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Post-employment benefit plans - Defined Benefit Plans Recognized in Comprehensive Income (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Employee Benefits [Abstract] |  |
Cumulative gains recognized directly in equity, January 1 | $ 985 | $ 419
Actuarial (losses) gains in other comprehensive (loss) income | (835) | 894
Decrease (increase) in the effect of the asset limit in other comprehensive (loss) income | 282 | (328)
Cumulative gains recognized directly in equity, December 31 | 432 | $ 985
Cumulative actuarial gain (loss) | 864 |
Cumulative increase in the effect of the asset limit | $ 432 |

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- Definition Employee Benefits [Abstract] + References No definition available. + Details
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- Definition Reserve Of Measurements Of Defined Benefit Plans, Actuarial Gain (Loss), Before Tax + References No definition available. + Details
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- Definition Reserve Of Measurements Of Defined Benefit Plans, Effect Of Asset Limit, Before Tax + References No definition available. + 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 2023-01-01 -Paragraph 141 -Subparagraph c -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_c_iv&doctype=Standard -URIDate 2023-03-23 + 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 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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