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Derivative and Hedging Instruments - Summary of Effects of Net Investment Hedging Relationships (Detail) - Hedges of net investment in foreign operations [Member] - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about hedges [Line Items]
Change in value of hedging instruments for ineffectiveness measurement	$ (196)	$ 444
Change in value of the hedged item for ineffectiveness measurement	196	(444)
Gains (losses) deferred in AOCI	196	(444)
Forward contracts [Member]
Disclosure of detailed information about hedges [Line Items]
Change in value of hedging instruments for ineffectiveness measurement	(1)	(14)
Change in value of the hedged item for ineffectiveness measurement	1	14
Gains (losses) deferred in AOCI	1	14
Non-functional currency denominated debt [Member]
Disclosure of detailed information about hedges [Line Items]
Change in value of hedging instruments for ineffectiveness measurement	(195)	458
Change in value of the hedged item for ineffectiveness measurement	195	(458)
Gains (losses) deferred in AOCI	$ 195	$ (458)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

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- Definition

The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24B
-Subparagraph a
-Clause iv
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-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24B
-Subparagraph b
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- Definition

The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24A
-Subparagraph c
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- Definition

Gains (losses) deferred in accumulated other comprehensive income on derivatives.

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