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Net Interest Expense - Disclosure of Components of Net Interest Expense (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]      
Interest on debt $ 164 $ 163 $ 158
Interest on exchangeable debentures 29 29 29
Interest on exchangeable preferred shares 28 28 5
Interest income (24) (11) (10)
Capitalized interest (16) (14) (8)
Interest on lease liabilities 7 7 8
Credit facility fees, bank charges and other interest 27 20 25
Tax shield on tax equity financing (2) (9) 1
Accretion of provisions 49 32 30
Net interest expense $ 262 $ 245 $ 238