RELATED PARTY TRANSACTIONS - Associates and Joint Arrangements (Details) - Total for all subsidiaries - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Disclosure of transactions between related parties [line items]
Revenue	$ 51	$ 45
Purchases and lease payments	174	231
Accounts receivable	95	101
Accounts payable and other liabilities	$ 300	$ 163

The amounts receivable resulting from related party transactions. [Refer: Total for all related parties [member]]

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 Effective 2027-01-01
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant