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Segment Information (Geographical) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 7,588 $ 5,765
Property, Plant and Equipment, Net 22,996 20,353
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 1,725 1,566
Property, Plant and Equipment, Net 4,689 4,440
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 5,346 3,754
Property, Plant and Equipment, Net 17,382 14,978
Barbados    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 384 292
Property, Plant and Equipment, Net 583 535
The Bahamas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 122 110
Property, Plant and Equipment, Net 342 322
Dominica    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 11 43
Property, Plant and Equipment, Net $ 0 $ 78