Debt - Narrative (Details) $ in Thousands						1 Months Ended	2 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 29, 2025	Apr. 02, 2025 USD ($)	Feb. 24, 2025 USD ($)	Jul. 22, 2024 extension	Jan. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 12, 2025	Dec. 31, 2024 USD ($)	Apr. 30, 2020 USD ($)
Line of Credit Facility
Debt instrument, face amount								$ 8,269,411		$ 8,269,411			$ 9,368,516
Loss on debt extinguishment								$ 1,909	$ 365	19,478	$ 5,651
Aggregate proceeds from capped call termination payment										$ 0	93,290
Call Option
Line of Credit Facility
Aggregate proceeds from capped call termination payment						$ 93,300
EQM's 6.500% notes due July 1, 2027 | Senior Notes
Line of Credit Facility
Interest rate, stated percentage (in percent)				6.50%				6.50%		6.50%		6.50%	6.50%
Debt instrument, face amount								$ 0		$ 0			$ 900,000
New EQT Notes
Line of Credit Facility
Debt instrument, face amount				$ 4,541,800
Debt conversion, converted instrument, amount			$ 3,868,900
New EQT Notes | Conversion Period One
Line of Credit Facility
Conversion ratio				0.001
New EQT Notes | Conversion Period Two
Line of Credit Facility
Conversion ratio				0.950
Previously Existing EQM Notes | Senior Notes
Line of Credit Facility
Debt conversion, original debt, amount			3,869,500
Cash consideration			3,900
Discount received on existing notes			$ 600
Loss on debt extinguishment										9,600
1.75% convertible notes due May 1, 2026 | Senior Notes
Line of Credit Facility
Interest rate, stated percentage (in percent)														1.75%
Debt instrument, face amount														$ 500,000
Revolving credit facility | EQT Fourth A& R Revolving Credit Facility
Line of Credit Facility
Line of credit facility, maximum borrowing capacity								3,500,000		3,500,000
Number of extensions | extension					2
Extension term					1 year
Letters of credit outstanding under revolving credit facility (less than)								2,000		2,000			1,000
Maximum amount of outstanding short-term loans at any time during the period								283,000	2,301,000	566,000	2,301,000
Average daily balance of short-term loans outstanding during the period								$ 88,000	$ 1,608,000	$ 120,000	$ 551,000
Weighted average interest rates (in percent)								5.90%	6.90%	5.90%	6.90%
Unused commitment fee paid to maintain credit facility (in percent)										0.20%	0.20%
Revolving credit facility | Eureka Revolving Credit Facility
Line of Credit Facility
Line of credit facility, maximum borrowing capacity								$ 400,000		$ 400,000
Letters of credit outstanding under revolving credit facility (less than)								0		0			$ 0
Maximum amount of outstanding short-term loans at any time during the period							$ 330,000	282,000		321,000
Average daily balance of short-term loans outstanding during the period								$ 280,000		$ 291,000
Weighted average interest rates (in percent)							8.10%	6.90%		7.10%
Unused commitment fee paid to maintain credit facility (in percent)							0.50%
Revolving credit facility | Eureka Revolving Credit Facility | Minimum
Line of Credit Facility
Unused commitment fee paid to maintain credit facility (in percent)	0.325%	0.375%								0.325%
Revolving credit facility | Eureka Revolving Credit Facility | Maximum
Line of Credit Facility
Unused commitment fee paid to maintain credit facility (in percent)	0.45%	0.50%								0.50%