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Net Interest Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expenses [Line Items]      
Interest on debt $ 184 $ 218 $ 218
Interest income (11) (7) (2)
Capitalized interest (Note 17) (2) (9) (16)
Loss on redemption of bonds (Note 22) 24 6 1
Interest on finance lease obligations 3 3 3
Credit facility fees, bank charges and other interest 13 18 19
Keephills 1 outage interest (reversals) (Note 4(P)) 0 0 (10)
Other 15 (3) (4)
Accretion of provisions (Note 21) 24 21 20
Net interest expense 250 $ 247 $ 229
Project level financing that is no longer practicable      
Analysis of income and expenses [Line Items]      
Other 5    
IFRS 15      
Analysis of income and expenses [Line Items]      
Other $ 7