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Fair Value of Financial Instruments and Risk Management - Fair Value Hierarchy (Details) - Recurring - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Assets    
Other investments $ 150 $ 145
Assets, total fair value 236 205
Liabilities    
Liabilities, total fair value (244) (218)
Energy contracts subject to regulatory deferral    
Assets    
Assets 63 49
Liabilities    
Liabilities (197) (209)
Energy contracts not subject to regulatory deferral    
Assets    
Assets 7 6
Liabilities    
Liabilities (2) (3)
Total return swaps and interest rate contracts    
Assets    
Assets 16  
Foreign exchange contracts and cross-currency interest rate swaps    
Liabilities    
Liabilities (45)  
Foreign exchange contracts    
Assets    
Assets   5
Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   (6)
Level 1    
Assets    
Other investments 150 145
Assets, total fair value 150 145
Liabilities    
Liabilities, total fair value 0 0
Level 1 | Energy contracts subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 1 | Energy contracts not subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 1 | Total return swaps and interest rate contracts    
Assets    
Assets 0  
Level 1 | Foreign exchange contracts and cross-currency interest rate swaps    
Liabilities    
Liabilities 0  
Level 1 | Foreign exchange contracts    
Assets    
Assets   0
Level 1 | Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   0
Level 2    
Assets    
Other investments 0 0
Assets, total fair value 86 60
Liabilities    
Liabilities, total fair value (244) (218)
Level 2 | Energy contracts subject to regulatory deferral    
Assets    
Assets 63 49
Liabilities    
Liabilities (197) (209)
Level 2 | Energy contracts not subject to regulatory deferral    
Assets    
Assets 7 6
Liabilities    
Liabilities (2) (3)
Level 2 | Total return swaps and interest rate contracts    
Assets    
Assets 16  
Level 2 | Foreign exchange contracts and cross-currency interest rate swaps    
Liabilities    
Liabilities (45)  
Level 2 | Foreign exchange contracts    
Assets    
Assets   5
Level 2 | Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   (6)
Level 3    
Assets    
Other investments 0 0
Assets, total fair value 0 0
Liabilities    
Liabilities, total fair value 0 0
Level 3 | Energy contracts subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 3 | Energy contracts not subject to regulatory deferral    
Assets    
Assets 0 0
Liabilities    
Liabilities 0 0
Level 3 | Total return swaps and interest rate contracts    
Assets    
Assets 0  
Level 3 | Foreign exchange contracts and cross-currency interest rate swaps    
Liabilities    
Liabilities $ 0  
Level 3 | Foreign exchange contracts    
Assets    
Assets   0
Level 3 | Total return and cross-currency interest rate swaps    
Liabilities    
Liabilities   $ 0