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Risk Management - Summary of Principal Assumptions on Provisions Valuation (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
PCBs    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.37% 1.06%
Discount rate 1.88% 1.83%
Nuclear plants    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.41% 1.07%
Discount rate 2.20% 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%