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Other expense (income) (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other Income and Expenses [Abstract]      
Foreign exchange gain on debt and lease liabilities $ 0 $ (7) $ (14)
Other foreign exchange gains 0 (4) (1)
Acquisition-related costs 0 247 0
Other 17 1 8
Other expense (income) $ 17 $ 237 $ (7)