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Acquisitions and divestitures - Ferrous Resources Limited (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 01, 2019 | Dec. 31, 2019
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |
Net cash outflow |  | $ 926
Ferrous Resources Limited |  |
Disclosure of detailed information about business combination [line items] |  |
Percentage of voting interest acquired | 100.00% |
Cash consideration | $ 525 |
Amounts recognised as of acquisition date for each major class of assets acquired and liabilities assumed [abstract] |  |
Acquired assets | 706 |
Cash and cash equivalents | 95 |
Accounts receivable | 29 |
Inventories | 10 |
Intangibles | 5 |
Property, plant and equipment | 427 |
Others | 140 |
Assumed liabilities | (216) |
Net identifiable assets acquired | 490 |
Fair value adjustment on PP&E | 52 |
Deferred tax liability | (17) |
Total identifiable net assets at fair value | 525 |
Cash consideration transferred | 525 |
(-) Balances acquired, Cash and cash equivalents | 95 |
Net cash outflow | $ 430 |

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