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Post-employment benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | $ 2,248 |
Interest on obligations | 108 | $ 51
Actuarial gains (losses) | (835) | 894
Transfers to DC plans | (124) | (57)
Post-employment benefit obligations, December 31 | 1,657 | 2,248
Post-employment benefit assets | 2,935 | 3,559
Post-employment benefit obligations | (1,278) | (1,311)
Experience gains (losses) included in actuarial gains | 734 | (4,729)
Actual return on plan assets | $ 1,898 | $ (3,370)
Actual return on plan assets, percent | 8.80% | (11.60%)
Benefit obligations |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | $ (20,433) | $ (26,001)
Current service cost | (129) | (195)
Interest on obligations | (1,051) | (814)
Actuarial gains (losses) | (1,521) | 5,150
Benefit payments | 1,473 | 1,436
Employee contributions | (8) | (9)
Other | 0 | 0
Post-employment benefit obligations, December 31 | (21,669) | (20,433)
Plan assets |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 23,682 | 28,391
Interest on obligations | 1,212 | 886
Actuarial gains (losses) | 686 | (4,256)
Benefit payments | (1,473) | (1,436)
Employer contributions | 105 | 145
Employee contributions | 8 | 9
Other | 2 | 0
Post-employment benefit obligations, December 31 | 24,098 | 23,682
Plan asset (deficit) |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 3,249 |
Post-employment benefit obligations, December 31 | 2,429 | 3,249
Effect of asset limit |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (980) |
Interest on obligations | (53) | (21)
Post-employment benefit obligations, December 31 | (719) | (980)
DB PENSION PLANS |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 3,059 |
Current service cost | (128) | (193)
Interest on obligations | 149 | 84
Post-employment benefit obligations, December 31 | 2,401 | 3,059
Post-employment benefit assets | 2,935 | 3,559
Post-employment benefit obligations | (534) | (500)
DB PENSION PLANS | Benefit obligations |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (19,295) | (24,544)
Current service cost | (128) | (193)
Interest on obligations | (993) | (770)
Actuarial gains (losses) | (1,572) | 4,856
Benefit payments | 1,401 | 1,366
Employee contributions | (8) | (9)
Other | 0 | (1)
Post-employment benefit obligations, December 31 | (20,595) | (19,295)
DB PENSION PLANS | Plan assets |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 23,355 | 28,040
Interest on obligations | 1,195 | 875
Actuarial gains (losses) | 692 | (4,227)
Benefit payments | (1,401) | (1,366)
Employer contributions | 41 | 81
Employee contributions | 8 | 9
Transfers to DC plans | (124) | (57)
Other | 2 | 0
Post-employment benefit obligations, December 31 | 23,768 | 23,355
DB PENSION PLANS | Plan asset (deficit) |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 4,060 |
Post-employment benefit obligations, December 31 | 3,173 | 4,060
DB PENSION PLANS | Effect of asset limit |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (980) |
Interest on obligations | (53) | (21)
Post-employment benefit obligations, December 31 | (719) | (980)
OPEB PLANS |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (811) |
Current service cost | (1) | (2)
Interest on obligations | (41) | (33)
Post-employment benefit obligations, December 31 | (744) | (811)
Post-employment benefit assets | 0 | 0
Post-employment benefit obligations | (744) | (811)
OPEB PLANS | Benefit obligations |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (1,138) | (1,457)
Current service cost | (1) | (2)
Interest on obligations | (58) | (44)
Actuarial gains (losses) | 51 | 294
Benefit payments | 72 | 70
Employee contributions | 0 | 0
Other | 0 | 1
Post-employment benefit obligations, December 31 | (1,074) | (1,138)
OPEB PLANS | Plan assets |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | 327 | 351
Interest on obligations | 17 | 11
Actuarial gains (losses) | (6) | (29)
Benefit payments | (72) | (70)
Employer contributions | 64 | 64
Employee contributions | 0 | 0
Transfers to DC plans | 0 | 0
Other | 0 | 0
Post-employment benefit obligations, December 31 | 330 | 327
OPEB PLANS | Plan asset (deficit) |  |
Reconciliation of changes in net assets available for benefits [abstract] |  |
Post-employment benefit obligations, January 1 | (811) |
Post-employment benefit obligations, December 31 | (744) | (811)
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 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 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 2023-01-01 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c&doctype=Standard -URIDate 2023-03-23 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_f&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 141 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141&doctype=Standard -URIDate 2023-03-23 + Details
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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 2023-01-01 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_b&doctype=Standard -URIDate 2023-03-23 + 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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_140_a&doctype=Standard -URIDate 2023-03-23 + Details
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