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Pensions and Other Post-Employment Benefits - Sensitivity of Defined Benefit and OPEB Obligation to Changes in Relevant Actuarial Assumptions (Detail) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Discount Rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase | $ (43) | $ (59)
Decrease | 51 | 76
Future Salary Growth Rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase | 3 | 4
Decrease | (3) | (4)
Health Care Cost Trend Rate |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase | 19 | 26
Decrease | (17) | (20)
One Year Change in Assumed Life Expectancy |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Increase | 10 | 4
Decrease | $ (10) | $ (4)

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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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