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Segment Information (Geographical) (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues, Total $ 6,524 $ 6,226
Noncurrent Assets 18,712 16,995
CA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues, Total 1,520 1,464
Noncurrent Assets 4,128 3,995
UNITED STATES    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues, Total 4,537 4,328
Noncurrent Assets 13,739 12,257
BARBADOS    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues, Total 319 280
Noncurrent Assets 446 408
BAHAMAS    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues, Total 121 119
Noncurrent Assets 315 276
DOMINICA    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues, Total 27 35
Noncurrent Assets $ 84 $ 59