Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Apr. 16, 2025	Mar. 12, 2025	Feb. 24, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal Value	$ 8,269,411				$ 9,368,516
Carrying Value	8,217,822				9,324,177
Less: Current portion of debt, principal value	507,915				320,800
Less: Current portion of debt, carrying value	506,690				320,800
Total long-term debt, principal value	7,761,496				9,047,716
Total long-term debt, carrying value	7,711,132				9,003,377
EQT's revolving credit facility maturing July 23, 2030 | Line of Credit
Debt Instrument [Line Items]
Principal Value	0				150,000
Carrying Value	0				150,000
Eureka's revolving credit facility maturing November 13, 2027 | Line of Credit
Debt Instrument [Line Items]
Principal Value	278,000				320,800
Carrying Value	$ 278,000				$ 320,800
EQT's 3.125% notes due May 15, 2026 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	3.125%				3.125%
Principal Value	$ 392,915				$ 392,915
Carrying Value	$ 392,105				$ 391,193
EQT's 7.75% debentures due July 15, 2026 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	7.75%				7.75%
Principal Value	$ 115,000				$ 115,000
Carrying Value	$ 114,585				$ 114,213
EQM's 7.500% notes due June 1, 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	7.50%				7.50%
Principal Value	$ 0				$ 500,000
Carrying Value	$ 0				$ 511,377
EQT's 7.500% notes due June 1, 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	7.50%				7.50%
Principal Value	$ 495,925				$ 0
Carrying Value	$ 503,329				$ 0
EQM's 6.500% notes due July 1, 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	6.50%		6.50%	6.50%	6.50%
Principal Value	$ 0				$ 900,000
Carrying Value	$ 0				$ 915,538
EQT's 6.500% notes due July 1, 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	6.50%				6.50%
Principal Value	$ 344,921				$ 0
Carrying Value	$ 346,478				$ 0
EQT's 3.90% notes due October 1, 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	3.90%		3.90%	3.90%	3.90%
Principal Value	$ 936,158				$ 1,169,503
Carrying Value	$ 934,423				$ 1,166,523
EQT's 5.700% notes due April 1, 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	5.70%				5.70%
Principal Value	$ 500,000				$ 500,000
Carrying Value	$ 494,339				$ 492,640
EQM's 5.500% notes due July 15, 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	5.50%	5.50%			5.50%
Principal Value	$ 0				$ 118,683
Carrying Value	$ 0				$ 118,204
EQT's 5.500% notes due July 15, 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	5.50%				5.50%
Principal Value	$ 45,225				$ 0
Carrying Value	$ 45,043				$ 0
EQT's 5.00% notes due January 15, 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	5.00%				5.00%
Principal Value	$ 318,494				$ 318,494
Carrying Value	$ 316,283				$ 315,785
EQM's 4.50% notes due January 15, 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	4.50%				4.50%
Principal Value	$ 0				$ 742,923
Carrying Value	$ 0				$ 711,754
EQT's 4.50% notes due January 15, 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	4.50%				4.50%
Principal Value	$ 734,583				$ 0
Carrying Value	$ 708,847				$ 0
EQM's 6.375% notes due April 1, 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	6.375%				6.375%
Principal Value	$ 0				$ 600,000
Carrying Value	$ 0				$ 608,667
EQT's 6.375% notes due April 1, 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	6.375%				6.375%
Principal Value	$ 596,725				$ 0
Carrying Value	$ 603,310				$ 0
EQT's 7.000% notes due February 1, 2030 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	7.00%				7.00%
Principal Value	$ 674,800				$ 674,800
Carrying Value	$ 672,107				$ 671,641
EQM's 7.500% notes due June 1, 2030 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	7.50%				7.50%
Principal Value	$ 0				$ 500,000
Carrying Value	$ 0				$ 535,671
EQT's 7.500% notes due June 1, 2030 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	7.50%				7.50%
Principal Value	$ 494,086				$ 0
Carrying Value	$ 524,372				$ 0
EQM's 4.75% notes due January 15, 2031 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	4.75%				4.75%
Principal Value	$ 0				$ 1,100,000
Carrying Value	$ 0				$ 1,045,219
EQT's 4.75% notes due January 15, 2031 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	4.75%				4.75%
Principal Value	$ 1,090,218				$ 0
Carrying Value	$ 1,041,811				$ 0
EQT's 3.625% notes due May 15, 2031 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	3.625%				3.625%
Principal Value	$ 435,165				$ 435,165
Carrying Value	$ 431,326				$ 430,818
EQT's 5.750% notes due February 1, 2034 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	5.75%				5.75%
Principal Value	$ 750,000				$ 750,000
Carrying Value	$ 743,391				$ 742,796
EQM's 6.500% notes due July 15, 2048 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	6.50%				6.50%
Principal Value	$ 0				$ 80,233
Carrying Value	$ 0				$ 81,338
EQT's 6.500% notes due July 15, 2048 | Senior Notes
Debt Instrument [Line Items]
Interest rate, stated percentage (in percent)	6.50%				6.50%
Principal Value	$ 67,196				$ 0
Carrying Value	$ 68,073				$ 0