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Post-employment benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | $ 2,374 |
Interest on obligations | 102 | $ 66
Actuarial gains | 881 | 984
Post-employment benefit obligations, December 31 | 3,159 | 2,374
Post-employment benefit assets | 4,310 | 3,578
Post-employment benefit obligations | (1,151) | (1,204)
Experience gains included in actuarial gains | 391 | 809
Actual return on plan assets | $ 1,529 | $ 1,848
Actual return on plan assets, percent | 6.40% | 8.10%
Benefit obligations |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | $ (21,188) | $ (21,669)
Current service cost | (126) | (135)
Interest on obligations | (972) | (976)
Actuarial gains | 473 | 214
Benefit payments | 1,473 | 1,419
Employee contributions | (7) | (8)
Business combinations | (224) | (33)
Other | (2) | 0
Post-employment benefit obligations, December 31 | (20,573) | (21,188)
Plan assets |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 24,558 | 24,098
Expected return on plan assets | 1,121 | 1,078
Actuarial gains | 408 | 770
Benefit payments | (1,473) | (1,419)
Employer contributions | 109 | 109
Employee contributions | 7 | 8
Transfers to DC plans | (127) | (132)
Business combinations | 201 | 47
Refundable tax | (6) | 0
Other | (1) | (1)
Post-employment benefit obligations, December 31 | 24,797 | 24,558
Plan asset (deficit) |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 3,370 |
Post-employment benefit obligations, December 31 | 4,224 | 3,370
Effect of asset limit |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (960) |
Interest on obligations | (47) | (36)
Post-employment benefit obligations, December 31 | (1,018) | (960)
DB pension plans |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 3,058 |
Current service cost | (125) | (134)
Interest on obligations | 133 | 99
Post-employment benefit obligations, December 31 | 3,816 | 3,058
Post-employment benefit assets | 4,310 | 3,578
Post-employment benefit obligations | (494) | (520)
DB pension plans | Benefit obligations |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (20,134) | (20,595)
Current service cost | (125) | (134)
Interest on obligations | (924) | (927)
Actuarial gains | 437 | 214
Benefit payments | 1,404 | 1,349
Employee contributions | (7) | (8)
Business combinations | (181) | (33)
Other | (2) | 0
Post-employment benefit obligations, December 31 | (19,532) | (20,134)
DB pension plans | Plan assets |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 24,188 | 23,768
Expected return on plan assets | 1,104 | 1,062
Actuarial gains | 401 | 737
Benefit payments | (1,404) | (1,349)
Employer contributions | 50 | 48
Employee contributions | 7 | 8
Transfers to DC plans | (127) | (132)
Business combinations | 201 | 47
Refundable tax | (6) | 0
Other | (1) | (1)
Post-employment benefit obligations, December 31 | 24,413 | 24,188
DB pension plans | Plan asset (deficit) |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 4,054 |
Post-employment benefit obligations, December 31 | 4,881 | 4,054
DB pension plans | Effect of asset limit |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (960) |
Interest on obligations | (47) | (36)
Post-employment benefit obligations, December 31 | (1,018) | (960)
OPEB plans |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (684) |
Current service cost | (1) | (1)
Interest on obligations | (31) | (33)
Post-employment benefit obligations, December 31 | (657) | (684)
Post-employment benefit assets | 0 | 0
Post-employment benefit obligations | (657) | (684)
OPEB plans | Benefit obligations |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (1,054) | (1,074)
Current service cost | (1) | (1)
Interest on obligations | (48) | (49)
Actuarial gains | 36 | 0
Benefit payments | 69 | 70
Employee contributions | 0 | 0
Business combinations | (43) | 0
Other | 0 | 0
Post-employment benefit obligations, December 31 | (1,041) | (1,054)
OPEB plans | Plan assets |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 370 | 330
Expected return on plan assets | 17 | 16
Actuarial gains | 7 | 33
Benefit payments | (69) | (70)
Employer contributions | 59 | 61
Employee contributions | 0 | 0
Transfers to DC plans | 0 | 0
Business combinations | 0 | 0
Refundable tax | 0 | 0
Other | 0 | 0
Post-employment benefit obligations, December 31 | 384 | 370
OPEB plans | Plan asset (deficit) |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (684) |
Post-employment benefit obligations, December 31 | (657) | (684)
OPEB plans | Effect of asset limit |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 0 |
Interest on obligations | 0 | 0
Post-employment benefit obligations, December 31 | $ 0 | $ 0

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- Definition Expected Return On Plan Assets, Including Amounts Included In Net Interest On The Net Defined Benefit Liability (Asset) + References No definition available. + Details
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- Definition Increase (Decrease) In Net Defined Benefit Liability (Asset) Resulting From Refundable Tax + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_f&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_f&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 207 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_a&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 207 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Total for all business combinations [member]; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_h&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141&doctype=Standard -URIDate 2025-03-27 + 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 2025-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_140_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&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 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 + Details
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