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ACQUISITIONS -Narrative (Details) € in Millions, £ in Millions, t in Millions, $ in Millions |  |  |  | 2 Months Ended | 4 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 01, 2022 EUR (€) subsidiary | Jun. 30, 2022 USD ($) t | May 09, 2022 USD ($) | May 09, 2022 EUR (€) | Jun. 30, 2022 USD ($) t | Jun. 30, 2022 USD ($) t | Dec. 31, 2023 t | Jun. 30, 2022 USD ($) t | Jul. 28, 2022 USD ($) km t | May 09, 2022 EUR (€) | May 02, 2022 GBP (£) | May 02, 2022 USD ($) | Feb. 28, 2022 GBP (£) | Feb. 28, 2022 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase agreement term |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  |  | $ 8,099.0 |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  |  | 44,585.0 |  |  |  |  |  |
CSM |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 91.68% | 91.68% |  |  |  |  |  |  |  |  |  |
CSM |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 49.29% | 49.29% |  |  |  |  |  |  |  |  |  |
JLM |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 35 |
Consideration paid, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  | 43 | $ 43.0
Cash and cash equivalents recognised as of acquisition date | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 5 |
Revenue of acquiree since acquisition date |  |  |  |  |  | $ 25.0 |  |  |  |  |  |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  |  | 1.0 |  |  |  |  |  |  |  |
ASL |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | £ |  |  |  |  |  |  |  |  |  |  | £ 36 |  |  |
Consideration paid, net of cash acquired |  |  |  |  |  |  |  |  |  |  | 39 | $ 39.0 |  |
Cash and cash equivalents recognised as of acquisition date | £ |  |  |  |  |  |  |  |  |  |  | £ 6 |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | $ 4.0 |  |  |  |  |  |  |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  | 1.0 |  |  |  |  |  |  |  |  |
CSM |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | € |  |  |  |  |  |  |  |  |  | € 13.5 |  |  |  |
Consideration paid, net of cash acquired |  |  | $ 7.0 |  |  |  |  |  |  | 7.0 |  |  |  |
Cash and cash equivalents recognised as of acquisition date | € |  |  |  |  |  |  |  |  |  | € 7.0 |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | 28.6 |  |  |  |  |  |  |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  | 6.3 |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 42.39% |  |  |  |  |  |  | 42.39% |  |  |  |
Gain recognised in bargain purchase transaction |  |  | $ 3.0 | € 3.0 |  |  |  |  |  |  |  |  |  |
ArcelorMittal Texas HBI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  | $ 818.0 |  |  | 818.0 | 818.0 |  | 818.0 |  |  |  |  |  |
Consideration paid, net of cash acquired |  | 806.0 |  |  | 806.0 | 806.0 |  | 806.0 |  |  |  |  |  |
Cash and cash equivalents recognised as of acquisition date |  | $ 12.0 |  |  | $ 12.0 | $ 12.0 |  | $ 12.0 |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 80.00% |  |  | 80.00% | 80.00% |  | 80.00% |  |  |  |  |  |
Acquisition-related costs |  | $ 7.0 |  |  |  |  |  |  |  |  |  |  |  |
Annual capacity of HBI | t |  | 2.0 |  |  | 2.0 | 2.0 |  | 2.0 |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |
Consideration payable |  | $ 177.0 |  |  | $ 177.0 | $ 177.0 |  | $ 177.0 |  |  |  |  |  |
ArcelorMittal Texas HBI | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in developments after acquisition |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
EAF weight (in tonnes) | t |  |  |  |  |  |  | 1.5 |  |  |  |  |  |  |
ALBA International Recycling | Business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value | € | € 90.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries acquired | subsidiary | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
CSP | Business combination |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  |  |  |  |  |  |  | $ 2,200.0 |  |  |  |  |
Blast furnace capacity | t |  |  |  |  |  |  |  |  | 3.0 |  |  |  |  |
Distance to port of Pecém (kilometres) | km |  |  |  |  |  |  |  |  | 10 |  |  |  |  |

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