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Derivative and Hedging Instruments - Summary of Detailed Information About Cost of Hedging (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2023 CAD ($)
Foreign Exchange Risk [member]
Cost of hedging [abstract]
Accumulated other comprehensive income (loss), beginning of the year	$ 5
Accumulated other comprehensive income (loss), end of the year	3
Interest and foreign exchange risk [Member]
Cost of hedging [abstract]
Accumulated other comprehensive income (loss), beginning of the year	(114)
Accumulated other comprehensive income (loss), end of the year	(107)
IFRS 9 [Member] | Foreign Exchange Risk [member]
Cost of hedging [abstract]
Accumulated other comprehensive income (loss), beginning of the year	(3)
Changes in fair value	5
Amount reclassified to profit or loss	2
Accumulated other comprehensive income (loss), end of the year	0
IFRS 9 [Member] | Interest and foreign exchange risk [Member]
Cost of hedging [abstract]
Accumulated other comprehensive income (loss), beginning of the year	25
Changes in fair value	(8)
Amount reclassified to profit or loss	(1)
Accumulated other comprehensive income (loss), end of the year	$ 18

X

- Definition

The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2023-01-01
-Paragraph 55
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-URIDate 2023-03-23

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- References

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- Definition

The amount of reclassification adjustments related to change in value of foreign currency basis spreads, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 92
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_92&doctype=Standard
-URIDate 2023-03-23

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- Definition

Change in fair value of hedges.

+ References

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