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Schedule of reconciliation of statutory on income and social contribution Ttxes (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income And Social Contribution Taxes    
Profit before income tax and social contribution tax R$ 4,699 R$ 3,800
Income tax and social contribution tax — nominal expense (34%) R$ (1,597) (1,292)
Income tax and Social Contribution tax rate 34.00%  
Tax effects applicable to:    
Gain in subsidiaries by equity method R$ 6 93
Interest on Equity 325 188
Tax incentives 63 39
Effects from subsidiaries taxed based on gross revenues 146 97
Non-deductible penalties (23) (25)
Impairment of accounts receivable from related parties (13)
Income arising from the Light sale 154
Others (20) (23)
Income tax and social contribution tax — effective expense (946) (936)
Current tax (1,156) (684)
Deferred tax R$ 210 R$ (252)
Effective rate 20.12% 24.62%