v3.26.1
Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Principal Value $ 5,696,542 $ 7,855,486
Carrying Value 5,655,714 7,800,328
Less: Current portion of debt, principal value 115,000 507,915
Less: Current portion of debt, carrying value 114,959 507,119
Total long-term debt, principal value 5,581,542 7,347,571
Total long-term debt, carrying value 5,540,755 7,293,209
EQT's revolving credit facility maturing July 23, 2030 | Line of Credit    
Debt Instrument [Line Items]    
Principal Value 52,000 75,000
Carrying Value 52,000 75,000
Eureka's revolving credit facility maturing November 13, 2027 | Line of Credit    
Debt Instrument [Line Items]    
Principal Value 272,000 285,000
Carrying Value $ 272,000 $ 285,000
3.125% notes due May 15, 2026 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 3.125% 3.125%
Principal Value $ 0 $ 392,915
Carrying Value $ 0 $ 392,409
7.75% debentures due July 15, 2026 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 7.75% 7.75%
Principal Value $ 115,000 $ 115,000
Carrying Value $ 114,959 $ 114,710
6.500% notes due July 1, 2027 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 6.50% 6.50%
Principal Value $ 0 $ 344,921
Carrying Value $ 0 $ 346,255
3.900% notes due October 1, 2027 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 3.90% 3.90%
Principal Value $ 533,809 $ 936,158
Carrying Value $ 533,191 $ 934,640
5.700% notes due April 1, 2028 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 5.70% 5.70%
Principal Value $ 500,000 $ 500,000
Carrying Value $ 496,037 $ 494,905
5.500% notes due July 15, 2028 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 5.50% 5.50%
Principal Value $ 45,225 $ 45,225
Carrying Value $ 45,120 $ 45,060
5.00% notes due January 15, 2029 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 5.00% 5.00%
Principal Value $ 318,494 $ 318,494
Carrying Value $ 316,780 $ 316,448
4.50% notes due January 15, 2029 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 4.50% 4.50%
Principal Value $ 299,560 $ 734,583
Carrying Value $ 291,457 $ 710,802
6.375% notes due April 1, 2029 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 6.375% 6.375%
Principal Value $ 48,989 $ 596,725
Carrying Value $ 49,447 $ 602,840
7.000% notes due February 1, 2030 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 7.00% 7.00%
Principal Value $ 674,800 $ 674,800
Carrying Value $ 672,573 $ 672,263
7.500% notes due June 1, 2030 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 7.50% 7.50%
Principal Value $ 494,086 $ 494,086
Carrying Value $ 519,593 $ 522,749
4.75% notes due January 15, 2031 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 4.75% 4.75%
Principal Value $ 1,090,218 $ 1,090,218
Carrying Value $ 1,048,674 $ 1,044,098
3.625% notes due May 15, 2031 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 3.625% 3.625%
Principal Value $ 435,165 $ 435,165
Carrying Value $ 431,834 $ 431,496
5.750% notes due February 1, 2034 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 5.75% 5.75%
Principal Value $ 750,000 $ 750,000
Carrying Value $ 743,986 $ 743,589
6.500% notes due July 15, 2048 | Senior Notes    
Debt Instrument [Line Items]    
Interest rate (percent) 6.50% 6.50%
Principal Value $ 67,196 $ 67,196
Carrying Value $ 68,063 $ 68,064