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Inventories | 12 Months Ended
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Dec. 31, 2020
Classes Of Inventories [Abstract] |
Inventories | 16. INVENTORIES
As at December 31, | 2020 |  |  | 2019 |
Product |  |  |  |  |  |  |
Refining and Marketing |  | 613 |  |  |  | 874 |
Oil Sands |  | 382 |  |  |  | 570 |
Conventional |  | 1 |  |  |  | 1 |
Parts and Supplies |  | 93 |  |  |  | 87 |
|  | 1,089 |  |  |  | 1,532 |
During the year ended December 31, 2020, approximately $9,996 million of produced and purchased inventory was recorded as an expense (2019 – $14,285 million; 2018 – $15,664 million). As at March 31, 2020, the Company recorded $588 million in non-cash inventory write-downs of its crude oil blend, condensate and refined product inventory. Subsequently, $547 million of inventory that was written down at the end of March was sold and the loss was realized. For the year ended December 31, 2020, the Company reversed $39 million of the inventory write-downs related to March product inventory that was still on hand due to improved refined product and crude oil prices. As at December 31, 2020, the Company recorded a $6 million write-down in refined product inventory. As at December 31, 2019, the Company recorded a $25 million write-down in refined product inventory. The inventory write-down was realized in 2020.

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