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Inventories | 12 Months Ended
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Dec. 31, 2017
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Inventories |
11. | Inventories
(CAD$ in millions) |  | December 31, 2017 |  |  | December 31, 2016 |
Supplies |  | $ | 563 |  |  | $ | 586 |
Raw materials |  |  | 223 |  |  |  | 204 |
Work in-process |  |  | 529 |  |  |  | 521 |
Finished products |  |  | 430 |  |  |  | 449 |
|  |  | 1,745 |  |  |  | 1,760 |
Less long-term portion (Note 13) |  |  | (108 | ) |  |  | (87 | )
|  | $ | 1,637 |  |  | $ | 1,673 |
Cost of sales of $7.4 billion (2016 — $6.9 billion) include $6.7 billion (2016 — $6.3 billion) of inventories recognized as an expense during the year. Total inventories held at net realizable value amounted to $17 million at December 31, 2017 (December 31, 2016 — $53 million). Total inventory write-downs in 2017 were $20 million (2016 — $7 million) and were included as part of cost of sales. Total reversals of inventory write-downs previously recorded were $30 million in 2017 (2016 — $23 million) as a result of an increase in net realizable value primarily relating to commodity price increases. These reversals were included as part of cost of sales. Long-term inventories consist of ore stockpiles and other in-process materials that are not expected to be processed within one year.

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