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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Public Utility, Property, Plant and Equipment [Line Items] |  |
Debt component of AFUDC | $ 74 | $ 56
Property, plant and equipment, weighted average composite depreciation rate | 2.70% | 2.60%
Property, plant and equipment, generation remaining service life | 22 years | 23 years
Property, plant and equipment, other weighted average remaining service life | 13 years | 10 years
Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, distribution weighted average remaining service life | 32 years | 31 years
Gas Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, distribution weighted average remaining service life | 37 years | 38 years
Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, transmission weighted average remaining service life | 42 years | 41 years
Gas Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, transmission weighted average remaining service life | 35 years | 36 years
Minimum |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, straight line depreciation rate | 0.50% | 0.50%
Property, plant and equipment, generation service life | 2 years | 2 years
Property, plant and equipment, other service life | 3 years | 3 years
Minimum | Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, distribution service life | 5 years | 5 years
Minimum | Gas Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, distribution service life | 18 years | 18 years
Minimum | Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, transmission service life | 20 years | 20 years
Minimum | Gas Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, transmission service life | 10 years | 10 years
Maximum |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, straight line depreciation rate | 33.00% | 35.00%
Property, plant and equipment, generation service life | 95 years | 95 years
Property, plant and equipment, other service life | 80 years | 80 years
Maximum | Electric Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, distribution service life | 80 years | 80 years
Maximum | Gas Distribution |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, distribution service life | 83 years | 95 years
Maximum | Electric Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, transmission service life | 85 years | 90 years
Maximum | Gas Transmission |  |
Public Utility, Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, transmission service life | 80 years | 85 years

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- Definition Amount capitalized of allowance for funds used during construction. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478698/980-835-25-1 + Details
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