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Regulatory Assets and Liabilities (Regulated Liabilities) (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
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

X

- 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

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+ References

No definition available.

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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

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- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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