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Financial assets and liabilities (Tables)
 6 Months Ended
Jun. 30, 2024
Notes and other explanatory information [abstract]  
Schedule of financial instruments classification based on its recognition
     
    June 30, 2024 December 31, 2023
Financial assets Notes Amortized cost At fair value through OCI At fair value through profit or loss Total Amortized cost At fair value through OCI At fair value through profit or loss Total
Current                  
Cash and cash equivalents 21 6,479 - - 6,479 3,609 - - 3,609
Short-term investments 21 - - 61 61 - - 51 51
Derivative financial instruments 18 - - 168 168 - - 271 271
Accounts receivable 10 409 - 1,923 2,332 362 - 3,835 4,197
Judicial deposits 26(c) - - - - 611 - - 611
    6,888 - 2,152 9,040 4,582 - 4,157 8,739
Non-current                  
Judicial deposits 26(c) 585 - - 585 798 - - 798
Restricted cash 13 4 - - 4 4 - - 4
Derivative financial instruments 18 - - 109 109 - - 544 544
Investments in equity securities 13 - 47 - 47 - 45 - 45
    589 47 109 745 802 45 544 1,391
Total of financial assets   7,477 47 2,261 9,785 5,384 45 4,701 10,130
                   
Financial liabilities                  
Current                  
Suppliers and contractors 12 4,769 - - 4,769 5,272 - - 5,272
Derivative financial instruments 18 - - 135 135 - - 36 36
Loans and borrowings 21 910 - - 910 824 - - 824
Leases 22 177 - - 177 197 - - 197
Liabilities related to the concession grant 13(a) 745 - - 745 591 - - 591
Other financial liabilities - Related parties 29 144 - - 144 290 - - 290
Advances and other financial obligations 13 508 - - 508 759 - - 759
    7,253 - 135 7,388 7,933 - 36 7,969
Non-current                  
Derivative financial instruments 18 - - 105 105 - - 95 95
Loans and borrowings 21 12,860 - - 12,860 11,647 - - 11,647
Leases 22 1,183 - - 1,183 1,255 - - 1,255
Participative shareholders' debentures 20 - - 2,451 2,451 - - 2,874 2,874
Liabilities related to the concession grant 13(a) 2,979 - - 2,979 3,278 - - 3,278
    17,022 - 2,556 19,578 16,180 - 2,969 19,149
Total of financial liabilities   24,275 - 2,691 26,966 24,113 - 3,005 27,118
Schedule of assets and liabilities measured and recognized at fair value
     
    June 30, 2024 December 31, 2023
  Notes Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
Financial assets                  
Short-term investments 21 61 - - 61 51 - - 51
Derivative financial instruments 18 - 277 - 277 - 815 - 815
Accounts receivable 10 - 1,923 - 1,923 - 3,835 - 3,835
Investments in equity securities 13 - 47 - 47 - 45 - 45
    61 2,247 - 2,308 51 4,695 - 4,746
                   
Financial liabilities                  
Derivative financial instruments 18 - 240 - 240 - 131 - 131
Participative shareholders' debentures 20 - 2,451 - 2,451 - 2,874 - 2,874
    - 2,691 - 2,691 - 3,005 - 3,005
Schedule of fair value and carrying amounts of loans and financing
   
  June 30, 2024 December 31, 2023
  Carrying amount Fair value Carrying amount Fair value
Quoted in the secondary market:        
Bonds 8,253 8,227 7,253 7,404
Debentures 117 117 221 213
Debt contracts in Brazil in:        
R$, indexed to TJLP, TR, IPCA, IGP-M and CDI 196 196 250 250
Basket of currencies and bonds in US$ indexed to SOFR 153 163 153 168
Debt contracts in the international market in:        
US$, with variable and fixed interest 4,976 5,296 4,504 4,950
Other currencies, with variable interest 9 8 9 9
Other currencies, with fixed interest 66 69 81 85
Total 13,770 14,076 12,471 13,079