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Financial assets and liabilities (Tables)
 12 Months Ended
Dec. 31, 2024
Notes and other explanatory information [abstract]  
Schedule of financial instruments classification based on its recognition
                 
    December 31, 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 24 4,953 - - 4,953 3,609 - - 3,609
Short-term investments 24 - - 53 53 - - 51 51
Derivative financial instruments 21 - - 53 53 - - 271 271
Accounts receivable 12 374 - 1,984 2,358 362 - 3,835 4,197
    5,327 - 2,090 7,417 3,971 - 4,157 8,128
Non-current                  
Judicial deposits 29(c) 537 - - 537 798 - - 798
Restricted cash 15 13 - - 13 4 - - 4
Derivative financial instruments 21 - - 15 15 - - 544 544
Investments in equity securities 15 - 54 - 54 - 45 - 45
    550 54 15 619 802 45 544 1,391
Total of financial assets   5,877 54 2,105 8,036 4,773 45 4,701 9,519
                   
Financial liabilities                  
Current                  
Suppliers and contractors 14 4,234 - - 4,234 5,272 - - 5,272
Derivative financial instruments 21 - - 197 197 - - 36 36
Loans and borrowings 24 1,020 - - 1,020 824 - - 824
Leases 25 147 - - 147 197 - - 197
Liabilities related to the concession grant 15(a) 467 - - 467 591 - - 591
Other financial liabilities - Related parties 32 291 - - 291 290 - - 290
Contract liability and financial liabilities 15 588 - - 588 759 - - 759
    6,747 - 197 6,944 7,933 - 36 7,969
Non-current                  
Derivative financial instruments 21 - - 428 428 - - 95 95
Loans and borrowings 24 13,772 - - 13,772 11,647 - - 11,647
Leases 25 566 - - 566 1,255 - - 1,255
Participative shareholders' debentures 23 - - 2,217 2,217 - - 2,874 2,874
Liabilities related to the concession grant 15(a) 1,887 - - 1,887 3,278 - - 3,278
Other financial liabilities   32 - - 32 - - - -
    16,257 - 2,645 18,902 16,180 - 2,969 19,149
Total of financial liabilities   23,004 - 2,842 25,846 24,113 - 3,005 27,118
Schedule of assets and liabilities measured and recognized at fair value
                 
    December 31, 2024 December 31, 2023
  Notes Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
Financial assets                  
Short-term investments 24 53 - - 53 51 - - 51
Derivative financial instruments 21 - 68 - 68 - 815 - 815
Accounts receivable 12 - 1,984 - 1,984 - 3,835 - 3,835
Investments in equity securities 15 - 54 - 54 - 45 - 45
    53 2,106 - 2,159 51 4,695 - 4,746
                   
Financial liabilities                  
Derivative financial instruments 21 - 625 - 625 - 131 - 131
Participative shareholders' debentures 23 - 2,217 - 2,217 - 2,874 - 2,874
    - 2,842 - 2,842 - 3,005 - 3,005
Schedule of fair value and carrying amounts of loans and financing
       
  December 31, 2024 December 31, 2023
  Carrying amount Fair value Carrying amount Fair value
Quoted in the secondary market:        
Bonds 7,267 7,245 7,253 7,404
Debentures 1,272 1,275 221 213
Debt contracts in Brazil in:        
R$, indexed to TJLP, TR, IPCA, IGP-M and CDI 185 185 250 250
Basket of currencies and bonds in US$ indexed to SOFR 152 155 153 168
Debt contracts in the international market in:        
US$, with variable and fixed interest 5,844 5,922 4,504 4,950
Other currencies, with variable interest 9 8 9 9
Other currencies, with fixed interest 63 64 81 85
  14,792 14,854 12,471 13,079