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Inventories | 12 Months Ended
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Dec. 31, 2024
Classes of current inventories [abstract] |
Inventories | Note 7. Inventories Inventories consisted of the following:
|  | December 31, 2024 |  |  | December 31, 2023 |  |  | January 1, 2023 |
Direct materials |  | $ | 85 |  |  | $ | 70 |  |  | $ | 79 |
Repair and distribution parts |  |  | 94 |  |  |  | 115 |  |  |  | 101 |
Work-in-progress |  |  | 62 |  |  |  | 90 |  |  |  | 73 |
Equipment |  |  | 17 |  |  |  | 19 |  |  |  | 20 |
Total inventories |  | $ | 258 |  |  | $ | 294 |  |  | $ | 273 |
|  | December 31, 2024 |  |  | December 31, 2023 |  |  | January 1, 2023 |
Work-in-progress related to finance leases |  | $ | 35 |  |  | $ | - |  |  | $ | 31 |
The amount of inventory and overhead costs recognized as expense and included in COGS during the year ended December 31, 2024, was $1,910 million (December 31, 2023 – $1,886 million). COGS is made up of direct materials, direct labour, depreciation on manufacturing assets, post-manufacturing expenses, and overhead. COGS also includes inventory write-downs pertaining to obsolescence and aging, and recoveries of past write-downs upon disposition. The net change in inventory reserves charged to the consolidated statements of earnings (loss) and included in COGS for the year ended December 31, 2024, was $3 million (December 31, 2023 – less than $1 million). The costs related to the construction of EI assets determined to be finance leases are accounted for as work-in-progress related to finance leases. Once a project is completed and enters service it is reclassified to COGS.

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