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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended			1 Months Ended		12 Months Ended																																																								12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Interest Rate Swap [Member]	Dec. 31, 2011 Interest Rate Swap [Member]	Dec. 31, 2010 Interest Rate Swap [Member]	Jan. 31, 2013 Forward Contracts [Member]	Dec. 31, 2012 Forward Contracts [Member]	Dec. 31, 2012 Biofuels Blending [Member]	Dec. 31, 2011 Biofuels Blending [Member]	Dec. 31, 2010 Biofuels Blending [Member]	Dec. 31, 2012 Minimum Inventory [Member]	Dec. 31, 2011 Minimum Inventory [Member]	Dec. 31, 2012 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Fair Value Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Cash Flow Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Cash Flow Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Cash Flow Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Cash Flow Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Cash Flow Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Emission Allowances (In metric tons) [Member] Mg	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (In millions of btus) [Member] MMBTU	Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Natural Gas (In millions of btus) [Member] MMBTU	Dec. 31, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (In millions of btus) [Member] MMBTU	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Natural Gas (In millions of btus) [Member] MMBTU	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (In millions of btus) [Member] MMBTU	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Natural Gas (In millions of btus) [Member] MMBTU	Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu	Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls	Dec. 31, 2012 Cost of Sales [Member] Economic Hedging [Member]	Dec. 31, 2011 Cost of Sales [Member] Economic Hedging [Member]	Dec. 31, 2010 Cost of Sales [Member] Economic Hedging [Member]	Dec. 31, 2012 Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member]	Dec. 31, 2011 Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member]	Dec. 31, 2010 Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member]	Dec. 31, 2012 Subsequent Event [Member] Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives													1,052	4,857	3,805	1,300	1,300	11,894	2,981	8,913	1,687	0	895	0	68,000	48,109	13,995,000	0	5,000	63,769	28,680,000	0	25,000	10	16,750,000	0	0	16,378,000	29,000	61,002	3,135,000	9,000	0	60,819	5,045,000	9,000	0	69,939	1,450,000	4,830,000	2,236	0	0	69,923	400,000	4,830,000	2,236	0	0	2,750	0	3,400	0
Price Risk Management Activities (Textual)
Compliance program costs								$ 250	$ 231	$ 66	$ 8	$ 4
Notional amount of interest rate derivatives	0	0
Interest rate derivatives activity			0	0	0
Notional amount of foreign currency derivative purchase contracts							552
Foreign currency commitments maturity date						Jan. 31, 2013
Gain on foreign currency commitments open at period end to be recognized in subsequent quarter																																																																$ (37)	$ (302)	$ (234)	$ (38)	$ 18	$ (24)	$ 1

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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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