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Valuation adjustments (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Adjustments to actuarial liabilities – Employee benefits R$ (329) R$ (340) R$ (343)
Subsidiary and jointly controlled entity      
Adjustments to actuarial liabilities – Employee benefits (2,433) (2,660) (2,650)
Deemed cost of PP&E 554 569 586
 Total (1,879) (2,091) (2,064)
Valuation adjustments R$ (2,208) R$ (2,431) R$ (2,407)