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Leases - Leases Income Statement (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Leases [Abstract]    
Interest expense on lease liabilities $ 165 $ 177
Variable lease payment expenses not included in the measurement of lease liabilities 133 122
Expenses for leases of low value assets 60 60
Expenses for short-term leases $ 27 $ 31