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Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 27, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Cash dividends on common stock (in dollars per share) |  | $ 0.22 | $ 0.21 |  |
Common stock retirements (in shares) |  |  |  | 2,000,000 |
Common stock retirements |  |  |  | $ 47 |
Stock repurchase program |  |  |  | $ 1,100 |
Previous Share Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Common stock retirements (in shares) |  |  |  |  | 15,000,000
Common stock retirements |  |  |  |  | $ 404
Franklin Mountain Energy |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Total shares of Coterra common stock issued (in shares) | 28,190,682 |  |  |  |
Total value of Coterra common stock issued | $ 785 |  |  |  |

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