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v3.25.1

Pension and other post-retirement benefits (Percentages of the total fair value of assets) (Details) - Pension Plans [Member] - CAD ($) | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of fair value of plan [line items] |  |
The percentages of the total fair value of assets | 100.00% | 100.00%
Description of the refundable tax account held by CRA | equal to half of the sum of the realized investment income plus employer contributions less half of the benefits paid by the plan |
Related Parties [member] |  |
Disclosure of fair value of plan [line items] |  |
Defined benefit plan assets | $ 0 | $ 0
Canadian Equity Securities [Member] |  |
Disclosure of fair value of plan [line items] |  |
The percentages of the total fair value of assets | 8.00% | 7.00%
US Equity Securities [Member] |  |
Disclosure of fair value of plan [line items] |  |
The percentages of the total fair value of assets | 14.00% | 12.00%
Global Equity Securities [Member] |  |
Disclosure of fair value of plan [line items] |  |
The percentages of the total fair value of assets | 6.00% | 6.00%
Canadian Fixed Income [Member] |  |
Disclosure of fair value of plan [line items] |  |
The percentages of the total fair value of assets | 35.00% | 31.00%
Other [Member] |  |
Disclosure of fair value of plan [line items] |  |
The percentages of the total fair value of assets | 37.00% | 44.00%

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- Definition The description of the refundable tax account held by Canada Revenue Agency. + References No definition available. + Details
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Namespace Prefix: | ccj_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of the total fair value of assets in the pension plans for each asset category. + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_140_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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