Derivative Instruments - Narrative (Details)	9 Months Ended			12 Months Ended
	Sep. 30, 2025 USD ($) Bcf	Sep. 30, 2025 USD ($) MBbls	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($) Bcf	Dec. 31, 2024 USD ($) MBbls
Derivative Instruments, Gain (Loss)
Maximum additional collateral as percentage of derivative liability (in percent)			100.00%
Aggregate fair value of derivative instruments with credit-risk related contingencies	$ 43,200,000	$ 43,200,000	$ 43,200,000	$ 61,900,000	$ 61,900,000
Collateral posted	0	0	0	0	0
OTC Derivative Instrument Contracts
Derivative Instruments, Gain (Loss)
Aggregate fair value of derivative instruments with credit-risk related contingencies	0	0	0	0	0
Exchange traded natural gas contracts
Derivative Instruments, Gain (Loss)
Collateral posted	$ 53,000,000	$ 53,000,000	$ 53,000,000	$ 87,000,000	$ 87,000,000
Cash flow hedging | Commodity derivatives
Derivative Instruments, Gain (Loss)
Volume of derivative instruments (in Bcf, Mbbls)	1,068	5,114		2,189	2,562