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Regulatory Assets and Liabilities - Assets and Liabilities (Narrative) (Details) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) | Dec. 31, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CAD ($)
TEC capital cost recovery for retired Polk Unit 1 components |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Recovery Period |  |  | 11 years | 11 years |
GBPC | Steam turbine |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities, Property, Plant and Equipment, Amount of Loss (Recovery) on Plant Abandonment |  |  |  | $ 21 |
NSPI |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Storm cost |  |  | $ 10 |  | $ 10
NSPI | Forecast |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Storm cost |  | $ 10 |  |  |
Tampa Electric |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Storm cost | $ 119 |  |  |  |
Recovery Period |  |  | 15 years | 15 years |

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