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Pensions and Other Post Retirement Benefits (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Changes |  |
Net surplus / (unfunded) obligation at end of year | $ (390) | $ (1,274)
Minimum |  |
Pensions and Other Post Retirement Benefits |  |
Defined contribution plans annual contribution (as a percent) | 5.00% |
Maximum |  |
Pensions and Other Post Retirement Benefits |  |
Defined contribution plans annual contribution (as a percent) | 11.50% |
Pension and Other Post Retirement Benefits | Canada |  |
Changes |  |
Percentage of net unfunded obligations | 96.00% | 98.00%
Pension and Other Post Retirement Benefits | Canada | Weighted average |  |
Changes |  |
Weighted average duration of defined benefit obligation | 16 years 4 months 24 days | 15 years 1 month 6 days
Pension Benefits |  |
Changes |  |
Current service costs | $ 263 | $ 302
Actuarial remeasurement: Experience (gain) loss arising on plan liabilities | (86) | (1)
Actuarial remeasurement: Actuarial gain arising from changes in demographic assumptions |  | (2)
Actuarial remeasurement: Actuarial gain arising from changes in financial assumptions | (2,229) | (572)
Return on plan assets greater / (less) than discount rate | (1,190) | 530
Effect of the asset ceiling | 187 |
Pension Benefits | Obligations |  |
Changes |  |
Balance at beginning of year | 8,303 | 8,682
Current service costs | 263 | 302
Plan participants' contributions | (17) | (17)
Benefits paid | 367 | 350
Interest costs (income) | 246 | 222
Foreign exchange | (2) | (6)
Settlements | 10 | 11
Actuarial remeasurement: Experience (gain) loss arising on plan liabilities | (86) | (1)
Actuarial remeasurement: Actuarial gain arising from changes in demographic assumptions |  | (2)
Actuarial remeasurement: Actuarial gain arising from changes in financial assumptions | (2,229) | (572)
Balance at end of year | 6,155 | 8,303
Pension Benefits | Plan assets |  |
Changes |  |
Balance at beginning of year | (7,701) | (7,305)
Employer contributions | 61 | (11)
Plan participants' contributions | 17 | 17
Benefits paid | (347) | (325)
Interest costs (income) | (225) | (181)
Foreign exchange | 4 | 5
Settlements | (10) | (11)
Administrative costs | (2) | (2)
Return on plan assets greater / (less) than discount rate | (1,190) | 530
Balance at end of year | (6,471) | (7,701)
Net surplus / (unfunded) obligation at end of year | 129 | (602)
Pension Benefits | Irrecoverable surplus |  |
Changes |  |
Effect of the asset ceiling | 187 |
Other Post-Retirement Benefits |  |
Changes |  |
Current service costs | 19 | 19
Actuarial remeasurement: Experience (gain) loss arising on plan liabilities | 3 | (1)
Actuarial remeasurement: Actuarial gain arising from changes in financial assumptions | (167) | (27)
Other Post-Retirement Benefits | Obligations |  |
Changes |  |
Balance at beginning of year | 672 | 690
Current service costs | 19 | 19
Benefits paid | 28 | 27
Interest costs (income) | 20 | 18
Actuarial remeasurement: Experience (gain) loss arising on plan liabilities | 3 | (1)
Actuarial remeasurement: Actuarial gain arising from changes in financial assumptions | (167) | (27)
Balance at end of year | 519 | 672
Other Post-Retirement Benefits | Plan assets |  |
Changes |  |
Net surplus / (unfunded) obligation at end of year | $ (519) | $ (672)

X
- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [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 -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [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 -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2022-03-24 + 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 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 the net defined benefit liability (asset) resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer: Interest income (expense); Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 141 -Subparagraph c -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [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 e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_e&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 141 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_b&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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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 141 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_57_a&doctype=Standard -URIDate 2022-03-24 + Details
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