Summary of Significant Accounting Policies - Schedule of Regulatory Assets and Liabilities (Details) - Equitrans LP $ in Thousands	Dec. 31, 2024 USD ($)
Regulated assets:
Total regulated assets	$ 165,939
Regulated liabilities:
Total regulated liabilities	28,692
Deferred taxes
Regulated liabilities:
Total regulated liabilities	8,534
On-going post-retirement benefits other than pension and other reimbursable costs
Regulated liabilities:
Total regulated liabilities	20,158
Deferred taxes
Regulated assets:
Total regulated assets	142,757
Other recoverable costs
Regulated assets:
Total regulated assets	$ 23,182
Asset retirement obligations
Regulated liabilities:
Remaining recovery period	9 years 6 months
On-going post-retirement benefits other than pension and other reimbursable costs
Regulated liabilities:
Remaining recovery period	7 years 6 months