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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 1 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Refining Industry [Member] | Dec. 31, 2011 Refining Industry [Member] | Jun. 30, 2012 Financial Services Industry [Member] | Dec. 31, 2011 Financial Services Industry [Member] | Jun. 30, 2012 Interest Rate Swap [Member] | Jun. 30, 2011 Interest Rate Swap [Member] | Jun. 30, 2012 Interest Rate Swap [Member] | Jun. 30, 2011 Interest Rate Swap [Member] | Jul. 31, 2012 Forward Contracts [Member] | Jun. 30, 2012 Forward Contracts [Member] | Jun. 30, 2012 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Fair Value Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Cash Flow Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Cash Flow Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Cash Flow Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Cash Flow Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Cash Flow Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Emission Allowances [Member] Mg | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas In Btus [Member] BBTU | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas In Btus [Member] BBTU | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas In Btus [Member] BBTU | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas In Btus [Member] BBTU | Jun. 30, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Jun. 30, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Jun. 30, 2012 Biofuels Blending [Member] | Jun. 30, 2011 Biofuels Blending [Member] | Jun. 30, 2012 Biofuels Blending [Member] | Jun. 30, 2011 Biofuels Blending [Member] | Jun. 30, 2012 Minimum Inventory [Member] | Jun. 30, 2012 Minimum Inventory [Member] | Jun. 30, 2012 Emissions Allowance [Member] | Jun. 30, 2012 Emissions Allowance [Member]
Volume of outstanding contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount of price risk derivatives |  |  |  |  |  |  |  |  |  |  |  |  | 4,869,000 | 9,052,000 | 4,183,000 | 5,511,000 | 5,511,000 | 18,386,000 | 10,768,000 | 7,618,000 | 30,879,000 | 0 | 28,174,000 | 0 | 55,000 | 58,610,000 | 49,750,000 | 85,000 | 55,000 | 79,986,000 | 91,035,000 | 0 | 3,375,000 | 38,336,000 | 3,610,000 | 19,043,000 | 2,605,000 | 27,930,000 | 0 | 17,917,000 | 12,460,000 | 28,321,000 | 1,580,000 | 101,095,000 | 6,800,000 | 19,360,000 | 18,832,000 | 200,000 | 0 | 102,208,000 | 6,400,000 | 19,360,000 | 17,760,000 | 0 | 0 | 11,900,000 | 0 | 12,271,000 | 0 |  |  |  |  |  |  |  |
Price Risk Management Activities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance program costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59 | $ 39 | $ 126 | $ 95 | $ 1 | $ 3 | $ 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 |  |  |  |  |  |  |  |  |  |  |  | 634 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency commitments maturity date |  |  |  |  |  |  |  |  |  |  | Jul. 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net receivables related to derivative instruments from counterparties |  |  | $ 7 | $ 2 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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