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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details) - CAD ($)
$ in Millions
Jun. 30, 2026
Sep. 24, 2025
May 16, 2025
Medium-term notes, maturing january 6, 2031      
Disclosure of information about consolidated structured entities [line items]      
Notional amount   $ 700  
Medium-term notes, maturing january 6, 2031 | Fixed interest rate      
Disclosure of information about consolidated structured entities [line items]      
Borrowings, interest rate 3.70% 3.70%  
Medium-term Notes, Maturing January 6, 2031 Tranche One      
Disclosure of information about consolidated structured entities [line items]      
Notional amount   $ 375  
Borrowings, interest rate   3.70%  
Medium-term Notes, Maturing January 6, 2031 Tranche Two      
Disclosure of information about consolidated structured entities [line items]      
Notional amount   $ 325  
Borrowings, interest rate   4.526%  
Subordinated notes, maturing september 1, 2055      
Disclosure of information about consolidated structured entities [line items]      
Notional amount     $ 250
Subordinated notes, maturing september 1, 2055 | Fixed interest rate      
Disclosure of information about consolidated structured entities [line items]      
Borrowings, interest rate 5.60%   5.60%
Subordinated Notes, Maturing September 1, 2030, | Floating interest rate      
Disclosure of information about consolidated structured entities [line items]      
Borrowings variable rate     0.027