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Debt and Capital Structure - Schedule of Long-Term Debt (Details)
$ in Millions, $ in Billions
Sep. 30, 2025
CAD ($)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]        
Net Debt Premiums (Discounts) and Transaction Costs $ 49   $ 64  
Long-Term Debt 7,156   7,534  
Less: Current Portion 0   192  
Long-Term Debt 7,156   7,342  
Long-Term Debt        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 7,107   7,470  
Long-Term Debt | Revolving Term Debt        
Disclosure of detailed information about borrowings [line items]        
Revolving Term Debt 0   0  
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) 5,107 $ 3.7 5,470 $ 3.8
Long-Term Debt | Canadian Dollar Unsecured Notes        
Disclosure of detailed information about borrowings [line items]        
Total Debt Principal, (CAD equivalent) $ 2,000   $ 2,000