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Consolidated Statements of Comprehensive Loss (Parenthetical) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of comprehensive income [abstract]
Net impact related to net actuarial gains (losses)	$ (1)	$ 12	$ 11
Net income tax expense (recovery) relating to gains (losses) on financial instruments	1	(3)	0
Net of income tax (recovery) expense	10	(138)	55
Net of reclassification of income tax expense (recovery)	$ 17	$ 26	$ 2

X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2023-01-01
-Paragraph 81
-Subparagraph ab
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_ab&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 90
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_90&doctype=Standard
-URIDate 2023-03-23

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- References

No definition available.

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X

- Definition

Income Tax Expense (Recovery) Relating to Gains (Losses) on Financial Instruments Designated as Hedges of Foreign Operations of Other Comprehensive Income

+ References

No definition available.

+ Details

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X

- Definition

Income Tax Expense (Recovery) Relating To Gains On Derivatives Designated As Cash Flow Hedges Of Other Comprehensive Income

+ References

No definition available.

+ Details

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- Definition

Income Tax Expense (Recovery) Relating To Reclassification Of Gains On Derivatives Designated As Cash Flow Hedges To Net Earnings

+ References

No definition available.

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