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ACQUISITIONS - Schedule of acquisition date fair values (Details) € in Millions, £ in Millions, $ in Millions | May 09, 2022 EUR (€) | May 09, 2022 USD ($) | Jun. 30, 2022 USD ($) | May 09, 2022 USD ($) | May 02, 2022 GBP (£) | May 02, 2022 USD ($) | Feb. 28, 2022 GBP (£) | Feb. 28, 2022 USD ($)
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JLM |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  | $ 10
Property, plant and equipment |  |  |  |  |  |  |  | 10
Intangible assets |  |  |  |  |  |  |  | 24
Other non-current assets |  |  |  |  |  |  |  | 0
Total assets |  |  |  |  |  |  |  | 44
Deferred tax liabilities |  |  |  |  |  |  |  | (8)
Other liabilities |  |  |  |  |  |  |  | (13)
Total liabilities |  |  |  |  |  |  |  | (21)
Net assets acquired |  |  |  |  |  |  |  | 23
Consideration paid, net of cash acquired |  |  |  |  |  |  | £ 43 | 43
Non-controlling interests |  |  |  |  |  |  |  | 0
Fair value of previously held interests at acquisition date |  |  |  |  |  |  |  | 0
Goodwill recognised as of acquisition date |  |  |  |  |  |  |  | $ 20
ASL |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  | $ 11 |  |
Property, plant and equipment |  |  |  |  |  | 14 |  |
Intangible assets |  |  |  |  |  | 16 |  |
Other non-current assets |  |  |  |  |  | 1 |  |
Total assets |  |  |  |  |  | 42 |  |
Deferred tax liabilities |  |  |  |  |  | (6) |  |
Other liabilities |  |  |  |  |  | (10) |  |
Total liabilities |  |  |  |  |  | (16) |  |
Net assets acquired |  |  |  |  |  | 26 |  |
Consideration paid, net of cash acquired |  |  |  |  | £ 39 | 39 |  |
Non-controlling interests |  |  |  |  |  | 0 |  |
Fair value of previously held interests at acquisition date |  |  |  |  |  | 0 |  |
Goodwill recognised as of acquisition date |  |  |  |  |  | $ 13 |  |
CSM |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Current assets |  |  |  | $ 68 |  |  |  |
Property, plant and equipment |  |  |  | 16 |  |  |  |
Intangible assets |  |  |  | 0 |  |  |  |
Other non-current assets |  |  |  | 1 |  |  |  |
Total assets |  |  |  | 85 |  |  |  |
Deferred tax liabilities |  |  |  | 0 |  |  |  |
Other liabilities |  |  |  | (51) |  |  |  |
Total liabilities |  |  |  | (51) |  |  |  |
Net assets acquired |  |  |  | 34 |  |  |  |
Consideration paid, net of cash acquired | € 7 |  |  | 7 |  |  |  |
Non-controlling interests |  |  |  | 4 |  |  |  |
Fair value of previously held interests at acquisition date |  |  |  | $ 20 |  |  |  |
Gain recognised in bargain purchase transaction | € (3) | $ (3) |  |  |  |  |  |
ArcelorMittal Texas HBI |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Current assets |  |  | $ 269 |  |  |  |  |
Property, plant and equipment |  |  | 763 |  |  |  |  |
Intangible assets |  |  | 11 |  |  |  |  |
Other non-current assets |  |  | 0 |  |  |  |  |
Total assets |  |  | 1,043 |  |  |  |  |
Deferred tax liabilities |  |  | 0 |  |  |  |  |
Other liabilities |  |  | (75) |  |  |  |  |
Total liabilities |  |  | (75) |  |  |  |  |
Net assets acquired |  |  | 968 |  |  |  |  |
Consideration paid, net of cash acquired |  |  | 806 |  |  |  |  |
Non-controlling interests |  |  | 196 |  |  |  |  |
Fair value of previously held interests at acquisition date |  |  | 0 |  |  |  |  |
Goodwill recognised as of acquisition date |  |  | $ 34 |  |  |  |  |

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- Definition Expiry date 2022-01-01: The amount recognised as of the acquisition date for current assets acquired in a business combination. [Refer: Business combinations [member]] Effective 2022-01-01: The amount recognised as of the acquisition date for current assets acquired in a business combination. [Refer: Current assets; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for deferred tax liabilities assumed in a business combination. [Refer: Deferred tax liabilities; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount of non-controlling interest in the acquiree recognised at the acquisition date for business combinations in which the acquirer holds less than 100 per cent of the equity interests in the acquiree at the acquisition date. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph o -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_o_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for plant, property and equipment acquired in a business combination. [Refer: Property, plant and equipment; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph IE72 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_IE72&doctype=Illustrative%20Examples -URIDate 2021-03-24 + Details
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