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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended |  |  |  | 3 Months Ended | 1 Months Ended |
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Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Interest Rate Swap [Member] | Mar. 31, 2012 Interest Rate Swap [Member] | Mar. 31, 2013 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Fair Value Hedging [Member] Physical Purchase Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Cash Flow Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Cash Flow Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Cash Flow Hedging [Member] Physical Purchase Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Emission Allowances (in metric tons) [Member] Mg | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Emission Allowances (in metric tons) [Member] Mg | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Economic Hedging [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Economic Hedging [Member] Physical Purchase Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Economic Hedging [Member] Physical Purchase Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (in bushels) [Member] bu | Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (in thousands of barrels) [Member] MBbls | Mar. 31, 2013 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (in millions of BTUs) [Member] MMBTU | Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] RINs (in thousands of gallons) [Member] gal | Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] RINs (in thousands of gallons) [Member] gal | Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] RINs (in thousands of gallons) [Member] gal | Mar. 31, 2013 Commodity [Member] RINs Fixed-Price Contracts [Member] Sales (Short) [Member] Maturity Year Two [Member] RINs (in thousands of gallons) [Member] gal | Mar. 31, 2013 Biofuels Blending [Member] | Mar. 31, 2012 Biofuels Blending [Member] | Mar. 31, 2012 Minimum Inventory [Member] | Mar. 31, 2013 Emissions Allowance [Member] | Mar. 31, 2012 Emissions Allowance [Member] | Apr. 30, 2013 Foreign Currency Contract [Member] | Mar. 31, 2013 Foreign Currency Contract [Member]
Volume of outstanding contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount of price risk derivatives |  |  |  |  | 369 | 3,256 | 2,887 | 1,829 | 347 | 1,482 | 2,267 | 0 | 1,550 | 0 | 50,113 | 19,320,000 | 0 | 0 | 17 | 5,000 | 69,216 | 39,620,000 | 0 | 420,000 | 2 | 12,250,000 | 0 | 0 | 3,000,000 | 0 | 17,358,000 | 447,000 | 43,972 | 1,125,000 | 16,915 | 0 | 43,972 | 500,000 | 16,915 | 0 | 106,227 | 3,500,000 | 2,555,000 | 22,518 | 0 | 0 | 105,432 | 1,500,000 | 2,555,000 | 22,793 | 0 | 0 | 18,660 | 1,250,000 | 0 | 0 | 17,310 | 250,000 | 0 | 0 | 15,600,000 | 0 | 33,038,000 | 0 |  |  |  |  |  |  |
Price Risk Management Activities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance program costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 130 | $ 67 | $ 2 | $ 0 | $ 1 |  |
Notional amount of interest rate derivatives | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives activity |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of foreign currency derivative purchase contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 576
Foreign currency commitments maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2013 |

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