Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal Value	$ 8,366,092	$ 9,368,516
Carrying Value	8,315,037	9,324,177
Less: Current portion of debt, principal value	392,915	320,800
Less: Current portion of debt, carrying value	391,801	320,800
Total long-term debt, principal value	7,973,177	9,047,716
Total long-term debt, carrying value	7,923,236	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	282,000	320,800
Carrying Value	$ 282,000	$ 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	$ 391,801	$ 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	$ 114,461	$ 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	$ 4,069	$ 500,000
Carrying Value	$ 4,142	$ 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	$ 504,440	$ 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%
Principal Value	$ 48,868	$ 900,000
Carrying Value	$ 52,222	$ 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	$ 346,700	$ 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%
Principal Value	$ 936,158	$ 1,169,503
Carrying Value	$ 934,206	$ 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	$ 493,773	$ 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%
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	$ 45,027	$ 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	$ 316,117	$ 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	$ 8,338	$ 742,923
Carrying Value	$ 8,031	$ 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	$ 706,891	$ 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	$ 3,265	$ 600,000
Carrying Value	$ 3,307	$ 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	$ 603,781	$ 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	$ 671,952	$ 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	$ 5,536	$ 500,000
Carrying Value	$ 5,894	$ 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	$ 525,994	$ 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	$ 9,616	$ 1,100,000
Carrying Value	$ 9,177	$ 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	$ 1,039,524	$ 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	$ 431,157	$ 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	$ 743,193	$ 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	$ 12,989	$ 80,233
Carrying Value	$ 13,164	$ 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	$ 68,083	$ 0