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Financial Information by Business Segment - Schedule of Segment Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Segment assets:
Total assets	$ 28,661,329	$ 29,522,604
Operating Segments
Segment assets:
Total assets	28,228,246	28,805,042
Operating Segments | EQT Production
Segment assets:
Total assets	19,278,308	21,015,132
Operating Segments | EQM Gathering
Segment assets:
Total assets	5,994,891	5,681,404
Operating Segments | EQM Transmission
Segment assets:
Total assets	2,813,644	1,923,427
Operating Segments | EQM Water
Segment assets:
Total assets	141,403	185,079
Headquarters assets, including cash and short-term investments
Segment assets:
Total assets	$ 433,083	$ 717,562

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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