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Post-employment benefit plans - Defined Benefit Plans Recognized in Comprehensive Income (Details) - CAD ($) $ in Millions	12 Months Ended
	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

X

- Definition

Employee Benefits [Abstract]

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No definition available.

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- Definition

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

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No definition available.

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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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No definition available.

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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

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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

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