Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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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.

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The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings.

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Net gain (loss) relating to components of the gain (loss) on the fair value hedging instrument excluded from the assessment of fair value hedge effectiveness. Recognized in earnings.

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Amount of net gain (loss) recognized in earnings when a hedged firm commitment no longer qualifies as a fair value hedge.

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The amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

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Date when foreign currency exchange rate derivatives mature or expire.

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Aggregate notional amount of price risk derivatives for instruments with notional amounts expressed in nonmonetary units.

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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.

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Price Risk Management Activities.

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Volume of outstanding contracts.

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Price Risk Management Activities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Purchases (Long) [Member] Cash Flow Hedging [Member] Swap [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Fair Value Hedging [Member] Forward Contracts [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Sep. 30, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Sep. 30, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Year Three [Member] Grain In Bushels [Member]	Sep. 30, 2011 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Three [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas In Btus [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas In Btus [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Sep. 30, 2011 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Cash Flow Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] 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Economic Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain In Bushels [Member]	Sep. 30, 2011 Economic Hedging [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Three [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Economic Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Sep. 30, 2011 Economic Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Sep. 30, 2011 Economic Hedging [Member] Forward Contracts [Member] Sales (Short) [Member] Maturity Year Three [Member] Grain In Bushels [Member]	Sep. 30, 2011 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Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas In Btus [Member]	Sep. 30, 2011 Trading Derivatives [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Trading Derivatives [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Sep. 30, 2011 Forward Contracts [Member]	Sep. 30, 2011 Refining Industry [Member]	Dec. 31, 2010 Refining Industry [Member]	Sep. 30, 2011 Financial Services Industry [Member]	Dec. 31, 2010 Financial Services Industry [Member]
Volume of outstanding contracts
Nonmonetary notional amount of price risk derivatives					5,241,000	3,025,000	13,428,000	34,708,000	65,040,000	0	200,076,000	22,325,000	40,388,000	8,405,000	0	0	606,000	10,000	0	6,196,000	0	3,240,000	1,050,000	66,365,000	5,050,000	3,850,000	15,868,000	0	60,000	16,453,000	5,241,000	33,890,000	65,040,000	0	192,292,000	41,300,000	41,219,000	23,980,000	0	260,000	600,000	0	0	12,166,000	10,991,000	265,000	6,196,000	0	3,240,000	1,050,000	66,389,000	5,050,000	2,350,000	15,831,000	0	1,060,000	75,000	0
Price Risk Management Activities (Textual)
Notional amount of foreign currency derivative purchase contracts																																																											$ 475
Foreign currency commitments maturity date																																																											October 28, 2011
Net receivables related to derivative instruments from counterparties																																																												1	4	0	21
Gain (loss) from components excluded from assessment of fair value hedge effectiveness, net	0	0	0	0
Gain (loss) from hedged firm commitment not qualifying as fair value hedge, net	0	0	0	0
Gain (loss) from components excluded from assessment of cash flow hedge effectiveness, net	0	0	0	0
Accumulated other comprehensive income, cumulative gains on cash flow hedges	13		13
Gain (loss) from cash flow hedges to be reclassified within 12 months			10
Amount reclassifed from accumulated OCI into income on discontinuance of cash flow hedges	$ 0	$ 0	$ 0	$ 0