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Inventories (Details) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Inventories |  |
Crude oil | CAD 1,203.0 | CAD 1,110.0
Refined products | 1,268.0 | 1,193.0
Materials, supplies and merchandise | 664.0 | 680.0
Energy trading commodity inventories | 333.0 | 515.0
Reclassified to assets held for sale |  | (258.0)
Total current inventories | 3,468.0 | 3,240.0
Write-downs (reversals of write-downs) of inventories |  |
Product inventory write-down | 11,600.0 | 10,100.0
Crude oil inventory write-down | 0.0 | 32.0
Materials, supplies and merchandise inventory write-down | CAD 0.0 | CAD 26.0

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