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Segment Information (Geographical) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 5,506 $ 6,111
Property, Plant and Equipment, Net 19,535 18,167
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 1,569 1,497
Property, Plant and Equipment, Net 4,304 4,248
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 3,522 4,140
Property, Plant and Equipment, Net 14,353 13,095
Barbados    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 263 320
Property, Plant and Equipment, Net 510 462
The Bahamas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 112 112
Property, Plant and Equipment, Net 289 282
Dominica    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 40 42
Property, Plant and Equipment, Net $ 79 $ 80