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Post-employment benefit plans - Components of Post-Employment Benefit Plans Financing Cost (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items] |  |
Total net return on post-employment benefit plans | $ 66 | $ 108
DB pension |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Total net return on post-employment benefit plans | 99 | 149
OPEBs |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Total net return on post-employment benefit plans | $ (33) | $ (41)

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_b&doctype=Standard -URIDate 2024-03-27 + Details
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