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Income taxes - Disclosure of Current and Deferred Taxes (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
OTHER COMPREHENSIVE (INCOME) LOSS
Current taxes	$ 0	$ 3
Deferred taxes	(172)	(90)
Total income taxes (expense) recovery	(172)	(87)
DEFICIT
Current taxes	14	4
Deficit	(20)	13
Total income taxes (expense) recovery	$ (6)	$ 17

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- Definition

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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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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]]

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

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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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