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Leases (Future minimum lease payments under non-cancellable operating leases) (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Future minimum lease payments under non-cancellable operating leases for each of the next five years and in aggregate thereafter    
2021 $ 6  
2022 6  
2023 6  
2024 5  
2025 4  
Thereafter 112  
Minimum lease payments, Total 139  
Less imputed interest (76)  
Total $ 63 $ 66