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Equity and Distributions, Noncontrolling Interests (Details) $ in Billions	9 Months Ended
	Sep. 30, 2015 USD ($)
Noncontrolling Interest
Noncontrolling interests acquired	$ 1.4
Panola Pipeline Company, LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Parent (in hundredths)	55.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths)	45.00%
Anadarko Petroleum Corporation [Member] | Panola Pipeline Company, LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths)	15.00%
DCP Midstream Partners, LP [Member] | Panola Pipeline Company, LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths)	15.00%
MarkWest Energy Partners, L.P. [Member] | Panola Pipeline Company, LLC [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners (in hundredths)	15.00%

X

- Definition

Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.3-04)



-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 45



-Paragraph 23



-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569655-111683



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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 45



-Paragraph 24



-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4616395-111683

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