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Long-Term Debt and Credit Agreements - Schedule of Long-term Debt (Details) - USD ($)	1 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2024	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total debt			$ 2,075,000,000	$ 2,949,000,000
Net premium			111,000,000	185,000,000
Unamortized debt issuance costs			(5,000,000)	(9,000,000)
Long-term debt			2,181,000,000	3,125,000,000
Senior Notes \| Cimarex
Debt Instrument [Line Items]
Total debt			130,000,000
Revolving credit facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Total debt			$ 0	0
6.51% weighted-average private placement senior notes \| Senior Notes
Debt Instrument [Line Items]
Weighted-average interest rate			6.51%
Total debt			$ 0	37,000,000
Amount of maturity			$ 37,000,000
5.58% weighted-average private placement senior notes \| Senior Notes
Debt Instrument [Line Items]
Weighted-average interest rate			5.58%
Total debt			$ 0	87,000,000
Amount of maturity			$ 87,000,000
3.65% weighted-average private placement senior notes(1) \| Senior Notes
Debt Instrument [Line Items]
Weighted-average interest rate			3.65%
Total debt			$ 825,000,000	825,000,000
3.65% weighted-average private placement senior notes(1) \| Senior Notes \| Scenario Forecast
Debt Instrument [Line Items]
Amount of maturity	$ 250,000,000	$ 575,000,000
4.375% senior notes due June 1, 2024 \| Senior Notes
Debt Instrument [Line Items]
Weighted-average interest rate			4.375%
Stated percentage			4.375%
Total debt			$ 0	750,000,000
Amount of maturity			$ 750,000,000
3.90% senior notes due May 15, 2027 \| Senior Notes
Debt Instrument [Line Items]
Stated percentage			3.90%
Total debt			$ 750,000,000	750,000,000
4.375% senior notes due March 15, 2029 \| Senior Notes
Debt Instrument [Line Items]
Stated percentage			4.375%
Total debt			$ 500,000,000	$ 500,000,000