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Financial assets and liabilities (Tables)
 12 Months Ended
Dec. 31, 2023
Notes and other explanatory information [abstract]  
Schedule of financial instruments classification based on its recognition
                 
    December 31, 2023 December 31, 2022
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 23 3,609 - - 3,609 4,736 - - 4,736
Short-term investments 23 - - 51 51 - - 61 61
Derivative financial instruments 20 - - 271 271 - - 342 342
Accounts receivable 11 362 - 3,835 4,197 538 - 3,781 4,319
    3,971 - 4,157 8,128 5,274 - 4,184 9,458
Non-current                  
Judicial deposits 28(d) 798 - - 798 1,215 - - 1,215
Restricted cash 14 4 - - 4 77 - - 77
Derivative financial instruments 20 - - 544 544 - - 196 196
Investments in equity securities 14 - 45 - 45 - 7 - 7
    802 45 544 1,391 1,292 7 196 1,495
Total of financial assets   4,773 45 4,701 9,519 6,566 7 4,380 10,953
                   
Financial liabilities                  
Current                  
Suppliers and contractors 13 5,272 - - 5,272 4,461 - - 4,461
Derivative financial instruments 20 - - 36 36 - - 90 90
Loans and borrowings 23 824 - - 824 307 - - 307
Leases 24 197 - - 197 182 - - 182
Liabilities related to the concession grant 14(a) 591 - - 591 416 - - 416
Other financial liabilities - Related parties 31 290 - - 290 400 - - 400
Contract liability and financial liabilities 14 759 - - 759 766 - - 766
    7,933 - 36 7,969 6,532 - 90 6,622
Non-current                  
Derivative financial instruments 20 - - 95 95 - - 186 186
Loans and borrowings 23 11,647 - - 11,647 10,874 - - 10,874
Leases 24 1,255 - - 1,255 1,349 - - 1,349
Participative shareholders' debentures 22 - - 2,874 2,874 - - 2,725 2,725
Liabilities related to the concession grant 14(a) 3,278 - - 3,278 2,554 - - 2,554
Financial guarantees 32 - - - - - - 103 103
    16,180 - 2,969 19,149 14,777 - 3,014 17,791
Total of financial liabilities   24,113 - 3,005 27,118 21,309 - 3,104 24,413
Schedule of assets and liabilities measured and recognized at fair value
                 
    December 31, 2023 December 31, 2022
  Notes Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total
Financial assets                  
Short-term investments 23 51 - - 51 61 - - 61
Derivative financial instruments 20 - 815 - 815 - 538 - 538
Accounts receivable 11 - 3,835 - 3,835 - 3,781 - 3,781
Investments in equity securities 14 - 45 - 45 - 7 - 7
    51 4,695 - 4,746 61 4,326 - 4,387
                   
Financial liabilities                  
Derivative financial instruments 20 - 131 - 131 - 276 - 276
Participative shareholders' debentures 22 - 2,874 - 2,874 - 2,725 - 2,725
Financial guarantees 32 - - - - - 103 - 103
    - 3,005 - 3,005 - 3,104 - 3,104
Schedule of fair value and carrying amounts of loans and financing
       
  December 31, 2023 December 31, 2022
  Carrying amount Fair value Carrying amount Fair value
Quoted in the secondary market:        
Bonds 7,253 7,404 6,256 6,253
Debentures 221 213 240 225
Debt contracts in Brazil in:        
R$, indexed to TJLP, TR, IPCA, IGP-M and CDI 250 250 280 278
R$, with fixed interest - - 2 2
Basket of currencies and bonds in US$ indexed to SOFR 153 168 - -
Debt contracts in the international market in:        
US$, with variable and fixed interest 4,504 4,950 4,304 4,391
Other currencies, with variable interest 9 9 9 9
Other currencies, with fixed interest 81 85 90 91
  12,471 13,079 11,181 11,249