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Long-term debt - Narrative (Details)
$ in Millions, $ in Millions
Feb. 18, 2025
CAD ($)
series
Feb. 18, 2025
USD ($)
series
Dec. 31, 2024
May 24, 2024
CAD ($)
Feb. 15, 2024
CAD ($)
Feb. 15, 2024
USD ($)
Nov. 14, 2023
CAD ($)
Aug. 11, 2023
CAD ($)
May 11, 2023
CAD ($)
May 11, 2023
USD ($)
Feb. 09, 2023
CAD ($)
Series M-61 Medium Term Notes Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount       $ 400              
Series M-61 Medium Term Notes Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)       5.60%              
Series M-63 Medium Term Notes Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount       $ 1,100              
Series M-63 Medium Term Notes Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)       5.15%              
Series US -9 Medium Term Notes Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount         $ 942 $ 700          
Series US -9 Medium Term Notes Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)         5.20% 5.20%          
Series US -10 Medium Term Notes Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount         $ 1,009 $ 750          
Series US -10 Medium Term Notes Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)         5.55% 5.55%          
Fixed-to-Fixed Rate Junior Subordinated Notes | Public Offering                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount $ 3,187 $ 2,250                  
Number of series of notes in public offering | series 2 2                  
Fixed-to-Fixed Rate Junior Subordinated Notes, Series A due 2055 | Public Offering                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount $ 1,416 $ 1,000                  
Borrowings, interest rate, reset term 5 years 5 years                  
Borrowings, interest rate, term 5 years 5 years                  
Borrowings, adjustment to interest rate basis 2.39% 2.39%                  
Borrowings, redemption price, percentage 100.00%                    
Fixed-to-Fixed Rate Junior Subordinated Notes, Series A due 2055 | Five Year Fixed Interest Rate | Public Offering                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent) 6.875% 6.875%                  
Fixed-to-Fixed Rate Junior Subordinated Notes, Series A due 2055 | Interest Rate Floor | Public Offering                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent) 6.875% 6.875%                  
Series M-57 Medium Term Notes Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount             $ 300        
Series M-57 Medium Term Notes Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)             5.85%        
Series M-62 Medium Term Notes Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount             $ 700        
Series M-62 Medium Term Notes Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)             5.25%        
Series M-60 Medium Term Note Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount               $ 600      
Series M-60 Medium Term Note Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)               5.15%      
Series M-61 Medium Term Note Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount               $ 400      
Series M-61 Medium Term Note Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)               5.60%      
Series US-8 Notes                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount                 $ 1,138 $ 850  
Series US-8 Notes | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)                 5.10% 5.10%  
Series M-58 Medium Term Notes                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount                     $ 1,050
Series M-58 Medium Term Notes | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)                     4.55%
Series M-59 Medium Term Notes Debentures                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount                     $ 450
Series M-59 Medium Term Notes Debentures | Fixed interest rate                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent)                     5.15%
Fixed-to-Fixed Rate Junior Subordinated Notes, Series B due 2055 | Public Offering                      
Disclosure of detailed information about borrowings [line items]                      
Principal amount $ 1,771 $ 1,250                  
Borrowings, interest rate, reset term 5 years 5 years                  
Borrowings, interest rate, term 5 years 5 years                  
Borrowings, adjustment to interest rate basis 2.363% 2.363%                  
Borrowings, redemption price, percentage 100.00%                    
Fixed-to-Fixed Rate Junior Subordinated Notes, Series B due 2055 | Five Year Fixed Interest Rate | Public Offering                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent) 7.00% 7.00%                  
Fixed-to-Fixed Rate Junior Subordinated Notes, Series B due 2055 | Interest Rate Floor | Public Offering                      
Disclosure of detailed information about borrowings [line items]                      
Interest rate (as a percent) 7.00% 7.00%                  
Bottom of range                      
Disclosure of detailed information about borrowings [line items]                      
Number of days between invoice date and payment due date for trade payables that are not part of supplier finance arrangements     30 days                
Top of range                      
Disclosure of detailed information about borrowings [line items]                      
Number of days between invoice date and payment due date for trade payables that are not part of supplier finance arrangements     60 days                
Financial liabilities that are part of supplier finance arrangements                      
Disclosure of detailed information about borrowings [line items]                      
Supplier finance arrangement, term     5 years