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CONSOLIDATED FINANCIAL STATEMENTS - Associate companies (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest in Associate companies      
Net income R$ 15,558,938 R$ 2,388,054 R$ 1,216,887
Total comprehensive income (loss) recognized in the year 16,812,883 4,653,996 1,589,369
Associate companies      
Interest in Associate companies      
Net income 37,231 42,008 31,249
Total comprehensive income (loss) recognized in the year R$ 37,231 R$ 42,008 R$ 31,249
Dona Francisca Energtica S.A.      
Interest in Associate companies      
Equity Interests (as a percent) 51.82% 51.82% 51.82%