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Segment Information (Geographical) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 7,563 $ 7,588
Property, Plant and Equipment, Net 24,376 22,996
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 1,727 1,725
Property, Plant and Equipment, Net 4,878 4,689
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 5,310 5,346
Property, Plant and Equipment, Net 18,588 17,382
Barbados    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 389 384
Property, Plant and Equipment, Net 576 583
The Bahamas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 137 122
Property, Plant and Equipment, Net 334 342
Dominica    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 0 $ 11