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Acquisitions and Dispositions - Acquisitions (Details) $ in Millions |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 14, 2017 USD ($) a bbl / d market_interconnect mi | Feb. 28, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |
Cash paid in connection with acquisitions |  |  | $ 1,282 | $ 282
Acquisition related costs |  |  | 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 |  |  | $ 6 |
Propane marine terminal |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid in connection with acquisitions |  | $ 41 |  |

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- Definition Business Combination, Property And Plant Acquired, Length Of Gathering And Transmission Lines + References No definition available. + Details
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- Definition 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 + Details
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- Definition 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 + Details
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