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EMPLOYEE POST-RETIREMENT BENEFITS - Cash Payments, Changes and Balance Sheet Presentation (Details) - CAD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee post-retirement benefits        
Expected average remaining life expectancy of former employees over which past service costs are amortized   11 years 12 years 12 years
Expense for savings plan and DC Plans   $ 61 $ 59 $ 42
Defined Benefits, Contribution And Other Postretirement Plan Contributions [Abstract]        
Savings and DC Plans   61 59 42
Total cash contributions   205 185 $ 212
Reduction for settlement and curtailment   27    
Change in Plan Assets        
Plan assets at fair value – beginning of year   3,697    
Plan assets at fair value – end of year $ 3,697 4,099 3,697  
Amounts recognized in the Balance Sheet        
Intangible and other assets (Note 13) 192 162 192  
Other long-term liabilities (Note 16) (569) $ (540) $ (569)  
Pension Benefit Plans        
Employee post-retirement benefits        
Consecutive period of employment for highest average earnings   5 years 3 years  
Expected average remaining service life of employees over which past service costs are amortized   9 years 9 years 9 years
Defined Benefits, Contribution And Other Postretirement Plan Contributions [Abstract]        
DB Plans and Other post-retirement benefit plans   $ 122 $ 103 $ 163
Total amount outstanding under letters of credit 17 12 17  
Change in Benefit Obligation        
Benefit obligation – beginning of year   3,653 3,646  
Service cost   126 121  
Interest cost   142 134  
Employee contributions   5 5  
Benefits paid   (213) (177)  
Actuarial loss/(gain)   394 (92)  
Settlement   0 (71)  
Foreign exchange rate changes   (49) 87  
Benefit obligation – end of year 3,653 4,058 3,653 3,646
Change in Plan Assets        
Plan assets at fair value – beginning of year   3,321 3,451  
Actual return on plan assets   505 (73)  
Employer contributions   122 103  
Employee contributions   5 5  
Benefits paid   (212) (176)  
Settlement   0 (71)  
Foreign exchange rate changes   (48) 82  
Plan assets at fair value – end of year 3,321 3,693 3,321 3,451
Funded Status – Plan Deficit (332) (365) (332)  
Amounts recognized in the Balance Sheet        
Intangible and other assets (Note 13) 0 0 0  
Accounts payable and other (1) 0 (1)  
Other long-term liabilities (Note 16) (331) (365) (331)  
Net (332) (365) (332)  
Other Post-Retirement Benefit Plans        
Defined Benefits, Contribution And Other Postretirement Plan Contributions [Abstract]        
DB Plans and Other post-retirement benefit plans   22 23 7
Change in Benefit Obligation        
Benefit obligation – beginning of year   430 375  
Service cost   5 4  
Interest cost   17 14  
Employee contributions   0 0  
Benefits paid   (24) (23)  
Actuarial loss/(gain)   13 43  
Settlement   0 0  
Foreign exchange rate changes   (14) 17  
Benefit obligation – end of year 430 427 430 375
Change in Plan Assets        
Plan assets at fair value – beginning of year   376 365  
Actual return on plan assets   52 (15)  
Employer contributions   22 23  
Employee contributions   0 0  
Benefits paid   (24) (27)  
Settlement   0 0  
Foreign exchange rate changes   (20) 30  
Plan assets at fair value – end of year 376 406 376 365
Funded Status – Plan Deficit (54) (21) (54)  
Amounts recognized in the Balance Sheet        
Intangible and other assets (Note 13) 192 162 192  
Accounts payable and other (8) (8) (8)  
Other long-term liabilities (Note 16) (238) (175) (238)  
Net (54) (21) (54)  
Canadian | Pension Benefit Plans        
Defined Benefits, Contribution And Other Postretirement Plan Contributions [Abstract]        
Letter of credit to the DB Plan   12 $ 17 27
Total amount outstanding under letters of credit   $ 289    
U.S. | Pension Benefit Plans        
Defined Benefits, Contribution And Other Postretirement Plan Contributions [Abstract]        
Reduction for settlement and curtailment 4     3
Net periodic benefit cost, settlement charge $ 4     $ 2