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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended		9 Months Ended		1 Months Ended																																																											3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Refining Industry [Member]	Dec. 31, 2011 Refining Industry [Member]	Sep. 30, 2012 Interest Rate Swap [Member]	Sep. 30, 2011 Interest Rate Swap [Member]	Sep. 30, 2012 Interest Rate Swap [Member]	Sep. 30, 2011 Interest Rate Swap [Member]	Oct. 31, 2012 Forward Contracts [Member]	Sep. 30, 2012 Forward Contracts [Member]	Sep. 30, 2012 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Fair Value Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Cash Flow Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Cash Flow Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Cash Flow Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Cash Flow Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Cash Flow Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Emission Allowances (in metric tons) [Member] Mg	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas (In millions of BTUs) [Member] MMBTU	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (In millions of BTUs) [Member] MMBTU	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas (In millions of BTUs) [Member] MMBTU	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (In millions of BTUs) [Member] MMBTU	Sep. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Sep. 30, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Sep. 30, 2012 Biofuels Blending [Member]	Sep. 30, 2011 Biofuels Blending [Member]	Sep. 30, 2012 Biofuels Blending [Member]	Sep. 30, 2011 Biofuels Blending [Member]	Sep. 30, 2012 Minimum Inventory [Member]	Sep. 30, 2011 Minimum Inventory [Member]	Sep. 30, 2012 Minimum Inventory [Member]	Sep. 30, 2011 Minimum Inventory [Member]	Sep. 30, 2012 Emissions Allowance [Member]	Sep. 30, 2012 Emissions Allowance [Member]
Volume of outstanding contracts
Nonmonetary notional amount of price risk derivatives											776	4,691	3,915	6,441	6,441	15,422	5,749	9,673	15,017	55	0	12,364	0	0	56,978	13,395,000	55,000	502	385,000	0	5,000	77,908	25,440,000	0	7,245,000	0	20,000	6	10	0	11,778,000	7,073,000	15,000	19,180	9,705,000	46,540	1,830,000	18,599	11,520,000	46,601	5,045,000	122,349	8,550,000	14,030,000	34,764	200,000	4,250,000	122,928	8,550,000	14,030,000	33,958	200,000	4,250,000	12,115	500	11,260	500
Price Risk Management Activities (Textual)
Compliance program costs																																																																				$ 72	$ 86	$ 198	$ 181	$ 3	$ 1	$ 6	$ 1	$ 0	$ 1
Notional amount of interest rate derivatives	0	0
Interest rate derivatives activity					0	0	0	0
Notional amount of foreign currency derivative purchase contracts										579
Foreign currency commitments maturity date									Oct. 24, 2012
Net receivables related to derivative instruments from counterparties			$ 1	$ 2

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

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