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Derivatives and Risk Management Activities (Details 7) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Level 3	Mar. 31, 2013 Level 3	Mar. 31, 2014 Recurring Fair Value Measures Level 1	Dec. 31, 2013 Recurring Fair Value Measures Level 1	Mar. 31, 2014 Recurring Fair Value Measures Level 1 Commodity Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Level 1 Commodity Derivatives	Mar. 31, 2014 Recurring Fair Value Measures Level 2	Dec. 31, 2013 Recurring Fair Value Measures Level 2	Mar. 31, 2014 Recurring Fair Value Measures Level 2 Commodity Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Level 2 Commodity Derivatives	Mar. 31, 2014 Recurring Fair Value Measures Level 2 Interest Rate Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Level 2 Interest Rate Derivatives	Mar. 31, 2014 Recurring Fair Value Measures Level 2 Foreign Currency Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Level 2 Foreign Currency Derivatives	Mar. 31, 2014 Recurring Fair Value Measures Level 3	Dec. 31, 2013 Recurring Fair Value Measures Level 3	Mar. 31, 2014 Recurring Fair Value Measures Level 3 Commodity Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Level 3 Commodity Derivatives	Mar. 31, 2014 Recurring Fair Value Measures Total	Dec. 31, 2013 Recurring Fair Value Measures Total	Mar. 31, 2014 Recurring Fair Value Measures Total Commodity Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Total Commodity Derivatives	Mar. 31, 2014 Recurring Fair Value Measures Total Interest Rate Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Total Interest Rate Derivatives	Mar. 31, 2014 Recurring Fair Value Measures Total Foreign Currency Derivatives	Dec. 31, 2013 Recurring Fair Value Measures Total Foreign Currency Derivatives
Recurring Fair Value Measures
Net derivative asset/(liability)			$ 46	$ 16	$ 46	$ 16	$ 11	$ (37)	$ 8	$ (59)	$ 6	$ 26	$ (3)	$ (4)	$ 1	$ (3)	$ 1	$ (3)	$ 58	$ (24)	$ 55	$ (46)	$ 6	$ 26	$ (3)	$ (4)
Roll forward of Level 3 Net Asset
Beginning Balance	(3)	4
Settlements	3	(3)
Derivatives entered into during the period	1
Ending Balance	1	1
Change in unrealized gains/(losses) included in earnings relating to level 3 derivatives still held at the end of the periods	$ 1

X

- Definition

Derivatives entered into 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.

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- 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

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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- Definition

Amount of settlements of financial instrument classified as a derivative asset (liability) after deduction of derivative liability, measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258



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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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