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Debt (Details)
$ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 05, 2026
CAD ($)
Jun. 05, 2026
USD ($)
Apr. 13, 2026
CAD ($)
Apr. 13, 2026
USD ($)
Feb. 12, 2026
CAD ($)
Jan. 28, 2026
CAD ($)
Jan. 28, 2026
USD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2025
CAD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2025
CAD ($)
Jun. 05, 2026
USD ($)
Jun. 03, 2026
CAD ($)
Apr. 13, 2026
USD ($)
Mar. 30, 2026
CAD ($)
Apr. 14, 2025
CAD ($)
Apr. 14, 2025
USD ($)
Disclosure of detailed information about borrowings [line items]                                  
Net early debt redemption gains [1]               $ 89 $ 91 $ 89 $ 357            
Repayments of lease liabilities               $ 258 $ 278 $ 499 $ 582            
Debt Repurchase, Tranche Two                                  
Disclosure of detailed information about borrowings [line items]                                  
Early repayments of non-current borrowings $ 1,422                                
Debt Repurchase, Tranche One                                  
Disclosure of detailed information about borrowings [line items]                                  
Early repayments of non-current borrowings 963 $ 692                              
Series US-11 Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 899                     $ 650          
Series US-11 Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 5.45%                     5.45%          
Series US-1 Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 491                     $ 353          
Borrowings $ 1,601                     $ 1,150          
Series US-1 Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 4.464%                     4.464%          
Series US-2 Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 136                     $ 98          
Borrowings $ 593                     $ 426          
Series US-2 Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 4.30%                     4.30%          
Series US-4 Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 152                     $ 109          
Borrowings $ 587                     $ 421          
Series US-4 Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 3.65%                     3.65%          
Series US-5 Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 127                     $ 91          
Borrowings $ 581                     $ 417          
Series US-5 Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 2.15%                     2.15%          
Series US-6 Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 117                     $ 84          
Borrowings $ 639                     $ 459          
Series US-6 Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 3.20%                     3.20%          
Series US-7 Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 199                     $ 143          
Borrowings $ 742                     $ 533          
Series US-7 Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 3.65%                     3.65%          
Series M-3 Medium-term Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 60                                
Borrowings $ 200                                
Series M-3 Medium-term Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 6.55%                     6.55%          
Series M-39 Medium-term notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 301                                
Borrowings $ 395                                
Series M-39 Medium-term notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 4.35%                     4.35%          
M-45 MTN debentures                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 367                                
Borrowings $ 400                                
M-45 MTN debentures | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 4.45%                     4.45%          
Series M-52 Medium-term Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 345                                
Borrowings $ 1,000                                
Series M-52 Medium-term Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 2.50%                     2.50%          
Series M-60 Medium-term Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, repurchase amount $ 380                                
Borrowings $ 600                                
Series M-60 Medium-term Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate 5.15%                     5.15%          
Series M-69 Medium-term Notes                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings                         $ 900        
Series M-69 Medium-term Notes | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate                         4.70%        
M-70 MTN debentures                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings                         $ 700        
M-70 MTN debentures | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate                         5.30%        
M-68 MTN debentures                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings                             $ 750    
M-68 MTN debentures | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate                             4.40%    
Fixed-to-Fixed Rate Junior Subordinated Notes, Series D                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings         $ 750                        
Borrowings, interest rate, reset term         5 years                        
Borrowings, terms         5 years                        
Fixed-to-Fixed Rate Junior Subordinated Notes, Series D | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate         5.375%                        
Fixed-to-Fixed Rate Junior Subordinated Notes, Series D | Government of Canada yield plus a spread                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, adjustment to interest rate basis         2.388%                        
Fixed-to-Fixed Rate Junior Subordinated Notes, Series E                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings         $ 750                        
Borrowings, interest rate, reset term         5 years                        
Borrowings, terms         5 years                        
Borrowings, redemption price, percentage         100.00%                        
Fixed-to-Fixed Rate Junior Subordinated Notes, Series E | Fixed interest rate                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, interest rate         5.875%                        
Fixed-to-Fixed Rate Junior Subordinated Notes, Series E | Government of Canada yield plus a spread                                  
Disclosure of detailed information about borrowings [line items]                                  
Borrowings, adjustment to interest rate basis         2.44%                        
Unsecured Committed Term Loan                                  
Disclosure of detailed information about borrowings [line items]                                  
Proceeds from borrowings     $ 152 $ 110   $ 139 $ 102                    
Line of credit facility, maximum borrowing capacity     $ 972                     $ 700   $ 972 $ 700
[1] We have presented amounts from the previous period to make them consistent with the presentation for the current period.