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Other Expense - Other Expense (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Other Income and Expenses [Abstract]        
Foreign exchange loss (gain) on debt and lease liabilities $ 0 $ 46 $ 0 $ (39)
Other foreign exchange losses (gains) 2 (7) 1 (9)
Acquisition-related costs 0 83 0 295
Other 5 2 12 6
Other income $ 7 $ 124 $ 13 $ 253