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PENSION AND OTHER POSTRETIREMENT BENEFITS - AMOUNT RECOGNIZED IN EXCESS OF ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Canada    
Pension and Other Postretirement Benefit Disclosures    
Accumulated benefit obligation $ 440 $ 4,094
Fair value of plan assets 247 3,621
Canada | OPEB    
Pension and Other Postretirement Benefit Disclosures    
Accumulated benefit obligation 274 321
Fair value of plan assets 0 0
Projected benefit obligation 1,272 4,434
Fair value of plan assets 1,020 3,621
United States    
Pension and Other Postretirement Benefit Disclosures    
Accumulated benefit obligation 115 1,207
Fair value of plan assets 0 1,062
United States | OPEB    
Pension and Other Postretirement Benefit Disclosures    
Accumulated benefit obligation 94 191
Fair value of plan assets 51 106
Projected benefit obligation 121 1,243
Fair value of plan assets $ 0 $ 1,062