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Material Accounting Policies - Remaining Useful Lives Of Asset Class (Details)
 12 Months Ended
Dec. 31, 2024
Hydro generation | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 1 year
Hydro generation | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 48 years
Wind and Solar generation | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 1 year
Wind and Solar generation | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 30 years
Gas generation | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 1 year
Gas generation | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 33 years
Energy Transition | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 1 year
Energy Transition | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 9 years
Capital spares and other | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 1 year
Capital spares and other | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life measured as period of time, property, plant and equipment 48 years