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Acquisitions and divestitures - Fair values of identifiable assets acquired and liabilities (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 22, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Fair values of identifiable assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 13,649 | $ 13,649 | $ 13,649 | $ 13,487 | $ 12,883 | $ 12,113 | $ 11,788 | $ 7,350
Net cash outflow |  |  | 2,345 | 2,345 |  |  |  |  |
Reclassification of cumulative translation adjustment to net income |  |  | 424 | 1,542 |  |  |  |  |
Nacala Logistics Corridor |  |  |  |  |  |  |  |  |
Fair values of identifiable assets acquired and liabilities assumed |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 172 |  |  |  |  |  |  |  |
Inventory, recoverable tax and other assets | 423 |  |  |  |  |  |  |  |
Intangibles | 2,219 |  |  |  |  |  |  |  |
Property, plant and equipment | 1,363 |  |  |  |  |  |  |  |
Assumed liabilities | (158) |  |  |  |  |  |  |  |
Net identifiable assets acquired | 4,019 |  |  |  |  |  |  |  |
Fair value adjustments (i) | (1,590) |  |  |  |  |  |  |  |
Total identifiable net assets at fair value (ii) | 2,429 |  |  |  |  |  |  |  |
Pre-existing relationship (Loans receivable from NLC) | 859 |  |  |  |  |  |  |  |
Loss on pre-existing relationship | (771) | $ (771) |  | $ (771) | $ (798) |  |  |  |
Best estimate at acquisition date of contractual cash flows not expected to be collected for acquired receivables | 2,517 |  |  |  |  |  |  |  |
Cash consideration | 2,517 |  |  |  |  |  |  |  |
(-) Balances acquired, Cash and cash equivalents | 172 |  |  |  |  |  |  |  |
Cash and cash equivalents | 172 |  |  |  |  |  |  |  |
Net cash outflow | 2,345 |  |  |  |  |  |  |  |
Property, plant and equipment, fair value adjustments | 441 |  |  |  |  |  |  |  |
Intangible assets, fair value adjustments | $ 791 |  |  |  |  |  |  |  |
Reclassification of cumulative translation adjustment to net income |  |  | $ 424 |  |  |  |  |  |

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- Definition The best estimate at acquisition date of contractual cash flows not expected to be collected for receivables acquired in business combinations. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B64 -Subparagraph h -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_h_iii&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2020-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2020-01-01 + Details
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