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INVENTORIES (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
INVENTORIES    
Crude oil $ 1,689 $ 1,424
Refined products 1,290 1,033
Energy trading commodity inventories 782 702
Total current inventories 3,761 3,159
Write-downs (reversals of write-downs) of inventories    
Crude oil held for trading purpose 210 247
Product inventory expensed $ 13,300 $ 14,800