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Debt and Capital Structure - Mandatory Debt Payments (Details) - Long-Term Debt
$ in Millions, $ 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]        
Total debt principal $ 7,470   $ 7,028  
Total Debt Principal, (CAD equivalent) 7,470   7,028  
2025        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 192      
2026        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
2027        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 1,287      
2028        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 1,250      
2029        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 262      
Thereafter        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 4,479      
U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal 5,470 $ 3,800 5,028 $ 3,800
Total Debt Principal, (CAD equivalent) 5,470   5,028  
U.S. Dollar Denominated Unsecured Notes | 2025        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   133    
Total Debt Principal, (CAD equivalent) 192      
U.S. Dollar Denominated Unsecured Notes | 2026        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   0    
Total Debt Principal, (CAD equivalent) 0      
U.S. Dollar Denominated Unsecured Notes | 2027        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   373    
Total Debt Principal, (CAD equivalent) 537      
U.S. Dollar Denominated Unsecured Notes | 2028        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   0    
Total Debt Principal, (CAD equivalent) 0      
U.S. Dollar Denominated Unsecured Notes | 2029        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   183    
Total Debt Principal, (CAD equivalent) 262      
U.S. Dollar Denominated Unsecured Notes | Thereafter        
Disclosure of detailed information about borrowings [line items]        
Total debt principal   $ 3,113    
Total Debt Principal, (CAD equivalent) 4,479      
Canadian Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total debt principal 2,000   $ 2,000  
Total Debt Principal, (CAD equivalent) 2,000      
Canadian Dollar Denominated Unsecured Notes | 2025        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
Canadian Dollar Denominated Unsecured Notes | 2026        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
Canadian Dollar Denominated Unsecured Notes | 2027        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 750      
Canadian Dollar Denominated Unsecured Notes | 2028        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 1,250      
Canadian Dollar Denominated Unsecured Notes | 2029        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 0      
Canadian Dollar Denominated Unsecured Notes | Thereafter        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) $ 0