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Derivatives and Hedging Instruments (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Impact of derivative activities recognized in earnings
Total	$ (36)	$ 23
Reclassification from AOCI to earnings during the period to offset a LCM adjustment relating to carrying value of PNG's inventory	6
Commodity | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total	(62)	16
Derivatives in Cash Flow Hedging Relationships - Ineffective Portion	(8)	(1)
Commodity | Transportation segment revenues
Impact of derivative activities recognized in earnings
Total		2
Commodity | Purchases and related costs
Impact of derivative activities recognized in earnings
Total	6	(4)
Commodity | Field Operating costs
Impact of derivative activities recognized in earnings
Total	1	3
Commodity | Facilities segment revenues
Impact of derivative activities recognized in earnings
Total	11
Interest Rate Contracts | Interest expense
Impact of derivative activities recognized in earnings
Total	1	3
Net gain associated with interest rate swaps designated as fair value hedges	2	1
Foreign exchange contracts | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total	1	2
Foreign exchange contracts | Purchases and related costs
Impact of derivative activities recognized in earnings
Total		2
Foreign exchange contracts | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total	6	(1)
Derivatives designated as hedging instruments
Impact of derivative activities recognized in earnings
Total	(137)	25
Derivatives designated as hedging instruments | Commodity | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total	(161)	14
Derivatives designated as hedging instruments | Commodity | Transportation segment revenues
Impact of derivative activities recognized in earnings
Total		2
Derivatives designated as hedging instruments | Commodity | Purchases and related costs
Impact of derivative activities recognized in earnings
Total	6	8
Derivatives designated as hedging instruments | Commodity | Facilities segment revenues
Impact of derivative activities recognized in earnings
Total	11
Derivatives designated as hedging instruments | Interest Rate Contracts | Interest expense
Impact of derivative activities recognized in earnings
Total	1	1
Derivatives designated as hedging instruments | Foreign exchange contracts | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total	6
Derivatives not designated as hedging instruments
Impact of derivative activities recognized in earnings
Total	101	(2)
Derivatives not designated as hedging instruments | Commodity | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total	99	2
Derivatives not designated as hedging instruments | Commodity | Purchases and related costs
Impact of derivative activities recognized in earnings
Total		(12)
Derivatives not designated as hedging instruments | Commodity | Field Operating costs
Impact of derivative activities recognized in earnings
Total	1	3
Derivatives not designated as hedging instruments | Interest Rate Contracts | Interest expense
Impact of derivative activities recognized in earnings
Total		2
Derivatives not designated as hedging instruments | Foreign exchange contracts | Supply and Logistics segment revenues
Impact of derivative activities recognized in earnings
Total	1	2
Derivatives not designated as hedging instruments | Foreign exchange contracts | Purchases and related costs
Impact of derivative activities recognized in earnings
Total		2
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other income/(expense), net
Impact of derivative activities recognized in earnings
Total		$ (1)

X

- Definition

The net gain (loss) for interest expense recognized in earnings during the period associated with interest rate derivatives designated as fair value hedge.

+ References

No definition available.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 25

-Section 50

-Paragraph 1

-Subparagraph (a)(1),(2)

-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The effective portion of gain reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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