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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Refining Industry [Member] | Dec. 31, 2011 Refining Industry [Member] | Mar. 31, 2012 Financial Services Industry [Member] | Dec. 31, 2011 Financial Services Industry [Member] | Mar. 31, 2012 Interest Rate Swap [Member] | Mar. 31, 2011 Interest Rate Swap [Member] | Mar. 31, 2012 Forward Contracts [Member] | Mar. 31, 2012 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Fair Value Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Cash Flow Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Cash Flow Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Cash Flow Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Cash Flow Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Emission Allowances [Member] Mg | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas In Btus [Member] BBTU | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas In Btus [Member] BBTU | Mar. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member] Mbushel | Mar. 31, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Purchases (Long) [Member] Cash Flow Hedging [Member] Swap [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member] MBbls | Mar. 31, 2012 Biofuels Blending [Member] | Mar. 31, 2011 Biofuels Blending [Member] | Mar. 31, 2012 Minimum Inventory [Member] | Mar. 31, 2012 Emissions Allowance [Member]
Volume of outstanding contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount of price risk derivatives |  |  |  |  |  |  |  |  |  | 10,670,000 | 33,088,000 | 22,418,000 | 5,961,000 | 34,601,000 | 32,112,000 | 2,489,000 | 51,124,000 | 0 | 48,424,000 | 0 | 55,939,000 | 14,670,000 | 55,000 | 0 | 50,000 | 56,511,000 | 40,330,000 | 0 | 2,180,000 | 2,000 | 0 | 16,759,000 | 2,121,000 | 14,799,000 | 8,795,000 | 13,070,000 | 0 | 14,659,000 | 9,085,000 | 13,190,000 | 0 | 72,215,000 | 7,720,000 | 8,050,000 | 0 | 74,651,000 | 650,000 | 7,720,000 | 5,550,000 | 0 | 0 | 2,615,000 | 0 | 2,500,000 | 0 | 5,961,000 |  |  |  |
Price Risk Management Activities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance program costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 67 | $ 56 | $ 2 | $ 1
Notional amount of interest rate derivatives | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives activity |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of foreign currency derivative purchase contracts |  |  |  |  |  |  |  |  | 565 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency commitments maturity date |  |  |  |  |  |  |  |  | April 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net receivables related to derivative instruments from counterparties |  |  | $ 1 | $ 2 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The expense charged against earnings for the periodic recognition of capitalized costs related to purchasing power, fuel, or emission credits. These items may be purchased in one accounting period but are deducted from earnings over time through amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 65 -Paragraph 21 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15C -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15D -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 10 -Subparagraph i -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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 6 -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. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949 + 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 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 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 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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