STATEMENTS OF CONDENSED CONSOLIDATED EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Total	Equitrans Midstream Merger	Olympus Energy Acquisition	Common Stock	Common Stock Equitrans Midstream Merger	Common Stock Olympus Energy Acquisition	Retained Earnings	Accumulated Other Comprehensive Loss		Noncontrolling Interest in Consolidated Subsidiaries	Noncontrolling Interest in Consolidated Subsidiaries Equitrans Midstream Merger
Beginning balance (in shares) at Dec. 31, 2023				419,896
Beginning balance at Dec. 31, 2023	$ 14,780,817			$ 12,093,986			$ 2,681,898	$ (2,684)	[1]	$ 7,617
Comprehensive (loss) income, net of tax
Net (loss) income	(185,130)						(187,818)			2,688
Other post-retirement benefits liability adjustment, net of tax	114							114	[1]
Dividends	(232,994)						(232,994)
Share-based compensation plans (in shares)				3,952
Share-based compensation plans	54,751			$ 54,751
Convertible Notes settlements (Note 7) (in shares)				19,992
Convertible Notes settlements (Note 7)	285,608			$ 285,608
Net settlement of Capped Call Transactions (Note 7)	93,290			$ 93,290
Merger and Acquisition (in shares)					152,428
Merger and Acquisition		$ 5,693,502			$ 5,548,608						$ 144,894
Distributions to noncontrolling interest	(1,640)									(1,640)
Ending balance (in shares) at Sep. 30, 2024				596,268
Ending balance at Sep. 30, 2024	20,488,318			$ 18,076,243			2,261,086	(2,570)	[1]	153,559
Beginning balance (in shares) at Jun. 30, 2024				441,597
Beginning balance at Jun. 30, 2024	15,124,748			$ 12,464,492			2,655,940	(2,598)	[2]	6,914
Comprehensive (loss) income, net of tax
Net (loss) income	(297,432)						(300,823)			3,391
Other post-retirement benefits liability adjustment, net of tax	28							28	[2]
Dividends	(94,031)						(94,031)
Share-based compensation plans (in shares)				2,243
Share-based compensation plans	63,143			$ 63,143
Merger and Acquisition (in shares)					152,428
Merger and Acquisition		5,693,502			$ 5,548,608						144,894
Distributions to noncontrolling interest	(1,640)									(1,640)
Ending balance (in shares) at Sep. 30, 2024				596,268
Ending balance at Sep. 30, 2024	20,488,318			$ 18,076,243			2,261,086	(2,570)	[1]	153,559
Beginning balance (in shares) at Dec. 31, 2024				596,870
Beginning balance at Dec. 31, 2024	24,278,136			$ 18,014,711			2,585,238	(2,321)	[1]	3,680,508
Comprehensive (loss) income, net of tax
Net (loss) income	1,579,290						1,362,148			217,142
Other post-retirement benefits liability adjustment, net of tax	151							151	[1]
Dividends	(284,250)						(284,250)
Share-based compensation plans (in shares)				1,965
Share-based compensation plans	4,205			$ 4,205
Convertible Notes settlements (Note 7)	0
Merger and Acquisition (in shares)						25,229
Merger and Acquisition		$ 248	$ 1,471,365			$ 1,471,365					$ 248
Change in ownership of consolidated subsidiary	375			$ 375
Distributions to noncontrolling interest	(259,217)									(259,217)
Ending balance (in shares) at Sep. 30, 2025				624,064
Ending balance at Sep. 30, 2025	26,790,303			$ 19,490,656			3,663,136	(2,170)	[2]	3,638,681
Beginning balance (in shares) at Jun. 30, 2025				598,812
Beginning balance at Jun. 30, 2025	25,097,850			$ 17,999,758			3,425,732	(2,230)	[2]	3,674,590
Comprehensive (loss) income, net of tax
Net (loss) income	407,216						335,862			71,354
Other post-retirement benefits liability adjustment, net of tax	60							60	[2]
Dividends	(98,458)						(98,458)
Share-based compensation plans (in shares)				23
Share-based compensation plans	19,533			$ 19,533
Merger and Acquisition (in shares)						25,229
Merger and Acquisition			$ 1,471,365			$ 1,471,365
Distributions to noncontrolling interest	(107,263)									(107,263)
Ending balance (in shares) at Sep. 30, 2025				624,064
Ending balance at Sep. 30, 2025	$ 26,790,303			$ 19,490,656			$ 3,663,136	$ (2,170)	[2]	$ 3,638,681

[1] Amounts included in accumulated other comprehensive loss are related to other postretirement benefits liability adjustments, net of tax, which are attributable to net actuarial losses and net prior service costs.

[2] Amounts included in accumulated other comprehensive loss are related to other postretirement benefits liability adjustments, net of tax, which are attributable to net actuarial losses and net prior service costs.