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Employee Future Benefits - Summary of Potential Impact on Obligations Arising From Changes in Key Assumptions (Detail) $ in Millions | Dec. 31, 2022 CAD ($)
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Actuarial assumption of discount rates [Member] | Pension defined benefit plans [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of increase in actuarial assumption | $ (279)
Impact of decrease in actuarial assumption | 322
Actuarial assumption of discount rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of increase in actuarial assumption | (39)
Impact of decrease in actuarial assumption | 45
Actuarial assumption of medical cost trend rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of increase in actuarial assumption | 10
Impact of decrease in actuarial assumption | (9)
Actuarial assumption of decrease in inflation rates [Member] | Pension defined benefit plans [member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of decrease in actuarial assumption | 93
Actuarial assumption of decrease in inflation rates [Member] | Retiree welfare plans [Member] |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |
Impact of decrease in actuarial assumption | $ 8

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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