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STOCK OPTION AND STOCK UNIT PLANS - PSUs AND RSUs (Details)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
CAD ($)
shares
Dec. 31, 2019
CAD ($)
shares
Dec. 31, 2018
CAD ($)
Stock units, additional disclosures      
Compensation expense | $ $ 145 $ 117 $ 106
Performance Stock Units (PSUs)      
STOCK OPTION AND STOCK UNIT PLANS      
Performance / maturity period 3 years    
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards 20 days    
Performance multiplier 1.5 1.0 1.8
Number      
Units outstanding at beginning of year (in shares) 2,189    
Units granted (in shares) 1,034    
Units cancelled (in shares) (154)    
Units matured (in shares) (219)    
Dividend reinvestment (in shares) 206    
Units outstanding at end of year (in shares) 3,056 2,189  
Weighted Average Remaining Contractual Life (years)      
Units outstanding at end of year 2 years 2 months 12 days    
Aggregate Intrinsic Value      
Units outstanding at end of year | $ $ 129    
Stock units, additional disclosures      
Total amount paid | $ 14 $ 19 $ 18
Compensation expense | $ 76 $ 40 15
Unrecognized compensation expense related to non-vested units granted | $ $ 46    
Weighted average period over which compensation cost is expected to be recognized 2 years    
Restricted Stock Units (RSU)      
STOCK OPTION AND STOCK UNIT PLANS      
Performance / maturity period 35 months    
Period prior to the maturity of the grant for which weighted average share price is used to calculate cash awards 20 days    
Number      
Units outstanding at beginning of year (in shares) 1,624    
Units granted (in shares) 1,281    
Units cancelled (in shares) (87)    
Units matured (in shares) (561)    
Dividend reinvestment (in shares) 196    
Units outstanding at end of year (in shares) 2,453 1,624  
Weighted Average Remaining Contractual Life (years)      
Units outstanding at end of year 2 years 6 months    
Aggregate Intrinsic Value      
Units outstanding at end of year | $ $ 104    
Stock units, additional disclosures      
Total amount paid | $ 27 $ 34 41
Compensation expense | $ 44 $ 41 $ 32
Unrecognized compensation expense related to non-vested units granted | $ $ 50    
Weighted average period over which compensation cost is expected to be recognized 2 years    
Minimum | Performance Stock Units (PSUs)      
STOCK OPTION AND STOCK UNIT PLANS      
Performance multiplier 0    
Maximum | Performance Stock Units (PSUs)      
STOCK OPTION AND STOCK UNIT PLANS      
Performance multiplier 2