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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 |

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