousands of gallons) [Member] gal	Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] RINs (in thousands of gallons) [Member] gal	Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Sales (Short) [Member] Maturity Year Two [Member] RINs (in thousands of gallons) [Member] gal	Mar. 31, 2013 Biofuels Blending [Member]	Mar. 31, 2012 Biofuels Blending [Member]	Mar. 31, 2012 Minimum Inventory [Member]	Mar. 31, 2013 Emissions Allowance [Member]	Mar. 31, 2012 Emissions Allowance [Member]	Apr. 30, 2013 Foreign Currency Contract [Member]	Mar. 31, 2013 Foreign Currency Contract [Member]
Volume of outstanding contracts
Nonmonetary notional amount of price risk derivatives					369	3,256	2,887	1,829	347	1,482	2,267	0	1,550	0	50,113	19,320,000	0	0	17	5,000	69,216	39,620,000	0	420,000	2	12,250,000	0	0	3,000,000	0	17,358,000	447,000	43,972	1,125,000	16,915	0	43,972	500,000	16,915	0	106,227	3,500,000	2,555,000	22,518	0	0	105,432	1,500,000	2,555,000	22,793	0	0	18,660	1,250,000	0	0	17,310	250,000	0	0	15,600,000	0	33,038,000	0
Price Risk Management Activities (Textual)
Compliance program costs																																																																	$ 130	$ 67	$ 2	$ 0	$ 1
Notional amount of interest rate derivatives	0	0
Interest rate derivatives activity			0	0
Notional amount of foreign currency derivative purchase contracts																																																																							$ 576
Foreign currency commitments maturity date																																																																						Apr. 30, 2013

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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