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Income taxes - Disclosure of Current and Deferred Taxes (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
OTHER COMPREHENSIVE INCOME    
Current taxes $ 0 $ 0
Deferred taxes (73) (677)
Total income taxes (expense) recovery (73) (677)
DEFICIT    
Current taxes 3 1
Deficit (7) 30
Total income taxes (expense) recovery $ (4) $ 31