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Regulatory Assets and Liabilities (Regulated Liabilities) (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Regulatory Liabilities [Line Items] |  |
Regulatory Liability, Current | $ 262 | $ 168
Regulatory Liability, Long-term | 1,618 | 1,604
Total regulatory liabilities | 1,880 | 1,772
Deferred income tax regulatory liabilities |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 828 | 830
Accumulated reserve - COR |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 733 | 849
Cost recovery clauses |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 121 | 32
NSPI FAM | Regulated |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 56 | 0
Deferrals related to derivative instruments |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 44 | 17
BLPC Self-insurance fund ("SIF") |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | 32 | 29
Other |  |
Regulatory Liabilities [Line Items] |  |
Total regulatory liabilities | $ 66 | $ 15

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- Definition The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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- Definition The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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