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PENSIONS AND OTHER POST RETIREMENT BENEFITS - Investment Objectives (Details) - Defined benefits pension plans - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension and other PostRetirement Benefits,      
Employer contributions   $ 132 $ 157
Contribution deposited in solvency reserve account   $ 1 $ 2
Expected cash contributions $ 62    
Equities      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   50.00% 50.00%
Equities | Canada      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   11.00% 12.00%
Equities | United States      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   19.00% 19.00%
Equities | Foreign      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   20.00% 19.00%
Fixed income | Canada      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   38.00% 41.00%
Real estate      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   100.00% 100.00%
Real estate | Canada      
Pension and other PostRetirement Benefits,      
Plan asset allocation percentage   12.00% 9.00%