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SUBSIDIARY PUBLIC ISSUERS - Additional Information (Details)
$ in Millions, $ in Millions
Feb. 22, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Nov. 29, 2024
CAD ($)
Jun. 05, 2024
CAD ($)
May 31, 2024
CAD ($)
Dec. 31, 2023
USD ($)
Jul. 27, 2023
CAD ($)
Disclosure of information about consolidated structured entities [line items]              
Notional amount   $ 21,604       $ 21,276  
Subordinated notes, Maturing March 15, 2055              
Disclosure of information about consolidated structured entities [line items]              
Notional amount     $ 300        
Annual rate   6.80%          
Subordinated notes, Maturing May 31, 2084              
Disclosure of information about consolidated structured entities [line items]              
Notional amount       $ 8 $ 150    
Annual rate   7.30%          
Medium-term Notes, Maturing July 27, 2030              
Disclosure of information about consolidated structured entities [line items]              
Notional amount             $ 700
Medium-term Notes, Maturing July 27, 2030 Tranche One              
Disclosure of information about consolidated structured entities [line items]              
Notional amount             500
Medium-term Notes, Maturing July 27, 2030 Tranche Two              
Disclosure of information about consolidated structured entities [line items]              
Notional amount             $ 200
Medium-term Notes, Maturing February 22, 2024              
Disclosure of information about consolidated structured entities [line items]              
Repayments of bonds, notes and debentures $ 700            
Fixed interest rate | Subordinated notes, Maturing March 15, 2055              
Disclosure of information about consolidated structured entities [line items]              
Annual rate   6.80% 6.80%        
Fixed interest rate | Subordinated notes, Maturing May 31, 2084              
Disclosure of information about consolidated structured entities [line items]              
Annual rate   7.30%   7.30% 7.25%    
Fixed interest rate | Medium-term Notes, Maturing July 27, 2030              
Disclosure of information about consolidated structured entities [line items]              
Annual rate   5.70%          
Fixed interest rate | Medium-term Notes, Maturing July 27, 2030 Tranche One              
Disclosure of information about consolidated structured entities [line items]              
Annual rate             5.71%
Fixed interest rate | Medium-term Notes, Maturing July 27, 2030 Tranche Two              
Disclosure of information about consolidated structured entities [line items]              
Annual rate             5.95%
Fixed interest rate | Medium-term Notes, Maturing February 22, 2024              
Disclosure of information about consolidated structured entities [line items]              
Annual rate 3.315% 3.30%          
Floating interest rate | Subordinated notes, Maturing March 15, 2030              
Disclosure of information about consolidated structured entities [line items]              
Borrowings, variable rate     2.453%