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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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