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Accounts receivable (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Accounts receivable |  |  |  |  |
Accounts receivable | $ 4,954 |  | $ 4,954 |  | $ 4,993
Impairment of accounts receivable recorded in the income statement | 3 | $ (3) | $ 2 | $ 9 |
Steel industry market |  |  |  |  |
Accounts receivable |  |  |  |  |
Percentage of revenue |  |  | 89.27% |  | 87.25%
One Customer | Ferrous minerals |  |  |  |  |
Accounts receivable |  |  |  |  |
Percentage of revenue |  |  |  |  | 10.10%
Accounts receivable |  |  |  |  |
Accounts receivable |  |  |  |  |
Expected credit loss | (48) |  | $ (48) |  | $ (50)
Carrying amount |  |  |  |  |
Accounts receivable |  |  |  |  |
Accounts receivable | $ 5,002 |  | $ 5,002 |  | $ 5,043

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