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Post-employment benefit plans - Defined Benefit Plans Recognized in Comprehensive Income (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income [abstract]
Cumulative gains recognized directly in equity, January 1	$ 432	$ 985
Actuarial gains (losses) in other comprehensive income (loss)	984	(835)
Increase (decrease) in the effect of the asset limit in other comprehensive income (loss)	(188)	282
Cumulative gains recognized directly in equity, December 31	1,228	$ 432
Cumulative actuarial gain (loss)	1,848
Cumulative increase in the effect of the asset limit	$ 620

X

- Definition

Reserve Of Measurements Of Defined Benefit Plans, Actuarial Gain (Loss), Before Tax

+ References

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- Definition

Reserve Of Measurements Of Defined Benefit Plans, Before Tax

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- Definition

Reserve Of Measurements Of Defined Benefit Plans, Effect Of Asset Limit, Before Tax

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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 2024-01-01
-Paragraph 141
-Subparagraph c
-Clause iv
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-URIDate 2024-03-27

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X

- 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 2024-01-01
-Paragraph 141
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_c&doctype=Standard
-URIDate 2024-03-27

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