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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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		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Fair Value Hedging [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Fair Value Hedging [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Cash Flow Hedging [Member]	Jun. 30, 2011 Nondesignated [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Jun. 30, 2011 Nondesignated [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Nondesignated [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Swap [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Swap [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Natural Gas In Btus [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Natural Gas In Btus [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Purchases (Long) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Natural Gas In Btus [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Current Year [Member] Grain In Bushels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Natural Gas In Btus [Member]	Jun. 30, 2011 Commodity [Member] Future [Member] Sales (Short) [Member] Maturity Year Two [Member] Grain In Bushels [Member]	Jun. 30, 2011 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Options Held [Member] Purchases (Long) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Current Year [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Commodity [Member] Options Held [Member] Sales (Short) [Member] Maturity Year Two [Member] Crude Oil In Barrels [Member]	Jun. 30, 2011 Forward Contracts [Member]	Jun. 30, 2011 Refining Industry [Member]	Dec. 31, 2010 Refining Industry [Member]	Jun. 30, 2011 Financial Services Industry [Member]	Dec. 31, 2010 Financial Services Industry [Member]
Volume of outstanding contracts
Nonmonetary notional amount of price risk derivatives					5,878,000	18,734,000	0	74,882,000	51,750,000	73,791,000	51,750,000	203,662,000	78,065,000	10,584,000	8,405,000	198,509,000	109,420,000	9,326,000	19,155,000	1,200,000	0	1,200,000	0	12,167,000	1,500,000	12,167,000	1,500,000	71,114,000	4,850,000	4,925,000	13,089,000	0	60,000	71,159,000	4,600,000	4,525,000	13,054,000	0	60,000	1,545,000	0	1,545,000	0
Price Risk Management Activities (Textual)
Notional amount of foreign currency derivative purchase contracts																																												$ 480
Foreign currency commitments maturity date																																												July 28, 2011
Net receivables related to derivative instruments from counterparties																																													1	4	3	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	0		0
Amount reclassifed from accumulated OCI into income on discontinuance of cash flow hedges	$ 0	$ 0	$ 0	$ 0