SCOPE OF CONSOLIDATION - Impairment of Associates and Joint Ventures (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairments of equity method investments | $ 123 | $ 0 | $ 1,405 |
| Tameh Holding | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairments of equity method investments | 81 | ||
| Acciaierie d'Italia Holding | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairments of equity method investments | 1,405 | ||
| ArcelorMittal Zenica | |||
| Disclosure of impairment loss and reversal of impairment loss [line items] | |||
| Impairments of equity method investments | $ 11 | ||