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Acquisitions - Narrative (Details) - USD ($) $ in Millions			1 Months Ended	2 Months Ended	3 Months Ended
Acquisitions - Narrative (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jan. 27, 2025	Jan. 31, 2025	Mar. 31, 2025	Mar. 31, 2025
Business Acquisition [Line Items]
Transaction cost					$ 13
Avant
Business Acquisition [Line Items]
Asset acquisition, consideration transferred	$ 1,500
Franklin Mountain Energy
Business Acquisition [Line Items]
Total consideration		$ 2,520	$ 2,500
Cash consideration			$ 1,700	$ 1,735
Total shares of Coterra common stock issued (in shares)		28,190,682	28,190,682
Total value of Coterra common stock issued		$ 785	$ 785