Accounts Receivables and Accrued Revenues (Detail) - CAD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Trade and other current receivables [abstract]
Accounts Receivable and Accrued Revenues	$ 5,272	$ 3,435

The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
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Name:	ifrs-full_TradeAndOtherCurrentReceivables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant