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Inventories | 12 Months Ended
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Dec. 31, 2017
Inventories |
Inventories | 17. INVENTORIES
($ millions) |  | Dec 31 2017 |  | Dec 31 2016 |  |
Crude oil |  | 1 203 |  | 1 110 |  |
Refined products |  | 1 268 |  | 1 193 |  |
Materials, supplies and merchandise |  | 664 |  | 680 |  |
Energy trading commodity inventories |  | 333 |  | 515 |  |
Reclassified to assets held for sale (notes 36 and 37) |  | — |  | (258 | ) |
|  | 3 468 |  | 3 240 |  |
During 2017, product inventories of $11.6 billion (2016 – $10.1 billion) were recorded as an expense. There was no write-down of crude oil (2016 – $32 million) and no write-down of materials, supplies and merchandise in 2017 (2016 – $26 million). Energy trading commodity inventories are measured at fair value less costs of disposal based on Level 1 and Level 2 fair value inputs.

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