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Income taxes - Disclosure of Current and Deferred Taxes (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
OTHER COMPREHENSIVE (INCOME) LOSS    
Current taxes $ 0 $ 0
Deferred taxes (677) (172)
Total income taxes (expense) recovery (677) (172)
DEFICIT    
Current taxes 1 14
Deficit 30 (20)
Total income taxes (expense) recovery $ 31 $ (6)