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Property, Plant and Equipment - Schedule of Utility Capital Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Public Utility, Property, Plant and Equipment [Line Items]    
Cost $ 66,078 $ 58,323
Accumulated Depreciation (16,622) (14,938)
Net Book Value 49,456 43,385
Electric Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 15,771 14,352
Accumulated Depreciation (4,078) (3,708)
Net Book Value 11,693 10,644
Gas Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 7,148 6,682
Accumulated Depreciation (1,866) (1,736)
Net Book Value 5,282 4,946
Electric Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 23,084 19,886
Accumulated Depreciation (4,865) (4,267)
Net Book Value 18,219 15,619
Gas Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 2,937 2,751
Accumulated Depreciation (894) (843)
Net Book Value 2,043 1,908
Generation    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 8,056 7,192
Accumulated Depreciation (3,110) (2,739)
Net Book Value 4,946 4,453
Other    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 5,014 4,444
Accumulated Depreciation (1,809) (1,645)
Net Book Value 3,205 2,799
Assets under construction    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 3,578 2,581
Accumulated Depreciation 0 0
Net Book Value 3,578 2,581
Land    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 490 435
Accumulated Depreciation 0 0
Net Book Value $ 490 $ 435