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Financial assets and liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Financial instruments classification    
Total current financial assets $ 19,768 $ 19,580
Total noncurrent financial assets 2,756 3,052
Total of financial assets 22,524 22,632
Total current financial liabilities 6,343 7,629
Total noncurrent financial liabilities 20,584 21,868
Total of financial liabilities 26,927 29,497
Amortized cost    
Financial instruments classification    
Total current financial liabilities 6,139 7,301
Total noncurrent financial liabilities 14,826 16,889
Total of financial liabilities 20,965 24,190
At fair value through profit or loss    
Financial instruments classification    
Total current financial liabilities 204 328
Total noncurrent financial liabilities 5,758 4,979
Total of financial liabilities 5,962 5,307
Amortized cost    
Financial instruments classification    
Total current financial assets 15,915 15,196
Total noncurrent financial assets 1,451 2,229
Total of financial assets 17,366 17,425
At fair value through OCI    
Financial instruments classification    
Total noncurrent financial assets 1,097 757
Total of financial assets 1,097 757
At fair value through profit or loss    
Financial instruments classification    
Total current financial assets 3,853 4,384
Total noncurrent financial assets 208 66
Total of financial assets 4,061 4,450
Cash and cash equivalents    
Financial instruments classification    
Total current financial assets 13,649 13,487
Cash and cash equivalents | Amortized cost    
Financial instruments classification    
Total current financial assets 13,649 13,487
Short-term investments    
Financial instruments classification    
Total current financial assets 951 771
Short-term investments | At fair value through profit or loss    
Financial instruments classification    
Total current financial assets 951 771
Financial instruments classification    
Financial instruments classification    
Total current financial assets 214 134
Financial instruments classification | At fair value through profit or loss    
Financial instruments classification    
Total current financial assets 214 134
Accounts receivable    
Financial instruments classification    
Total current financial assets 4,954 4,993
Accounts receivable | Amortized cost    
Financial instruments classification    
Total current financial assets 2,266 1,514
Accounts receivable | At fair value through profit or loss    
Financial instruments classification    
Total current financial assets 2,688 3,479
Related parties    
Financial instruments classification    
Total current financial assets   195
Related parties | Amortized cost    
Financial instruments classification    
Total current financial assets   195
Judicial deposits    
Financial instruments classification    
Total noncurrent financial assets 1,326 1,268
Judicial deposits | Amortized cost    
Financial instruments classification    
Total noncurrent financial assets 1,326 1,268
Restricted cash    
Financial instruments classification    
Total noncurrent financial assets 125 38
Restricted cash | Amortized cost    
Financial instruments classification    
Total noncurrent financial assets 125 38
Financial instruments classification    
Financial instruments classification    
Total noncurrent financial assets 208 66
Financial instruments classification | At fair value through profit or loss    
Financial instruments classification    
Total noncurrent financial assets 208 66
Investments in equity securities    
Financial instruments classification    
Total noncurrent financial assets 1,097 757
Investments in equity securities | At fair value through OCI    
Financial instruments classification    
Total noncurrent financial assets 1,097 757
Related parties    
Financial instruments classification    
Total noncurrent financial assets   923
Related parties | Amortized cost    
Financial instruments classification    
Total noncurrent financial assets   923
Suppliers and contractors    
Financial instruments classification    
Total current financial liabilities 3,777 3,367
Suppliers and contractors | Amortized cost    
Financial instruments classification    
Total current financial liabilities 3,777 3,367
Liabilities related to the concession grant    
Financial instruments classification    
Total current financial liabilities 350 209
Total noncurrent financial liabilities 1,956 2,103
Financial instruments classification    
Financial instruments classification    
Total current financial liabilities 204 328
Financial instruments classification | At fair value through profit or loss    
Financial instruments classification    
Total current financial liabilities 204 328
Loans and borrowings    
Financial instruments classification    
Total current financial liabilities 992 1,136
Loans and borrowings | Amortized cost    
Financial instruments classification    
Total current financial liabilities 992 1,136
Interest on capital    
Financial instruments classification    
Total current financial liabilities 27 1,220
Interest on capital | Amortized cost    
Financial instruments classification    
Total current financial liabilities 27 1,220
Related parties    
Financial instruments classification    
Total current financial liabilities 188 725
Related parties | Amortized cost    
Financial instruments classification    
Total current financial liabilities 188 725
Financial instruments classification    
Financial instruments classification    
Total noncurrent financial liabilities 521 689
Financial instruments classification | At fair value through profit or loss    
Financial instruments classification    
Total noncurrent financial liabilities 521 689
Loans and borrowings    
Financial instruments classification    
Total noncurrent financial liabilities 12,870 13,891
Loans and borrowings | Amortized cost    
Financial instruments classification    
Total noncurrent financial liabilities 12,870 13,891
Related parties    
Financial instruments classification    
Total noncurrent financial liabilities   895
Related parties | Amortized cost    
Financial instruments classification    
Total noncurrent financial liabilities   895
Other financial liabilities    
Financial instruments classification    
Total current financial liabilities 805 644
Participative stockholders' debentures    
Financial instruments classification    
Total noncurrent financial liabilities 4,687 3,413
Participative stockholders' debentures | At fair value through profit or loss    
Financial instruments classification    
Total noncurrent financial liabilities 4,687 3,413
Financial guarantees    
Financial instruments classification    
Total noncurrent financial liabilities $ 550 $ 877