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Other financial assets and liabilities (Details)
$ in Millions, R$ in Billions
12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Other financial assets        
Derivative financial instruments- current   $ 134   $ 288
Related parties - Loans - Current   195   319
Total other financial assets - Current   329   607
Restricted cash-noncurrent   38   151
Derivative financial instruments - Non-Current   66   184
Investments in equity securities -Non- Current   757   726
Related parties - Loans - Non-current   923   1,600
Total other financial assets - Non-Current   1,784   2,661
Other financial liabilities        
Derivative financial instruments - Current   328   94
Related parties - Current   725   980
Advance received-Current   644   330
Liabilities related to the concession grant-Current   209    
Total other financial liabilities - Current   1,906   1,404
Derivative financial instruments - Non-Current   689   307
Related parties- Non-Current   943   956
Financial guarantees provided -Non current   877   525
Liabilities related to the concession grant-Non current   2,103    
Total other financial liabilities - Non-Current   $ 4,612   1,788
Number of debentures issued (in shares) | shares   388,559,056    
Remuneration paid to the participative stockholders debentures R$ 1 $ 183 R$ 776 $ 194