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LONG-TERM DEBT - Summary of Long-term Debt (Details)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CAD ($)
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 38,200,000,000   $ 39,755,000,000
Deferred transaction costs and discounts (951,000,000)   (1,040,000,000)
Deferred government grant liability (39,000,000)   0
Less current portion (3,696,000,000)   (1,100,000,000)
Canada Infrastructure Bank Credit Facility due 2052 1.000%      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 64,000,000    
Canada Infrastructure Bank Credit Facility due 2052 1.000% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Interest rate 1.00% 1.00%  
Senior Notes Due 2024 - 4.000% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 600,000,000    
Interest rate 4.00% 4.00%  
Senior Notes Due 2024 - 4.350% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 500,000,000    
Interest rate 4.35% 4.35%  
Senior Notes Due 2025 - 2.950% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,000,000,000  
Interest rate 2.95% 2.95%  
Senior Notes Due 2025 - 3.100% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,250,000,000    
Interest rate 3.10% 3.10%  
Senior Notes Due 2025 - 3.625% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 700,000,000  
Interest rate 3.625% 3.625%  
Senior Notes Due 2026 - 5.650% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 500,000,000 $ 500,000,000
Interest rate 5.65% 5.65% 5.65%
Senior Notes Due 2026 - 2.900% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 500,000,000  
Interest rate 2.90% 2.90%  
Senior Notes Due 2027 - 3.650% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,500,000,000    
Interest rate 3.65% 3.65%  
Senior Notes Due 2027 - 3.800% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 300,000,000    
Interest rate 3.80% 3.80%  
Senior Notes Due 2027 - 3.200% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,300,000,000  
Interest rate 3.20% 3.20%  
Senior Notes Due 2028 - 5.700% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,000,000,000 $ 1,000,000,000
Interest rate 5.70% 5.70% 5.70%
Senior Notes Due 2028 - 4.400% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 500,000,000  
Interest rate 4.40% 4.40%  
Senior Notes Due 2029 - 3.300% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 500,000,000    
Interest rate 3.30% 3.30%  
Senior Notes Due 2029 - 3.750% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,000,000,000    
Interest rate 3.75% 3.75%  
Senior Notes Due 2029 - 3.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,000,000,000    
Interest rate 3.25% 3.25%  
Senior Notes Due 2029 - 5.000% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,250,000,000  
Interest rate 5.00% 5.00%  
Senior Notes Due 2030 - 5.800% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 500,000,000   $ 500,000,000
Interest rate 5.80% 5.80% 5.80%
Senior Notes Due 2030 - 2.900% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 500,000,000    
Interest rate 2.90% 2.90%  
Senior Notes Due 2032 - 3.800% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 2,000,000,000  
Interest rate 3.80% 3.80%  
Senior Notes Due 2032 - 4.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,000,000,000    
Interest rate 4.25% 4.25%  
Senior Debentures Due 2032 - 8.750% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 200,000,000  
Interest rate 8.75% 8.75%  
Senior Notes Due 2033 - 5.900% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,000,000,000   $ 1,000,000,000
Interest rate 5.90% 5.90% 5.90%
Senior Notes Due 2034 - 5.300% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,250,000,000  
Interest rate 5.30% 5.30%  
Senior Notes Due 2038 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 350,000,000  
Interest rate 7.50% 7.50%  
Senior Notes Due 2039 - 6.680% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 500,000,000    
Interest rate 6.68% 6.68%  
Senior Notes Due 2039 - 6.750% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,450,000,000    
Interest rate 6.75% 6.75%  
Senior Notes Due 2040 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 800,000,000    
Interest rate 6.11% 6.11%  
Senior Notes Due 2041 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 400,000,000    
Interest rate 6.56% 6.56%  
Senior Notes Due 2042 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 750,000,000  
Interest rate 4.50% 4.50%  
Senior Notes Due 2043 - 4.500% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 500,000,000  
Interest rate 4.50% 4.50%  
Senior Notes Due 2043 - 5.450% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 650,000,000  
Interest rate 5.45% 5.45%  
Senior Notes Due 2044 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,050,000,000  
Interest rate 5.00% 5.00%  
Senior Notes Due 2048 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 750,000,000  
Interest rate 4.30% 4.30%  
Senior Notes Due 2049 - 4.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 300,000,000  
Interest rate 4.25% 4.25%  
Senior Notes Due 2049 - 4.350% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,250,000,000  
Interest rate 4.35% 4.35%  
Senior Notes Due 2049 - 3.700% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 1,000,000,000  
Interest rate 3.70% 3.70%  
Senior Notes Due 2052 - 4.550% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 2,000,000,000  
Interest rate 4.55% 4.55%  
Senior Notes Due 2052 - 5.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 1,000,000,000    
Interest rate 5.25% 5.25%  
Subordinated Notes Due 2081 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount $ 2,000,000,000    
Interest rate 5.00% 5.00%  
Subordinated Notes Due 2082 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Principal amount   $ 750,000,000  
Interest rate 5.25% 5.25%  
Gross carrying amount      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 42,886,000,000   $ 41,895,000,000
Gross carrying amount | Term Loan Facilities | Floating interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,001,000,000   4,286,000,000
Gross carrying amount | Canada Infrastructure Bank Credit Facility due 2052 1.000% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 64,000,000   0
Gross carrying amount | Senior Notes Due 2024 - 4.000% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 0   600,000,000
Gross carrying amount | Senior Notes Due 2024 - 4.350% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 0   500,000,000
Gross carrying amount | Senior Notes Due 2025 - 2.950% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,439,000,000   1,323,000,000
Gross carrying amount | Senior Notes Due 2025 - 3.100% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,250,000,000   1,250,000,000
Gross carrying amount | Senior Notes Due 2025 - 3.625% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,007,000,000   926,000,000
Gross carrying amount | Senior Notes Due 2026 - 5.650% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 500,000,000   500,000,000
Gross carrying amount | Senior Notes Due 2026 - 2.900% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 718,000,000   661,000,000
Gross carrying amount | Senior Notes Due 2027 - 3.650% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,500,000,000   1,500,000,000
Gross carrying amount | Senior Notes Due 2027 - 3.800% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 300,000,000   300,000,000
Gross carrying amount | Senior Notes Due 2027 - 3.200% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,871,000,000   1,719,000,000
Gross carrying amount | Senior Notes Due 2028 - 5.700% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,000,000,000   1,000,000,000
Gross carrying amount | Senior Notes Due 2028 - 4.400% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 500,000,000   500,000,000
Gross carrying amount | Senior Notes Due 2029 - 3.300% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 500,000,000   500,000,000
Gross carrying amount | Senior Notes Due 2029 - 3.750% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,000,000,000   1,000,000,000
Gross carrying amount | Senior Notes Due 2029 - 3.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,000,000,000   1,000,000,000
Gross carrying amount | Senior Notes Due 2029 - 5.000% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,799,000,000   0
Gross carrying amount | Senior Notes Due 2030 - 5.800% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 500,000,000   500,000,000
Gross carrying amount | Senior Notes Due 2030 - 2.900% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 500,000,000   500,000,000
Gross carrying amount | Senior Notes Due 2032 - 3.800% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 2,878,000,000   2,645,000,000
Gross carrying amount | Senior Notes Due 2032 - 4.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,000,000,000   1,000,000,000
Gross carrying amount | Senior Debentures Due 2032 - 8.750% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 288,000,000   265,000,000
Gross carrying amount | Senior Notes Due 2033 - 5.900% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,000,000,000   1,000,000,000
Gross carrying amount | Senior Notes Due 2034 - 5.300% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,799,000,000   0
Gross carrying amount | Senior Notes Due 2038 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 504,000,000   463,000,000
Gross carrying amount | Senior Notes Due 2039 - 6.680% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 500,000,000   500,000,000
Gross carrying amount | Senior Notes Due 2039 - 6.750% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,450,000,000   1,450,000,000
Gross carrying amount | Senior Notes Due 2040 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 800,000,000   800,000,000
Gross carrying amount | Senior Notes Due 2041 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 400,000,000   400,000,000
Gross carrying amount | Senior Notes Due 2042 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,079,000,000   992,000,000
Gross carrying amount | Senior Notes Due 2043 - 4.500% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 719,000,000   661,000,000
Gross carrying amount | Senior Notes Due 2043 - 5.450% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 935,000,000   860,000,000
Gross carrying amount | Senior Notes Due 2044 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,511,000,000   1,389,000,000
Gross carrying amount | Senior Notes Due 2048 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,079,000,000   992,000,000
Gross carrying amount | Senior Notes Due 2049 - 4.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 300,000,000   300,000,000
Gross carrying amount | Senior Notes Due 2049 - 4.350% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,799,000,000   1,653,000,000
Gross carrying amount | Senior Notes Due 2049 - 3.700% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,439,000,000   1,323,000,000
Gross carrying amount | Senior Notes Due 2052 - 4.550% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 2,878,000,000   2,645,000,000
Gross carrying amount | Senior Notes Due 2052 - 5.250% | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 1,000,000,000   1,000,000,000
Gross carrying amount | Subordinated Notes Due 2081 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt 2,000,000,000   2,000,000,000
Gross carrying amount | Subordinated Notes Due 2082 | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Long-term debt $ 1,079,000,000   $ 992,000,000