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Principal assumptions on provisions valuation (Details)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
PCBs    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.09% 1.27%
Discount rate 1.97% 2.18%
Nuclear plants    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 1.10% 1.21%
Discount rate 2.43% 2.94%
Spent fuel    
Disclosure of Principal assumptions on provisions valuation [Line Items]    
Inflation rate 2.93% 2.93%
Discount rate 4.49% 4.49%