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Property, Plant and Equipment - Schedule of Utility Capital Assets (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]    
Cost $ 58,323 $ 56,167
Accumulated Depreciation (14,938) (14,504)
Net Book Value 43,385 41,663
Electric Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 14,352 13,650
Accumulated Depreciation (3,708) (3,715)
Net Book Value 10,644 9,935
Gas Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 6,682 6,396
Accumulated Depreciation (1,736) (1,626)
Net Book Value 4,946 4,770
Electric Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 19,886 19,056
Accumulated Depreciation (4,267) (4,074)
Net Book Value 15,619 14,982
Gas Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 2,751 2,600
Accumulated Depreciation (843) (800)
Net Book Value 1,908 1,800
Generation    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 7,192 7,173
Accumulated Depreciation (2,739) (2,679)
Net Book Value 4,453 4,494
Other    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 4,444 4,803
Accumulated Depreciation (1,645) (1,610)
Net Book Value 2,799 3,193
Assets under construction    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 2,581 2,094
Accumulated Depreciation 0 0
Net Book Value 2,581 2,094
Land    
Public Utility, Property, Plant and Equipment [Line Items]    
Cost 435 395
Accumulated Depreciation 0 0
Net Book Value $ 435 $ 395