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CORPORATE RESTRUCTURING COSTS (Details)
$ in Millions
Dec. 31, 2019
CAD ($)
Restructuring Cost and Reserve [Line Items]  
Cumulative recoverable restructuring costs $ 158
Employee Severance  
Restructuring Cost and Reserve [Line Items]  
Cumulative restructuring costs incurred 86
Lease Commitments  
Restructuring Cost and Reserve [Line Items]  
Cumulative restructuring costs incurred $ 61