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Leases - Leases Income Statement (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Interest expense on lease liabilities $ 199 $ 213
Variable lease payment expenses not included in the measurement of lease liabilities 150 148
Expenses for leases of low value assets 60 58
Expenses for short-term leases $ 31 $ 30