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Long Term Debt - Carrying Value of Long-Term Debt Instruments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
$ / shares
Dec. 31, 2023
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 6,629   $ 6,071
3.050% Senior notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 3.05%    
Issue date Aug. 27, 2020    
Maturity date Aug. 27, 2060    
Debt instrument, par value | $ / shares   $ 1,155  
Long-term debt $ 1,659   1,519
5.375% Senior notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 5.375%    
Issue date Mar. 04, 2016    
Maturity date Mar. 04, 2046    
Debt instrument, par value | $ / shares   750  
Long-term debt $ 1,067   977
Debt instrument basis points 0.40%    
3.703% Senior notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 3.703%    
Issue date Mar. 16, 2022    
Maturity date Mar. 16, 2032    
Debt instrument, par value | $ / shares   750  
Long-term debt $ 1,074   983
Debt instrument basis points 0.25%    
2.396% Senior notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 2.396%    
Issue date Jun. 01, 2020    
Maturity date Jun. 01, 2027    
Debt instrument, par value | $ / shares   200  
Long-term debt $ 287   263
Debt instrument basis points 0.30%    
2.484% Senior notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 2.484%    
Issue date May 19, 2020    
Maturity date May 19, 2027    
Debt instrument, par value | $ / shares   500  
Long-term debt $ 717   657
Debt instrument basis points 0.30%    
3.527% Senior notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 3.527%    
Issue date Dec. 02, 2016    
Maturity date Dec. 02, 2026    
Debt instrument, par value | $ / shares   270  
Long-term debt $ 388   356
Debt instrument basis points 0.20%    
4.150% Senior notes      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 4.15%    
Issue date Mar. 04, 2016    
Maturity date Mar. 04, 2026    
Debt instrument, par value | $ / shares   $ 1,000  
Long-term debt $ 1,437   $ 1,316
Debt instrument basis points 0.35%