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Derivatives and Risk Management Activities (Details 5) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Derivatives disclosures
Derivative assets designated as hedging instruments	$ 111		$ 111		$ 81
Derivative assets not designated as hedging instruments	137		137		39
Total derivative assets	248		248		120
Derivative liabilities designated as hedging instruments	(92)		(92)		(72)
Derivative liabilities not designated as hedging instruments	(127)		(127)		(78)
Liabilities at fair value	(219)		(219)		(150)
Net gain (loss) deferred in AOCI	59		59
Net gain (loss) expected to be reclassified to earnings in next 12 months			41
Gain (loss) expected to be reclassified to earnings prior to 2014			13
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion)	52	19	(92)	14
Gain (loss) on discontinued cash flow hedge reclassified to earnings during the year	1		1
Commodity
Derivatives disclosures
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion)	48	18	(97)	14
Commodity | Other current assets
Derivatives disclosures
Derivative assets designated as hedging instruments	97		97		71
Derivative assets not designated as hedging instruments	128		128		11
Derivative liabilities designated as hedging instruments	(90)		(90)		(70)
Derivative liabilities not designated as hedging instruments	(114)		(114)		(68)
Commodity | Other long-term assets
Derivatives disclosures
Derivative assets designated as hedging instruments	7		7
Derivative assets not designated as hedging instruments	8		8		20
Derivative liabilities designated as hedging instruments	(1)		(1)		(1)
Derivative liabilities not designated as hedging instruments	(9)		(9)
Commodity | Other current liabilities
Derivatives disclosures
Derivative assets not designated as hedging instruments					2
Derivative liabilities designated as hedging instruments					(1)
Derivative liabilities not designated as hedging instruments					(10)
Interest Rate Contracts
Derivatives disclosures
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion)	4	1	6	1
Interest Rate Contracts | Other current assets
Derivatives disclosures
Derivative assets designated as hedging instruments	5		5		10
Derivative assets not designated as hedging instruments					4
Interest Rate Contracts | Other long-term assets
Derivatives disclosures
Derivative assets designated as hedging instruments	2		2
Derivative assets not designated as hedging instruments					1
Foreign exchange contracts
Derivatives disclosures
Net deferred gain/(loss) recognized in AOCI on derivatives (effective portion)			(1)	(1)
Foreign exchange contracts | Other current assets
Derivatives disclosures
Derivative assets not designated as hedging instruments	1		1		1
Foreign exchange contracts | Other current liabilities
Derivatives disclosures
Derivative liabilities designated as hedging instruments	(1)		(1)
Derivative liabilities not designated as hedging instruments	$ (4)		$ (4)

X

- Definition

The estimated net amount of existing gains (losses) on cash flow hedges at the reporting date expected to be reclassified to earnings within year two and year three following the date of the latest balance sheet presented in the financial statements.

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- Definition

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 (decrease) in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
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The estimated net amount of existing gains (losses) on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
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Fair value of a derivative asset (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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-Paragraph 205G

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Fair value of a derivative asset that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 205G

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Fair value of a derivative liability (or nonderivative instrument) that is designated and qualifies as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

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Fair value of a derivative liability that is not designated or qualifying as a hedging instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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The amount of gain 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.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph b(4)

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