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Acquisitions, Investments in Unconsolidated Entities, Dispositions and Impairments - Acquisitions (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) acquisition
Acquisitions
Number of acquisitions completed | acquisition	2
Cash consideration	$ 289
Integrated system of NGL assets
Acquisitions
Cash consideration	$ 204

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+ References

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- Definition

The number of businesses acquired by the entity during the period.

+ References

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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