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SHORT-TERM AND LONG-TERM DEBT - Long-term debt narrative (Details) € in Millions, $ in Millions, R in Billions |  |  | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jan. 14, 2022 USD ($) | Jan. 14, 2022 EUR (€) | Dec. 19, 2018 USD ($) extension_option | Jun. 30, 2022 USD ($) ratingAgency | Jun. 30, 2021 USD ($) | Jun. 30, 2022 EUR (€) ratingAgency | Jun. 30, 2022 CAD ($) ratingAgency | Jun. 30, 2022 ZAR (R) ratingAgency | May 06, 2022 EUR (€) | May 04, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Nov. 29, 2021 USD ($) | Nov. 29, 2021 CAD ($) | Jun. 02, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Jul. 02, 2020 USD ($) | Jul. 02, 2020 CAD ($) | Jul. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 21, 2018 EUR (€) | Dec. 21, 2017 USD ($) | May 25, 2017 ZAR (R) | Dec. 16, 2016 EUR (€) | Apr. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Oct. 26, 2012 USD ($) | Sep. 30, 2010 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of credit rating agencies | ratingAgency |  |  |  | 2 |  | 2 | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities |  |  |  | $ 727,000,000 | $ 3,085,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange gains arising on translation |  |  |  | 363,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedges of net investment in foreign operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedging instrument, liabilities | € |  |  |  |  |  | € 4,512.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedged item, assets | € |  |  |  |  |  | 9,934.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.5 billion revolving credit facility, due 2023-2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 5,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,500,000,000 |  |  |
Borrowings, number of extension options | extension_option |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, extension option term |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  | 5,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | 5,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | 0 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
5.4 billion revolving credit facility, due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |
0.1 billion revolving credit facility, due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2010 Revolving multi-currency letter of credit facility, due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 | $ 450,000,000 | $ 500,000,000
Revolving multi-currency letter of credit facility, due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |
€600 million unsecured notes, due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities | $ 551,000,000 | € 486.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € |  | € 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
EIB Loan, 2021 to 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  | 291,000,000 |  | 280.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 280.0 |  |  |  |  |  |  |  |  |  |  |  |  |
€350 million EIB Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 350.0 |  |  |  |
Borrowings outstanding |  |  |  | 167,000,000 |  | 160.0 |  |  |  |  | $ 215,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
€346.5m variable rate loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity | € |  |  |  |  |  |  |  |  |  | € 346.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
€24.5m variable rate loan | Fixed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity | € |  |  |  |  |  |  |  |  |  | 24.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
€263m variable rate loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity | € |  |  |  |  |  |  |  |  |  | 263.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
€66m variable rate loan | Fixed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity | € |  |  |  |  |  |  |  |  |  | € 66.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
€25m fixed rate loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity | € |  |  |  |  |  |  |  |  | € 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  | 753,000,000 |  | 725.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
€235 million facility agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 235.0 |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 157,000,000 |  | € 152.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, installment period |  |  |  | 8 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CAD 174 million financing agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 128,000,000 | $ 174 |  |  |  |  |  |  |  |  |  |
CAD 130m financing agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Undrawn borrowing facilities |  |  |  | $ 73,000,000 |  |  | $ 95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 105,000,000 | $ 130 |  |  |  |  |  |  |  |  |  |  |  |  |  |
EBRD Facility | ArcelorMittal Kryvyi Rih |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maximum capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  |
Borrowings outstanding |  |  |  |  | $ 59,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  |  |  |
Borrowings, maximum capacity, additional |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |  |
4.5 billion ZAR revolving borrowing base finance facility, due 2022 | ArcelorMittal South Africa Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R 4.5 |  |  |  |  |
Borrowings outstanding |  |  |  | $ 74,000,000 |  |  |  | R 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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