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Risk Management - Summary of Principal Assumptions on Provisions Valuation (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
PCBs | Inflation Rate, Measurement Input [Member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 2.80% 2.40%
PCBs | Discount rate, measurement input [member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Discount rate 2.9 2.12
Nuclear plants | Inflation Rate, Measurement Input [Member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 2.02% 1.91%
Nuclear plants | Discount rate, measurement input [member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Discount rate 2.78 2.76
Spent fuel | Inflation Rate, Measurement Input [Member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.91% 1.91%
Spent fuel | Discount rate, measurement input [member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Discount rate 2.49 2.49
Radioactive waste | Inflation Rate, Measurement Input [Member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 3.32% 3.89%
Radioactive waste | Discount rate, measurement input [member]    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Discount rate 4.17 3.65