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Segment Information (Geographical) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 6,111 $ 6,524
Property, Plant and Equipment, Net 18,167 18,712
Canada    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 1,497 1,520
Property, Plant and Equipment, Net 4,248 4,128
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 4,140 4,537
Property, Plant and Equipment, Net 13,095 13,739
Barbados    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 320 319
Property, Plant and Equipment, Net 462 446
The Bahamas    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 112 121
Property, Plant and Equipment, Net 282 315
Dominica    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 42 27
Property, Plant and Equipment, Net $ 80 $ 84