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LONG-TERM DEBT - Summary of Long-term Debt (Details)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Mar. 11, 2022
CAD ($)
Mar. 11, 2022
USD ($)
Feb. 11, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about borrowings [line items]            
Long-term debt $ 29,905,000,000         $ 17,137,000,000
Deferred transaction costs and discounts (1,122,000,000)         (185,000,000)
Less current portion (1,828,000,000)         (1,551,000,000)
Senior Notes Due 2022            
Disclosure of detailed information about borrowings [line items]            
Principal amount           $ 1,450,000,000
Interest rate           5.34%
Senior Notes Due 2022 | 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 2022 | Floating interest rate            
Disclosure of detailed information about borrowings [line items]            
Principal amount $ 750,000,000 $ 750,000,000   $ 1,000,000,000 $ 750,000,000  
Senior Notes Due 2023 - 3.000% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Principal amount   $ 500,000,000        
Interest rate 3.00% 3.00%        
Senior Notes Due 2023 - 4.100% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Principal amount   $ 850,000,000        
Interest rate 4.10% 4.10%        
Senior Notes Due 2024 | 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 2025 - 2.950% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Principal amount   $ 1,000,000,000   $ 1,000,000,000    
Interest rate 2.95% 2.95% 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   $ 1,250,000,000      
Interest rate 3.10% 3.10% 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 | 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 - 3.200% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Principal amount   $ 1,300,000,000   $ 1,300,000,000    
Interest rate 3.20% 3.20% 3.20% 3.20%    
Senior Notes Due 2029 - 3.750% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Principal amount $ 1,000,000,000   $ 1,000,000,000      
Interest rate 3.75% 3.75% 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 2032 - 3.800% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Principal amount   $ 2,000,000,000   $ 2,000,000,000    
Interest rate 3.80% 3.80% 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   $ 1,000,000,000      
Interest rate 4.25% 4.25% 4.25% 4.25%    
Senior Debentures Due 2032 | 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 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 | 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 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   $ 750,000,000    
Interest rate 4.50% 4.50% 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 - 4.350% | 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   $ 2,000,000,000    
Interest rate 4.55% 4.55% 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   $ 1,000,000,000      
Interest rate 5.25% 5.25% 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 $ 32,855,000,000         $ 18,873,000,000
Gross carrying amount | Senior Notes Due 2022 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 0         600,000,000
Gross carrying amount | Senior Notes Due 2022 | Floating interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 0         951,000,000
Gross carrying amount | Senior Notes Due 2023 - 3.000% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 677,000,000         634,000,000
Gross carrying amount | Senior Notes Due 2023 - 4.100% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 1,151,000,000         1,078,000,000
Gross carrying amount | Senior Notes Due 2024 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 600,000,000         600,000,000
Gross carrying amount | Senior Notes Due 2025 - 2.950% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 1,354,000,000         0
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         0
Gross carrying amount | Senior Notes Due 2025 3.625% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 948,000,000         886,000,000
Gross carrying amount | Senior Notes Due 2026 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 677,000,000         634,000,000
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 - 3.200% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 1,761,000,000         0
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         0
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 2032 - 3.800% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 2,709,000,000         0
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         0
Gross carrying amount | Senior Debentures Due 2032 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 271,000,000         254,000,000
Gross carrying amount | Senior Notes Due 2038 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 474,000,000         444,000,000
Gross carrying amount | Senior Notes Due 2039 | 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 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 1,016,000,000         0
Gross carrying amount | Senior Notes Due 2043 - 4.500% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 677,000,000         634,000,000
Gross carrying amount | Senior Notes Due 2043 - 5.450% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 880,000,000         823,000,000
Gross carrying amount | Senior Notes Due 2044 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 1,422,000,000         1,331,000,000
Gross carrying amount | Senior Notes Due 2048 | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 1,016,000,000         951,000,000
Gross carrying amount | Senior Notes Due 2049 - 4.350% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 1,693,000,000         1,585,000,000
Gross carrying amount | Senior Notes Due 2049 - 3.700% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 1,354,000,000         1,268,000,000
Gross carrying amount | Senior Notes Due 2052 - 4.550% | Fixed interest rate            
Disclosure of detailed information about borrowings [line items]            
Long-term debt 2,709,000,000         0
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         0
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 $ 1,016,000,000         $ 0