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Inventories | 12 Months Ended
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Dec. 31, 2020
Inventories [Abstract] |
Inventories | Inventories
(CAD$ in millions) |  | December 31, 2020 |  | December 31, 2019
Supplies |  | $ | 757 |  |  | $ | 721 |
Raw materials |  | 197 |  |  | 271 |
Work in process |  | 592 |  |  | 491 |
Finished products |  | 410 |  |  | 573 |
|  | 1,956 |  |  | 2,056 |
Less long-term portion (Note 14) |  | (84) |  |  | (75) |
|  | $ | 1,872 |  |  | $ | 1,981 |
Cost of sales of $7.6 billion (2019 – $8.6 billion) includes $7.0 billion (2019 – $7.9 billion) of inventories recognized as an expense during the year. Total inventories held at net realizable value amounted to $75 million at December 31, 2020 (December 31, 2019 – $95 million). Total inventory write-downs in 2020 were $134 million (2019 – $60 million) and 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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