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Post-employment benefit plans - Disclosure of Contributions to Post-Employment Benefit Plans (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Disclosure of defined benefit plans [line items] |  |
Contributions, defined benefit plan | $ (5) | $ (4)
Estimated of contributions expected to be paid to plan for next annual reporting period, defined contribution plan | 5 |
DB pension |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan | 30 |
OPEBs |  |
Disclosure of defined benefit plans [line items] |  |
Estimate of contributions expected to be paid to plan for next annual reporting period, defined benefit plan | 60 |
Plan assets | DB pension |  |
Disclosure of defined benefit plans [line items] |  |
Contributions, defined benefit plan | (44) | (48)
Plan assets | OPEBs |  |
Disclosure of defined benefit plans [line items] |  |
Contributions, defined benefit plan | $ (59) | $ (61)

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- Definition Decrease (increase) in net defined benefit liability (asset) resulting from resulting from contributions to plan by employer, cash flow impact + References No definition available. + Details
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- Definition Defined Contribution Plans, Estimate Of Contributions Expected To Be Paid To Plan For Next Annual Reporting Period + 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 estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_147_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 211 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_211_b&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 211 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_211_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Details
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- Details
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- Details
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