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Post-employment benefit plans - Defined Benefit Plans Recognized in Comprehensive Income (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Employee Benefits [Abstract]
Cumulative losses recognized directly in equity, January 1	$ (2,014)	$ (2,701)
Actuarial gains in other comprehensive income from continuing operations	3,020	732
Increase in the effect of the asset limit in other comprehensive income from continuing operations	(587)	(45)
Cumulative gains (losses) recognized directly in equity, December 31	419	$ (2,014)
Cumulative actuarial losses	805
Cumulative decrease in the effect of the asset limit	$ 386

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- Definition

Employee Benefits [Abstract]

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Reserve Of Measurements Of Defined Benefit Plans, Before Tax

+ References

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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 2021-01-01
-Paragraph 141
-Subparagraph c
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c_iv&doctype=Standard
-URIDate 2021-03-24

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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 2021-01-01
-Paragraph 141
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_141_c&doctype=Standard
-URIDate 2021-03-24

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