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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2022
Cash and cash equivalents [abstract]  
Schedule of cash and cash equivalents
          
   12.31.22   12.31.21 
Cash and banks   867    2,957 
Time deposits   —      595 
Mutual funds   763    2,627 
Total cash and cash equivalents   1,630    6,179