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Post-employment benefit plans - Components of Post-Employment Benefit (Obligations) Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | $ 1,738 |
Interest on obligations | 51 | $ (20)
Actuarial gains (losses) | 894 | 3,020
Transfers to DC plans | (57) | 0
Post-employment benefit obligations, December 31 | 2,248 | 1,738
Post-employment benefit assets | 3,559 | 3,472
Post-employment benefit obligations | (1,311) | (1,734)
Experience gains (losses) included in actuarial gains | (4,729) | 907
Actual return on plan assets | $ (3,370) | $ 1,486
Actual return on plan assets, percent | (11.60%) | 5.70%
Benefit obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | $ (26,001) | $ (28,749)
Current service cost | (195) | (225)
Interest on obligations | (814) | (736)
Actuarial gains (losses) | 5,150 | 2,250
Benefit payments | 1,436 | 1,467
Employee contributions | (9) | (9)
Other | 0 | 1
Post-employment benefit obligations, December 31 | (20,433) | (26,001)
Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 28,391 | 28,129
Interest on obligations | 886 | 716
Actuarial gains (losses) | (4,256) | 770
Benefit payments | (1,436) | (1,467)
Employer contributions | 145 | 233
Employee contributions | 9 | 9
Other | 0 | 1
Post-employment benefit obligations, December 31 | 23,682 | 28,391
Plan asset (deficit) |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 2,390 |
Post-employment benefit obligations, December 31 | 3,249 | 2,390
Effect of asset limit |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (652) |
Post-employment benefit obligations, December 31 | (980) | (652)
DB PENSION PLANS |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 2,844 |
Current service cost | (193) | (223)
Interest on obligations | 84 | 11
Post-employment benefit obligations, December 31 | 3,059 | 2,844
Post-employment benefit assets | 3,559 | 3,472
Post-employment benefit obligations | (500) | (628)
DB PENSION PLANS | Benefit obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (24,544) | (27,149)
Current service cost | (193) | (223)
Interest on obligations | (770) | (697)
Actuarial gains (losses) | 4,856 | 2,137
Benefit payments | 1,366 | 1,396
Employee contributions | (9) | (9)
Other | (1) | 1
Post-employment benefit obligations, December 31 | (19,295) | (24,544)
DB PENSION PLANS | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 28,040 | 27,785
Interest on obligations | 875 | 708
Actuarial gains (losses) | (4,227) | 766
Benefit payments | (1,366) | (1,396)
Employer contributions | 81 | 168
Employee contributions | 9 | 9
Transfers to DC plans | (57) | 0
Other | 0 | 0
Post-employment benefit obligations, December 31 | 23,355 | 28,040
DB PENSION PLANS | Plan asset (deficit) |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 3,496 |
Post-employment benefit obligations, December 31 | 4,060 | 3,496
DB PENSION PLANS | Effect of asset limit |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (652) |
Interest on obligations | (21) | 0
Post-employment benefit obligations, December 31 | (980) | (652)
OPEB PLANS |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (1,106) |
Current service cost | (2) | (2)
Interest on obligations | (33) | (31)
Post-employment benefit obligations, December 31 | (811) | (1,106)
Post-employment benefit assets | 0 | 0
Post-employment benefit obligations | (811) | (1,106)
OPEB PLANS | Benefit obligations |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (1,457) | (1,600)
Current service cost | (2) | (2)
Interest on obligations | (44) | (39)
Actuarial gains (losses) | 294 | 113
Benefit payments | 70 | 71
Employee contributions | 0 | 0
Other | 1 | 0
Post-employment benefit obligations, December 31 | (1,138) | (1,457)
OPEB PLANS | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | 351 | 344
Interest on obligations | 11 | 8
Actuarial gains (losses) | (29) | 4
Benefit payments | (70) | (71)
Employer contributions | 64 | 65
Employee contributions | 0 | 0
Transfers to DC plans | 0 | 0
Other | 0 | 1
Post-employment benefit obligations, December 31 | 327 | 351
OPEB PLANS | Plan asset (deficit) |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefit obligations, January 1 | (1,106) |
Post-employment benefit obligations, December 31 | (811) | (1,106)
OPEB PLANS | Effect of asset limit |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
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 2022-03-24 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_f&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_f&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 141 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_140_a&doctype=Standard -URIDate 2022-03-24 + Details
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