Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: 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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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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No definition available.

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Subsequent Events (Details Textuals) - USD ($) $ in Millions		9 Months Ended
	Oct. 20, 2016	Sep. 30, 2016	Sep. 30, 2015
Subsequent Event [Line Items]
Cash paid for gathering assets		$ 0	$ 241
Subsequent Event \| Midstream Natural Gas Assets
Subsequent Event [Line Items]
Purchase price of assets	$ 1,300
Cash paid for gathering assets	1,200
Debt issued during business acquisition	$ 110
M3 Midstream \| Pennsylvania and West Virginia \| Midstream Natural Gas Assets
Subsequent Event [Line Items]
Percent of assets acquired		100.00%
M3 Midstream \| West Virginia \| Midstream Natural Gas Assets
Subsequent Event [Line Items]
Percent of assets acquired		40.00%
Vega Energy Partners \| West Virginia \| Midstream Natural Gas Assets
Subsequent Event [Line Items]
Percent of assets acquired		15.00%