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OTHER LONG-TERM LIABILITIES (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]      
Deferred pension liability $ 465   $ 373
Supplemental executive retirement plan 73   67
Stock-based compensation 47   66
Other 29   40
Total other long-term liabilities $ 614 $ 546 $ 546