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Income taxes - Disclosure of Current and Deferred Taxes (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
OTHER COMPREHENSIVE (LOSS)/INCOME
Current taxes	$ (2)	$ 0
Deferred taxes	199	(73)
Total income taxes recovery (expense)	197	(73)
DEFICIT
Current taxes	1	3
Deficit	(8)	(7)
Total income taxes recovery (expense)	$ (7)	$ (4)

X

- Definition

Current Tax Expense (Income) Recognised In Other Comprehensive Income

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- Definition

Deferred Tax Expense (Income) Recognised In Other Comprehensive Income

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- Definition

The aggregate current and deferred tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Deferred tax relating to items credited (charged) directly to equity; Retained earnings; Financial instruments, class [member]]

+ References

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-IssueDate 2023-01-01
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The amount of current tax relating to particular items that are charged or credited directly to equity, for example: (a) an adjustment to the opening balance of retained earnings resulting from either a change in accounting policy that is applied retrospectively or the correction of an error; and (b) amounts arising on initial recognition of the equity component of a compound financial instrument. [Refer: Retained earnings; Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)]

+ References

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-Name IAS
-Number 12
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The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income]

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