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Mergers, Acquisitions, and Divestitures - Narrative (Details) a in Thousands, $ in Millions			3 Months Ended
	Apr. 30, 2026 USD ($) a	Jan. 30, 2026 shares	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Asset Acquisition [Line Items]
Properties held for sale, net			$ 666		$ 0
Income (loss) before income taxes			(410)	$ 232
South Texas Divestiture | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Asset Acquisition [Line Items]
Properties held for sale, net			666
Disposal Group, Including Discontinued Operation, Asset Retirement Obligation			45
Income (loss) before income taxes			46	$ 44
South Texas Divestiture | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsequent Event
Asset Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Net Acres Divested | a	61
Proceeds from Divestiture of Businesses	$ 900
Civitas Resources Merger
Asset Acquisition [Line Items]
Business Combination, Effective Date of Acquisition		Jan. 30, 2026
Business Combination, Voting Equity Interest Acquired, Percentage		100.00%
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Entity Shares Issued Per Acquiree Share | shares		1.45
Shares of common stock issued (in shares) | shares		123,715,771
Business Combination, Acquisition-Related Cost, Expense			17
Business Combination, Acquiree's Revenue since Acquisition Date, Actual			$ 736

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