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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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Amount of loss (recovery of loss) related to a plant abandonment.

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Remaining recovery period of regulatory assets for which no return on investment during recovery period is provided, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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A noncash adjustment to the provision established for storm damage by an oil, gas, or utility company.

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