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Net Interest Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Analysis of income and expenses [Line Items]      
Interest on debt $ 158 $ 161 $ 184
Interest on exchangeable securities 34 20 0
Interest income (10) (13) (11)
Capitalized interest (8) (6) (2)
Loss on redemption of bonds (Note 24) 0 0 24
Interest expense on lease liabilities 8 4 3
Credit facility fees, bank charges and other interest 18 15 13
Tax shield on tax equity financing 1 (35) 0
Interest on Line Loss Rule Proceeding 5 0 0
Other 2 10 15
Accretion of provisions 30 23 24
Net interest expense 238 179 250
Project level financing that is no longer practicable      
Analysis of income and expenses [Line Items]      
Net interest expense     (5)
IFRS 15      
Analysis of income and expenses [Line Items]      
Net interest expense $ 0 $ (5) $ (7)