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Derivatives and Risk Management Activities (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Level 3	Mar. 31, 2011 Level 3	Mar. 31, 2012 Recurring Fair Value Measures Level 1	Dec. 31, 2011 Recurring Fair Value Measures Level 1	Mar. 31, 2012 Recurring Fair Value Measures Level 1 Commodity	Dec. 31, 2011 Recurring Fair Value Measures Level 1 Commodity	Mar. 31, 2012 Recurring Fair Value Measures Level 2	Dec. 31, 2011 Recurring Fair Value Measures Level 2	Dec. 31, 2011 Recurring Fair Value Measures Level 2 Commodity	Mar. 31, 2012 Recurring Fair Value Measures Level 2 Interest Rate Contracts	Dec. 31, 2011 Recurring Fair Value Measures Level 2 Interest Rate Contracts	Mar. 31, 2012 Recurring Fair Value Measures Level 2 Foreign exchange contracts	Dec. 31, 2011 Recurring Fair Value Measures Level 2 Foreign exchange contracts	Mar. 31, 2012 Recurring Fair Value Measures Level 3	Dec. 31, 2011 Recurring Fair Value Measures Level 3	Mar. 31, 2012 Recurring Fair Value Measures Level 3 Commodity	Dec. 31, 2011 Recurring Fair Value Measures Level 3 Commodity	Mar. 31, 2012 Recurring Fair Value Measures Total	Dec. 31, 2011 Recurring Fair Value Measures Total	Mar. 31, 2012 Recurring Fair Value Measures Total Commodity	Dec. 31, 2011 Recurring Fair Value Measures Total Commodity	Mar. 31, 2012 Recurring Fair Value Measures Total Interest Rate Contracts	Dec. 31, 2011 Recurring Fair Value Measures Total Interest Rate Contracts	Mar. 31, 2012 Recurring Fair Value Measures Total Foreign exchange contracts	Dec. 31, 2011 Recurring Fair Value Measures Total Foreign exchange contracts
Recurring Fair Value Measures
Net asset/(liability) at fair value			$ 37	$ 80	$ 37	$ 80	$ (62)	$ (135)	$ 1	$ (63)	$ (137)	$ 1	$ 1	$ 2	$ 12	$ 2	$ 12	$ (23)	$ (43)	$ 39	$ 93	$ (63)	$ (137)	$ 1	$ 1
Roll forward of Level 3 Net Liability
Beginning Balance	12	(14)
Unrealized gains/(losses):
Included in earnings	(4)	6
Included in other comprehensive income	3	(2)
Settlements	(12)	32
Derivatives entered into during the period	3	(10)
Transfers out of Level 3		(17)
Ending Balance	2	(5)
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods	$ (1)	$ (3)

X

- Definition

This element represents a certain statement of financial position asset (liability) caption which represents a class of assets (liabilities), or which may include an individual asset (liability), measured at fair value on a recurring basis.

+ References

No definition available.

+ Details

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X

- Definition

Settlements that have taken place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Derivatives entered place during the period in relation to assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

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X

- Definition

The total gains or losses for the period (realized and unrealized), arising from the derivative net asset/liability balance measured at fair value on a recurring basis using unobservable inputs (Level 3) which are included in earnings or resulted in a changed in net asset/liability balance.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets).Such unrealized (holding) gains or losses relate to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

No definition available.

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- Definition

The total gains or losses for the period (realized and unrealized), arising from the derivative net asset/liability balance measured at fair value on a recurring basis using unobservable inputs (Level 3) which are included in other comprehensive income (a separate component of shareholders' equity).

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

The derivative net asset/liability balance measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

No definition available.

+ Details

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- Definition

Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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