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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2025
Jan. 31, 2025
Dec. 31, 2024
Avant      
Significant Acquisitions and Disposals      
Payments for asset acquisitions     $ 109
Avant | Subsequent Event      
Significant Acquisitions and Disposals      
Asset acquisition, consideration transferred $ 1,500    
Franklin Mountain Energy      
Significant Acquisitions and Disposals      
Escrow deposit     $ 125
Franklin Mountain Energy | Subsequent Event      
Significant Acquisitions and Disposals      
Business combination, consideration transferred   $ 2,500  
Payments to acquire business, gross   $ 1,700  
Total shares of Coterra common stock issued (in shares)   28,190,682  
Business combination, consideration transferred, equity interests issued and issuable   $ 785