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OTHER LONG-TERM LIABILITIES (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]    
Deferred pension liability $ 590 $ 465
Supplemental executive retirement plan 92 73
Stock-based compensation 39 47
Derivative instruments 318 90
Contract liabilities 69 0
Other 41 29
Total other long-term liabilities $ 1,149 $ 704