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Risk Management - Summary of Principal Assumptions on Provisions Valuation (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
PCBs    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 2.40% 1.98%
Discount rate 2.12% 1.92%
Nuclear plants    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.91% 2.25%
Discount rate 2.76% 2.48%
Spent fuel    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.91% 2.93%
Discount rate 2.49% 4.49%
Radioactive waste    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 3.89% 3.06%
Discount rate 3.65% 2.62%