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OTHER LONG-TERM LIABILITIES (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Subclassifications of assets, liabilities and equities [abstract]      
Deferred pension liability $ 373 $ 460  
Supplemental executive retirement plan 67 66  
Stock-based compensation 66 66  
Other 40 21  
Total other long-term liabilities $ 546 $ 613 $ 562