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RIGHT-OF-USE ASSETS AND LEASES - Other Lease Related Items (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
RIGHT-OF-USE ASSETS AND LEASES    
Short-term lease expense $ 181 $ 236
Variable lease expense 39 45
Leases with residual value guarantees 0 0
Cash outflow for leases $ 501 $ 464