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SEGMENT AND GEOGRAPHIC INFORMATION - Disaggregated revenue (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Disclosure of products and services [line items] |  |
Sales | $ 43,978 | $ 35,536
Others |  |
Disclosure of products and services [line items] |  |
Sales | 9 | 9
NAFTA | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 7,385 | 5,755
Brazil | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 6,291 | 4,861
Europe | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 26,377 | 19,990
ACIS | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 3,189 | 4,170
Mining | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 727 | 751
Steel sales |  |
Disclosure of products and services [line items] |  |
Sales | 39,517 | 31,526
Steel sales | Others |  |
Disclosure of products and services [line items] |  |
Sales | 0 | 0
Steel sales | NAFTA | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 7,153 | 5,594
Steel sales | Brazil | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 5,877 | 4,588
Steel sales | Europe | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 23,720 | 17,874
Steel sales | ACIS | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 2,767 | 3,470
Steel sales | Mining | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 0 | 0
Non-steel sales |  |
Disclosure of products and services [line items] |  |
Sales | 2,156 | 2,183
Non-steel sales | Others |  |
Disclosure of products and services [line items] |  |
Sales | 0 | 0
Non-steel sales | NAFTA | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 10 | 1
Non-steel sales | Brazil | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 87 | 91
Non-steel sales | Europe | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 1,124 | 861
Non-steel sales | ACIS | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 227 | 490
Non-steel sales | Mining | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 708 | 740
By-product sales |  |
Disclosure of products and services [line items] |  |
Sales | 856 | 601
By-product sales | Others |  |
Disclosure of products and services [line items] |  |
Sales | 0 | 0
By-product sales | NAFTA | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 64 | 43
By-product sales | Brazil | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 67 | 52
By-product sales | Europe | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 641 | 439
By-product sales | ACIS | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 84 | 67
By-product sales | Mining | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 0 | 0
Other sales |  |
Disclosure of products and services [line items] |  |
Sales | 1,449 | 1,226
Other sales | Others |  |
Disclosure of products and services [line items] |  |
Sales | 9 | 9
Other sales | NAFTA | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 158 | 117
Other sales | Brazil | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 260 | 130
Other sales | Europe | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 892 | 816
Other sales | ACIS | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | 111 | 143
Other sales | Mining | Operating segments |  |
Disclosure of products and services [line items] |  |
Sales | $ 19 | $ 11

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