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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended | 1 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Interest Rate Swap [Member] | Dec. 31, 2011 Interest Rate Swap [Member] | Dec. 31, 2010 Interest Rate Swap [Member] | Jan. 31, 2013 Forward Contracts [Member] | Dec. 31, 2012 Forward Contracts [Member] | Dec. 31, 2012 Biofuels Blending [Member] | Dec. 31, 2011 Biofuels Blending [Member] | Dec. 31, 2010 Biofuels Blending [Member] | Dec. 31, 2012 Minimum Inventory [Member] | Dec. 31, 2011 Minimum Inventory [Member] | Dec. 31, 2012 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Fair Value Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Cash Flow Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Cash Flow Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Cash Flow Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Cash Flow Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Cash Flow Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Emission Allowances (In metric tons) [Member] Mg | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (In millions of btus) [Member] MMBTU | Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Natural Gas (In millions of btus) [Member] MMBTU | Dec. 31, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Economic Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Swap [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas (In millions of btus) [Member] MMBTU | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Natural Gas (In millions of btus) [Member] MMBTU | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas (In millions of btus) [Member] MMBTU | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Natural Gas (In millions of btus) [Member] MMBTU | Dec. 31, 2012 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain (In bushels) [Member] bu | Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil (In thousands of barrels) [Member] MBbls | Dec. 31, 2012 Cost of Sales [Member] Economic Hedging [Member] | Dec. 31, 2011 Cost of Sales [Member] Economic Hedging [Member] | Dec. 31, 2010 Cost of Sales [Member] Economic Hedging [Member] | Dec. 31, 2012 Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member] | Dec. 31, 2011 Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member] | Dec. 31, 2010 Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member] | Dec. 31, 2012 Subsequent Event [Member] Cost of Sales [Member] Foreign Currency Contract [Member] Economic Hedging [Member]
Volume of Outstanding Contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nonmonetary notional amount of price risk derivatives |  |  |  |  |  |  |  |  |  |  |  |  | 1,052 | 4,857 | 3,805 | 1,300 | 1,300 | 11,894 | 2,981 | 8,913 | 1,687 | 0 | 895 | 0 | 68,000 | 48,109 | 13,995,000 | 0 | 5,000 | 63,769 | 28,680,000 | 0 | 25,000 | 10 | 16,750,000 | 0 | 0 | 16,378,000 | 29,000 | 61,002 | 3,135,000 | 9,000 | 0 | 60,819 | 5,045,000 | 9,000 | 0 | 69,939 | 1,450,000 | 4,830,000 | 2,236 | 0 | 0 | 69,923 | 400,000 | 4,830,000 | 2,236 | 0 | 0 | 2,750 | 0 | 3,400 | 0 |  |  |  |  |  |  |
Price Risk Management Activities (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compliance program costs |  |  |  |  |  |  |  | $ 250 | $ 231 | $ 66 | $ 8 | $ 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate derivatives | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives activity |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of foreign currency derivative purchase contracts |  |  |  |  |  |  | 552 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency commitments maturity date |  |  |  |  |  | Jan. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on foreign currency commitments open at period end to be recognized in subsequent quarter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (37) | $ (302) | $ (234) | $ (38) | $ 18 | $ (24) | $ 1

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