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STOCK OPTION AND STOCK UNIT PLANS - PSUs and RSUs (Details)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2022
CAD ($)
shares
Dec. 31, 2021
CAD ($)
shares
Dec. 31, 2020
CAD ($)
Stock units, additional disclosures      
Compensation expense | $ $ 260 $ 157 $ 145
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 1.25 1.25 2.00
Number      
Units outstanding at beginning of year (in shares) 3,429    
Units granted (in shares) 1,467    
Units cancelled (in shares) (131)    
Units matured (in shares) (1,700)    
Dividend reinvestment (in shares) 184    
Units outstanding at end of year (in shares) 3,249 3,429  
Weighted Average Remaining Contractual Life (years)      
Units outstanding at end of year 1 year 1 month 6 days    
Aggregate Intrinsic Value      
Units outstanding at end of year | $ $ 261    
Stock units, additional disclosures      
Total amount paid | $ 90 $ 70 $ 14
Compensation expense | $ 169 $ 56 76
Unrecognized compensation expense related to non-vested units granted | $ $ 72    
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 3 years    
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) 2,705    
Units granted (in shares) 1,400    
Units cancelled (in shares) (134)    
Units matured (in shares) (602)    
Dividend reinvestment (in shares) 196    
Units outstanding at end of year (in shares) 3,565 2,705  
Weighted Average Remaining Contractual Life (years)      
Units outstanding at end of year 1 year    
Aggregate Intrinsic Value      
Units outstanding at end of year | $ $ 185    
Stock units, additional disclosures      
Total amount paid | $ 32 $ 72 27
Compensation expense | $ 76 $ 85 $ 44
Unrecognized compensation expense related to non-vested units granted | $ $ 35    
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