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Long-Term Debt - Summary of Long-term Debt (Details)
$ in Millions
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.80% 3.80%    
Borrowings $ 18,819   $ 10,799  
Less: current portion of commercial paper 672   0  
current portion of long-term debt 1,728   980  
Long-term debt 16,419   9,819  
Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings 18,909   10,859  
Original issue discounts, net        
Disclosure of detailed information about borrowings [line items]        
Borrowings 12   11  
Transaction costs        
Disclosure of detailed information about borrowings [line items]        
Borrowings 78   49  
Medium-term notes | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,466   1,286  
3.55% debentures due June 3, 2024        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.55% 3.55%    
3.55% debentures due June 3, 2024 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 0   320  
3.42% debentures due December 1, 2026        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.42% 3.42%    
3.42% debentures due December 1, 2026 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 441   441  
2.50% debentures due January 17, 2028        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.50% 2.50%    
2.50% debentures due January 17, 2028 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 225   225  
4.15% debentures due December 15, 2031        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 4.15% 4.15%    
Borrowings $ 500      
4.15% debentures due December 15, 2031 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 500   0  
4.85% debentures due May 30, 2047        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 4.85% 4.85%    
4.85% debentures due May 30, 2047 | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 300   300  
Bank credit facilities (December 31, 2024 – US$3,393 million;
December 31, 2023 – US$nil)        
Disclosure of detailed information about borrowings [line items]        
Borrowings   $ 3,393,000,000   $ 0
Bank credit facilities (December 31, 2024 – US$3,393 million;
December 31, 2023 – US$nil) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings 4,888   0  
Commercial paper (December 31, 2024 – US$467 million; 
December 31, 2023 – US$nil)        
Disclosure of detailed information about borrowings [line items]        
Borrowings 672 $ 467,000,000   $ 0
Commercial paper (December 31, 2024 – US$467 million; 
December 31, 2023 – US$nil) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings 672   0  
US Dollar Denominated Debt | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 17,443   9,573  
3.80% due April 15, 2024 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.80% 3.80%    
Notional amount   $ 500,000,000    
3.80% due April 15, 2024 (US$500 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 0   660  
3.90% due February 1, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.90% 3.90%    
Notional amount   $ 600,000,000    
Borrowings   $ 600,000,000    
3.90% due February 1, 2025 (US$600 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 864   792  
2.05% due July 15, 2025 (US$600 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.05% 2.05%    
Notional amount   $ 600,000,000    
2.05% due July 15, 2025 (US$600 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 864   792  
3.85% due June 1, 2027 (US$1,250 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 3.85% 3.85%    
Notional amount   $ 1,250,000,000    
3.85% due June 1, 2027 (US$1,250 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,801   1,651  
5.00% due December 15, 2029 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 5.00% 5.00%    
Notional amount   $ 750,000,000    
Borrowings   $ 750,000,000    
5.00% due December 15, 2029 (US$750 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,080   0  
2.95% due July 15, 2030 (US$500 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 2.95% 2.95%    
Notional amount   $ 500,000,000    
2.95% due July 15, 2030 (US$500 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 720   660  
7.20% due January 15, 2032 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 7.20% 7.20%    
Notional amount   $ 400,000,000    
7.20% due January 15, 2032 (US$400 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 576   528  
6.45% due June 30, 2033 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.45% 6.45%    
Notional amount   $ 350,000,000    
6.45% due June 30, 2033 (US$350 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 504   462  
5.40% due December 15, 2034 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 5.40% 5.40%    
Notional amount   $ 750,000,000    
Borrowings $ 1,080 $ 750,000,000 0  
5.85% due February 1, 2035 (US$350 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 5.85% 5.85%    
Notional amount   $ 350,000,000    
5.85% due February 1, 2035 (US$350 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 504   462  
6.50% due February 15, 2037 (US$450 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.50% 6.50%    
Notional amount   $ 450,000,000    
6.50% due February 15, 2037 (US$450 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 649   594  
6.25% due March 15, 2038 (US$1,100 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.25% 6.25%    
Notional amount   $ 1,100,000,000    
6.25% due March 15, 2038 (US$1,100 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,585   1,453  
6.75% due February 1, 2039 (US$400 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 6.75% 6.75%    
Notional amount   $ 400,000,000    
6.75% due February 1, 2039 (US$400 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 576   528  
4.95% due June 1, 2047 (US$750 million)        
Disclosure of detailed information about borrowings [line items]        
Borrowings, interest rate 4.95% 4.95%    
Notional amount   $ 750,000,000    
4.95% due June 1, 2047 (US$750 million) | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings $ 1,080   $ 991