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Principal assumptions on provisions valuation (Details)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
PCBs    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.06% 1.09%
Discount rate 1.83% 1.97%
Nuclear plants    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.07% 1.10%
Discount rate 2.20% 2.43%
Spent fuel    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 2.93% 2.93%
Discount rate 4.49% 4.49%