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COMMITMENTS - Narrative (Details) t in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 16, 2020 USD ($) | Jun. 30, 2022 USD ($) t | Dec. 31, 2021 USD ($)
Disclosure of commitments [line items] |  |  |
Commitments in relation to associates |  | $ 1,488,000,000 | $ 1,562,000,000
Commitments in relation to joint ventures |  | 886,000,000 | 1,140,000,000
Provision of guarantees or collateral by entity, third party transactions |  | 175,000,000 | 146,000,000
Pledges of property, plant and equipment |  | 108,000,000 | 111,000,000
Other commitments |  | 1,549,000,000 | 1,576,000,000
Supply commitment, remaining minimum amount committed |  | 379,000,000 | 292,000,000
ArcelorMittal South Africa Ltd. (AMSA) |  |  |
Disclosure of commitments [line items] |  |  |
Contractual capital commitments |  |  | 100,000,000
ArcelorMittal México S.A. de C.V. |  |  |
Disclosure of commitments [line items] |  |  |
Contractual capital commitments |  | $ 115,000,000 | 158,000,000
Total amount of investment program |  |  | 1,000,000,000
Construction capacity of investment program (in tonnes) | t |  | 2.5 |
ArcelorMittal Brasil S.A. |  |  |
Disclosure of commitments [line items] |  |  |
Expected costs to be in compliance with the ECA |  | $ 176,000,000 |
Maximum fine for non-compliance with agreement |  | 19,000,000 | 18,000,000
Other commitments |  | $ 452,000,000 | 442,000,000
5.146 billion 10-year term loan |  |  |
Disclosure of commitments [line items] |  |  |
Percent guaranteed |  | 60.00% |
Notional amount | $ 5,146,000,000 |  |
Borrowings, term | 10 years |  |
Asset-based revolving credit facility | South Africa | Operating subsidiaries |  |  |
Disclosure of commitments [line items] |  |  |
Debt instrument, collateral amount |  | $ 74,000,000 |
Debt instrument, ceded bank accounts to secure environmental obligations, true sale of receivables programs and revolving base finance facility |  | 58,000,000 |
Associates |  |  |
Disclosure of commitments [line items] |  |  |
Provision of guarantees or collateral by entity, related party transactions |  | 12,000,000 | 12,000,000
Commitments within sureties, guarantees, LOC, pledges, and other collateral |  | 411,000,000 | 406,000,000
Joint ventures |  |  |
Disclosure of commitments [line items] |  |  |
Provision of guarantees or collateral to entity, related party transactions |  | 4,353,000,000 | 4,295,000,000
Commitments within sureties, guarantees, LOC, pledges, and other collateral |  | 527,000,000 | 452,000,000
Tameh |  |  |
Disclosure of commitments [line items] |  |  |
Commitments in relation to joint ventures |  | 424,000,000 | 611,000,000
Enerfos |  |  |
Disclosure of commitments [line items] |  |  |
Commitments in relation to joint ventures |  | 452,000,000 | 515,000,000
Calvert | Joint ventures |  |  |
Disclosure of commitments [line items] |  |  |
Provision of guarantees or collateral to entity, related party transactions |  | 312,000,000 | 279,000,000
Al Jubail | Joint ventures |  |  |
Disclosure of commitments [line items] |  |  |
Provision of guarantees or collateral to entity, related party transactions |  | 177,000,000 | 175,000,000
Global Chartering Limited |  |  |
Disclosure of commitments [line items] |  |  |
Counter guarantees |  | 318,000,000 | 323,000,000
ArcelorMittal Nippon Steel India Limited | Joint ventures |  |  |
Disclosure of commitments [line items] |  |  |
Provision of guarantees or collateral to entity, related party transactions |  | 3,088,000,000 | 3,088,000,000
Kryvyi Rih Industrial Gas |  |  |
Disclosure of commitments [line items] |  |  |
Commitments in relation to associates |  | $ 653,000,000 | $ 819,000,000

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