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Regulatory Assets and Liabilities (Regulated Assets) (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Regulatory Assets [Line Items] |  |
Regulatory Assets, Current | $ 595 | $ 339
Regulatory Assets, Long-term | 2,832 | 2,766
Total regulatory assets | 3,427 | 3,105
Deferred income tax regulatory assets |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 1,227 | 1,233
TEC capital cost recovery for early retired assets |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 737 | 671
Storm cost recovery clauses |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 613 | 52
Pension and post-retirement medical plan |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 395 | 364
TEC capital cost recovery for retired Polk Unit 1 components |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 205 | 0
Deferrals related to derivative instruments |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 42 | 88
Cost recovery clauses |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 33 | 151
Environmental remediations |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 29 | 26
Stranded cost recovery |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 27 | 25
NSPI FAM |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | 0 | 395
Other |  |
Regulatory Assets [Line Items] |  |
Total regulatory assets | $ 119 | $ 100

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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