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PENSION AND OTHER POSTRETIREMENT BENEFITS - BENEFIT OBLIGATION, PLAN ASSETS AND FUNDED STATUS (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Canada      
Change in plan assets      
Employer contributions $ 0 $ 4 $ 13
Canada | Pension      
Change in projected benefit obligation      
Accumulated postretirement benefit obligation at beginning of year 4,446 3,997  
Service cost 148 149 149
Interest cost 128 139 130
Participant contributions 31 32  
Actuarial loss 292 423  
Benefits paid (190) (187)  
Plan settlements 0 (99)  
Transfers out 0 (8)  
Foreign currency exchange rate changes 0 0  
Other 0 0  
Accumulated postretirement benefit obligation at end of year 4,855 4,446 3,997
Change in plan assets      
Fair value of plan assets at beginning of year 3,827 3,523  
Actual return on plan assets 288 448  
Employer contributions 121 114  
Participant contributions 31 32  
Benefits paid (190) (187)  
Plan settlements 0 (99)  
Transfers out 0 (4)  
Foreign currency exchange rate changes 0 0  
Other 0 0  
Fair value of plan assets at end of year 4,077 3,827 3,523
Underfunded status at end of year (778) (619)  
Presented as follows:      
Deferred amounts and other assets 35 35  
Accounts payable and other (9) (9)  
Other long-term liabilities (804) (645)  
Amount recognized in balance sheet (778) (619)  
Accumulated benefit obligation 4,500 4,000  
Canada | Supplemental Employee Retirement Plan      
Presented as follows:      
Deferred amounts and other assets 11 10  
Canada | OPEB      
Change in projected benefit obligation      
Accumulated postretirement benefit obligation at beginning of year 293 282  
Service cost 5 5 8
Interest cost 8 10 10
Participant contributions 0 0  
Actuarial loss 21 15  
Benefits paid (6) (6)  
Plan settlements 0 0  
Foreign currency exchange rate changes 0 0  
Other 0 (13)  
Accumulated postretirement benefit obligation at end of year 321 293 282
Change in plan assets      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 6 6  
Participant contributions 0 0  
Benefits paid (6) (6)  
Foreign currency exchange rate changes 0 0  
Other 0 0  
Fair value of plan assets at end of year 0 0 0
Underfunded status at end of year (321) (293)  
Presented as follows:      
Deferred amounts and other assets 0 0  
Accounts payable and other (13) (12)  
Other long-term liabilities (308) (281)  
Amount recognized in balance sheet (321) (293)  
United States      
Change in plan assets      
Employer contributions 27    
United States | Pension      
Change in projected benefit obligation      
Accumulated postretirement benefit obligation at beginning of year 1,230 1,214  
Service cost 44 45 45
Interest cost 31 41 38
Participant contributions 0 0  
Actuarial loss 95 106  
Benefits paid (128) (101)  
Plan settlements 0 (1)  
Transfers out 0 (6)  
Foreign currency exchange rate changes (23) (63)  
Other (6) (5)  
Accumulated postretirement benefit obligation at end of year 1,243 1,230 1,214
Change in plan assets      
Fair value of plan assets at beginning of year 1,104 1,045  
Actual return on plan assets 83 176  
Employer contributions 27 46  
Participant contributions 0 0  
Benefits paid (128) (101)  
Plan settlements 0 (1)  
Transfers out 0 0  
Foreign currency exchange rate changes (18) (56)  
Other (6) (5)  
Fair value of plan assets at end of year 1,062 1,104 1,045
Underfunded status at end of year (181) (126)  
Presented as follows:      
Deferred amounts and other assets 0 0  
Accounts payable and other (3) (4)  
Other long-term liabilities (178) (122)  
Amount recognized in balance sheet (181) (126)  
Accumulated benefit obligation 1,200    
United States | Supplemental Employee Retirement Plan      
Presented as follows:      
Deferred amounts and other assets 59 51  
United States | OPEB      
Change in projected benefit obligation      
Accumulated postretirement benefit obligation at beginning of year 288 305  
Service cost 2 2 3
Interest cost 7 10 10
Participant contributions 4 5  
Actuarial loss 17 7  
Benefits paid (28) (28)  
Plan settlements (33) 0  
Foreign currency exchange rate changes (4) (15)  
Other 1 2  
Accumulated postretirement benefit obligation at end of year 254 288 305
Change in plan assets      
Fair value of plan assets at beginning of year 188 181  
Actual return on plan assets 14 27  
Employer contributions 12 10  
Participant contributions 4 5  
Benefits paid (28) (28)  
Foreign currency exchange rate changes (3) (9)  
Other 1 2  
Fair value of plan assets at end of year 188 188 $ 181
Underfunded status at end of year (66) (100)  
Presented as follows:      
Deferred amounts and other assets 19 0  
Accounts payable and other (6) (8)  
Other long-term liabilities (79) (92)  
Amount recognized in balance sheet $ (66) $ (100)