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PROPERTY, PLANT AND EQUIPMENT - Summary of Property, Plant and Equipment (Details) - CAD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Property, Plant  and Equipment $ 43,894 $ 41,320
Accumulated Depreciation 15,042 14,340
Construction in Progress 2,598 2,113
Total 31,450 29,093
Transmission    
Property, Plant and Equipment [Line Items]    
Property, Plant  and Equipment 23,618 22,359
Accumulated Depreciation 7,437 7,100
Construction in Progress 2,191 1,616
Total 18,372 16,875
Distribution    
Property, Plant and Equipment [Line Items]    
Property, Plant  and Equipment 15,338 14,335
Accumulated Depreciation 5,053 4,813
Construction in Progress 304 318
Total 10,589 9,840
Communication    
Property, Plant and Equipment [Line Items]    
Property, Plant  and Equipment 1,539 1,511
Accumulated Depreciation 1,327 1,242
Construction in Progress 57 45
Total 269 314
Administration and service    
Property, Plant and Equipment [Line Items]    
Property, Plant  and Equipment 2,578 2,382
Accumulated Depreciation 1,101 1,063
Construction in Progress 46 134
Total 1,523 1,453
Easements    
Property, Plant and Equipment [Line Items]    
Property, Plant  and Equipment 821 733
Accumulated Depreciation 124 122
Construction in Progress 0 0
Total $ 697 $ 611