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Impairment of Contract Asset	12 Months Ended
Impairment of Contract Asset	Dec. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]
Impairment of Contract Asset	Impairment of Contract Asset During the first quarter of 2020, the Company sold to Equitrans Midstream approximately 50% of the Company's then-owned equity interest in Equitrans Midstream in exchange for a combination of cash and rate relief under certain of the Company's gathering contracts with an affiliate of Equitrans Midstream (the Equitrans Share Exchange). The rate relief was effected through the execution of a consolidated gas gathering and compression agreement entered into between the Company and an affiliate of Equitrans Midstream (the Consolidated GGA). On the closing date of the Equitrans Share Exchange, the Company recorded in the Consolidated Balance Sheet a contract asset of $410 million representing the estimated fair value of the rate relief inclusive of the Cash Payment Option (defined below). Because the Mountain Valley Pipeline was not in service by January 1, 2022, the Consolidated GGA provided the Company the option to forgo a portion of the gathering fee relief that would otherwise be applicable following the Mountain Valley Pipeline in-service date in exchange for a cash payment of approximately $196 million (the Cash Payment Option). During the third quarter of 2022, the Company elected to exercise the Cash Payment Option, and, in the fourth quarter of 2022, the Company received the cash proceeds from the Cash Payment Option. During 2022, the Company identified indicators that the carrying value of the contract asset may not be fully recoverable, including increased uncertainty of the estimated timing of completion of the Mountain Valley Pipeline due to court rulings and public statements from Equitrans Midstream with respect to its completion. As a result of the Company's impairment evaluation, the Company recognized impairment of the contract asset during the first quarter of 2022 of $184.9 million in the Statement of Consolidated Operations. During the fourth quarter of 2022, the Company recognized additional impairment of the contract asset of $29.3 million in the Statement of Consolidated Operations. As of December 31, 2022, the previously recognized impairments plus the election of the Cash Payment Option reduced the carrying value of the contract asset to zero. The fair value of the contract asset was based on significant inputs that are not observable in the market and, as such, is a Level 3 fair value measurement. See Note 4 for a description of the fair value hierarchy. Key assumptions used in the fair value calculation included the following: (i) a probability-weighted estimate of the in-service date of the Mountain Valley Pipeline; (ii) an estimate of the potential exercise and timing of the Cash Payment Option; (iii) an estimated production volume forecast and (iv) a market-based weighted average cost of capital.