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Leases (Future minimum lease payments under non-cancellable operating leases) (Details)
$ in Millions
Dec. 31, 2019
CAD ($)
Future minimum lease payments under non-cancellable operating leases for each of the next five years and in aggregate thereafter  
2020 $ 8
2021 8
2022 7
2023 6
2024 5
Thereafter 102
Minimum lease payments, Total 136
Less imputed interest (70)
Total $ 66