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CORPORATE RESTRUCTURING COSTS - Schedule of Change In Restructuring Liability (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restructuring Reserve [Roll Forward]    
Restructuring liability as at the beginning of period $ 81 $ 62
Restructuring charges   42
Accretion expense 2 1
Cash payments (14) (24)
Restructuring liability as at the end of period 69 81
Recoverable restructuring costs incurred   21
Employee Severance    
Restructuring Reserve [Roll Forward]    
Restructuring liability as at the beginning of period 0 9
Restructuring charges   0
Accretion expense 0 0
Cash payments 0 (9)
Restructuring liability as at the end of period 0 0
Lease Commitments    
Restructuring Reserve [Roll Forward]    
Restructuring liability as at the beginning of period 81 53
Restructuring charges   42
Accretion expense 2 1
Cash payments (14) (15)
Restructuring liability as at the end of period $ 69 $ 81