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Segment Information (Geographical) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 7,200 $ 7,563
Property, Plant and Equipment, Net 26,168 24,376
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 4,712 5,310
Property, Plant and Equipment, Net 20,084 18,588
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 1,922 1,727
Property, Plant and Equipment, Net 5,068 4,878
Barbados    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 427 389
Property, Plant and Equipment, Net 645 576
The Bahamas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 139 137
Property, Plant and Equipment, Net $ 371 $ 334