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Schedule of operating provision (reversals) (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Costs And Expenses      
Estimated losses on doubtful accounts receivables R$ 144 R$ 147 R$ 238
Estimated losses on other accounts receivables 21   11
Estimated losses on accounts receivables from related parties   37 688
Labor claims 35 46 136
Civil 54 43 24
Tax 2 75 1,228
Other 19 22 12
Other provisions 110 186 1,400
Operating provision (Reversals) 275 370 2,337
Provision for losses 100 53 64
Operating provision (reversals) and adjustment for losses , Total R$ 375 R$ 423 R$ 2,401