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Segment Disclosures (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment reporting information |  |  |  |
Asset Retirement Obligation, Period Increase (Decrease) | $ (4) |  |  |
Asset impairment |  | $ 76 | $ 0 | $ 0
Number of reportable segments not disclosed flag |  | reportable segments |  |
Point Lisas Nitrogen Limited (PLNL) |  |  |  |
Segment reporting information |  |  |  |
Ownership interest (as a percent) |  | 50.00% |  |

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