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Acquisitions and Dispositions - Acquisitions (Details) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 14, 2017 USD ($) a bbl / d market_interconnect mi	Feb. 28, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)
Business Acquisition [Line Items]
Cash paid in connection with acquisitions				$ 1,281	$ 85
Acquisition related costs			$ 1	6
ACC Acquisition
Business Acquisition [Line Items]
Cash paid in connection with acquisitions	$ 1,217
Length of gathering and transmission lines (in miles) | mi	515
Number of market interconnects | market_interconnect	5
Additional volume enhancements to gathering system (in bbl per day) | bbl / d	350,000
Area of acreage dedications (in acres) | a	315,000
Acquisition related costs			$ 1	$ 6
Propane marine terminal
Business Acquisition [Line Items]
Cash paid in connection with acquisitions		$ 41

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Business Combination, Property And Plant Acquired, Area Of Oil And Gas Contract

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Business Combination, Property And Plant Acquired, Number Of Market Interconnects

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- Definition

Business Combination, Property And Plant Acquired, Volume Per Duration Of Additional Enhancements

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460

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The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

+ 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=98514028&loc=d3e3213-108585

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