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Risk Management - Summary of Principal Assumptions on Provisions Valuation (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
PCBs    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.98% 1.37%
Discount rate 1.92% 1.88%
Nuclear plants    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 2.25% 1.41%
Discount rate 2.48% 2.20%
Spent fuel    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 2.93% 2.93%
Discount rate 4.49% 4.49%
Radioactive waste    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 3.06% 1.00%
Discount rate 2.62% 1.87%