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Participative stockholders' debentures (Details)
R$ / shares in Units, R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2021
BRL (R$)
Dec. 31, 2021
BRL (R$)
R$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
R$ / shares
Participative stockholders' debentures          
Number of debentures issued | shares 388,559,056   388,559,056    
Remuneration paid to the participative stockholders debentures $ 225 R$ 1,244      
Average Price Per Debenture | R$ / shares     R$ 49.10   R$ 45.65
Expense Related To Debenture 716 R$ 3,691      
Liability Related To Debenture 3,419   R$ 19,078 $ 3,413 R$ 17,737
Participative Stockholders Debentures | $ $ 3,419     $ 3,413