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Credit Facilities, Long-Term Debt and Lease Liabilities - Principal Repayments (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]    
Principal repayments $ 3,808 $ 3,466
Cost    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 3,692  
Lease liabilities 151  
Cost | 2025    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 566  
Lease liabilities 4  
Cost | 2026    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 169  
Lease liabilities 5  
Cost | 2027    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 331  
Lease liabilities 5  
Cost | 2028    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 309  
Lease liabilities 5  
Cost | 2029    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 824  
Lease liabilities 5  
Cost | 2030 and thereafter    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 1,493  
Lease liabilities $ 127