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Costs and expenses by nature - Cost of goods sold and services (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Costs and expenses by nature        
Personnel $ 444 $ 362 $ 834 $ 775
Materials and services 819 748 1,521 1,553
Fuel oil and gas 267 206 475 485
Maintenance 800 616 1,449 1,286
Royalties 353 168 604 332
Energy 169 147 318 336
Ores acquired from third parties 691 199 1,034 261
Depreciation, depletion and amortization 800 734 1,488 1,463
Freight 991 691 1,773 1,387
Others 471 341 936 612
Total 5,805 4,212 10,432 8,490
Cost of goods sold 5,663 4,086 10,156 8,203
Cost of services rendered 142 126 276 287
Total $ 5,805 $ 4,212 $ 10,432 $ 8,490