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18 Intangible assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets R$ 6,929,456 R$ 6,332,611  
Distribution Concession Agreement [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 6,203,387 5,703,686  
Generation Concession Agreement [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 553,840 582,671 R$ 593,852
Gas Distribution [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets 132,366 R$ 3,619
Other [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible Assets R$ 39,863 R$ 46,254