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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended |  | 3 Months Ended | 6 Months Ended |
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Jul. 31, 2013 Foreign Currency Contract [Member] | Jun. 30, 2013 Foreign Currency Contract [Member] | Jun. 30, 2013 Biofuels Blending [Member] | Jun. 30, 2012 Biofuels Blending [Member] | Jun. 30, 2013 Biofuels Blending [Member] | Jun. 30, 2012 Biofuels Blending [Member] | Jun. 30, 2013 Fair Value Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Fair Value Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Fair Value Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Cash Flow Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Cash Flow Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Cash Flow Hedging [Member] Forward Contracts [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Soybean Oil (in thousands of pounds) [Member] lb | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Soybean Oil (in thousands of pounds) [Member] lb | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Soybean Oil (in thousands of pounds) [Member] lb | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Economic Hedging [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Soybean Oil (in thousands of pounds) [Member] lb | Jun. 30, 2013 Economic Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Economic Hedging [Member] Forward Contracts [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Economic Hedging [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Economic Hedging [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Commodity [Member] Future [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Commodity [Member] Future [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Forward Contracts [Member] Short (Sales) [Member] Maturity Current Year [Member] RINs (in thousands of gallons) [Member] gal | Jun. 30, 2013 Commodity [Member] Forward Contracts [Member] Short (Sales) [Member] Maturity Year Two [Member] RINs (in thousands of gallons) [Member] gal | Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Swap [Member] Long (Purchases) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Swap [Member] Short (Sales) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Options Held [Member] Long (Purchases) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Jun. 30, 2013 Commodity [Member] Options Held [Member] Short (Sales) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Jun. 30, 2013 Commodity [Member] Options Held [Member] Short (Sales) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls
Volume of Outstanding Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount of price risk derivatives |  |  |  |  |  |  | 8,062 | 10,954 | 2,892 | 7,938 | 5,527 | 2,411 | 39,316 | 28,405,000 | 5,220,000 | 58 | 5,000 | 0 | 53,514 | 49,030,000 | 27,900,000 | 0 | 1,180,000 | 0 | 21,678,000 | 1,215,000 | 3,510 | 0 | 2,585 | 0 | 10,750,000 | 0 | 99,886 | 1,700,000 | 5,620,000 | 37,527 | 0 | 0 | 99,311 | 750,000 | 5,620,000 | 37,927 | 0 | 0 | 25,000,000 | 0 | 26,255 | 145,000 | 21,135 | 0 | 26,255 | 145,000 | 21,135 | 0 | 26,321 | 1,700,000 | 0 | 0 | 25,256 | 0
Monetary notional amount of derivative liabilities |  | $ 581 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price Risk Management Activities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency commitments maturity date | Jul. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance program costs |  |  | $ 137 | $ 59 | $ 267 | $ 126 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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