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Cash and cash equivalents and marketable securities (Tables)
 12 Months Ended
Dec. 31, 2023
Cash And Cash Equivalents And Marketable Securities  
Schedule of cash and cash equivalents
   
  12.31.2023 12.31.2022
Cash at bank and in hand 103 216
Short-term financial investments    
- In Brazil    
Brazilian interbank deposit rate investment funds and other short-term deposits 1,742 2,763
Other investment funds 279 244
  2,021 3,007
- Abroad    
Time deposits 7,737 2,388
Automatic investing accounts and interest checking accounts 2,852 2,365
Other financial investments 14 20
  10,603 4,773
Total short-term financial investments 12,624 7,780
Total cash and cash equivalents 12,727 7,996
Schedule of marketable securities
           
      12.31.2023     12.31.2022
  In Brazil Abroad Total In Brazil Abroad Total
Fair value through profit or loss 926 − 926 713 − 713
Amortized cost - Bank Deposit Certificates and time deposits 4,249 − 4,249 2,548 1,026 3,574
Amortized cost - Others 53 − 53 50 − 50
Total 5,228 − 5,228 3,311 1,026 4,337
Current 2,819 − 2,819 1,747 1,026 2,773
Non-current 2,409 − 2,409 1,564 − 1,564