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Schedule of changes in deferred income and social contribution taxes (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income And Social Contribution Taxes      
Deferred tax liability (asset) at beginning of period R$ 1,413 R$ 1,660 R$ 1,344
Effect allocated to other comprehensive income (102) 4 544
Effects allocated to net profit from continuing operations 210 (252) (145)
Effects allocated to net profit from discontinuing operations (note 34)     (85)
Others (2) 1 2
Deferred taxes arising from shareholding reorganization (16)    
Deferred tax liability (asset) at end of period R$ 1,503 R$ 1,413 R$ 1,660