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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
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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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- 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) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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