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INVENTORIES (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
INVENTORIES |  |
Crude oil | $ 1,429 | $ 1,689
Refined products | 1,322 | 1,290
Energy trading commodity inventories | 866 | 782
Total current inventories | 3,617 | 3,761
Write-downs (reversals of write-downs) of inventories |  |
Crude oil held for trading purpose | 154 | 210
Product inventory expensed | $ 9,400 | $ 13,300

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