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Accounts receivable (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounts receivable |  |  |
Accounts receivable | $ 4,993 | $ 2,529 |
Impairment of accounts receivable recorded in the income statement | $ 5 | $ (1) | $ (7)
Steel industry market |  |  |
Accounts receivable |  |  |
Perecentage of revenue | 87.25% | 87.33% |
One Customer | Ferrous minerals |  |  |
Accounts receivable |  |  |
Perecentage of revenue | 10.10% |  |
Accounts receivable |  |  |
Accounts receivable |  |  |
Expected credit loss | $ (50) | $ (63) |
Carrying amount |  |  |
Accounts receivable |  |  |
Accounts receivable | $ 5,043 | $ 2,592 |

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