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Subsequent Event (Details) - Scenario, Forecast shares in Millions	Nov. 12, 2018 shares
Equitrans Midstream
Subsequent Event [Line Items]
Percentage of ownership transferred	80.10%
Stock dividend, conversion ratio	0.80
Percentage of ownership after transaction	19.90%
Equitrans Midstream
Subsequent Event [Line Items]
Investment owned (in shares)	255

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+ References

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- Definition

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- Definition

Balance held at close of period in number of shares.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-SubTopic 320
-Section S99
-Paragraph 6
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- Definition

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- Definition

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.

+ References

No definition available.

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