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FV Measurements (Quantitative Information About Significant Unobservable Inputs Used in Level 3 Measurements) (Details) - CAD ($)
Dec. 31, 2024
Dec. 31, 2023
Assets    
Total assets $ 166,000,000 $ 240,000,000
Liabilities    
Total liabilities 617,000,000 504,000,000
Level 3    
Assets    
Total assets 32,000,000 34,000,000
Liabilities    
Total liabilities 441,000,000 365,000,000
Net liability 409,000,000 331,000,000
Level 3 | HFT derivatives | Power swaps and physical contracts    
Assets    
Total assets 5,000,000  
Liabilities    
Total liabilities 4,000,000  
Level 3 | HFT derivatives | Natural gas swaps, futures, forwards and physical contracts    
Assets    
Total assets 27,000,000 34,000,000
Liabilities    
Total liabilities $ 437,000,000 $ 365,000,000
Level 3 | HFT derivatives | Range, Minimum | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 25.60  
Level 3 | HFT derivatives | Range, Minimum | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 2.20 1.27
Level 3 | HFT derivatives | Range, Maximum | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 139.65  
Level 3 | HFT derivatives | Range, Maximum | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 17.54 16.25
Level 3 | HFT derivatives | Weighted average | Power swaps and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 82.63  
Level 3 | HFT derivatives | Weighted average | Natural gas swaps, futures, forwards and physical contracts | Third-party pricing    
Liabilities    
Derivative, measurement input 8.57 4.85