v3.25.2
SEGMENT AND GEOGRAPHIC INFORMATION - Disaggregated revenue (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of products and services [line items]    
Sales $ 30,724 $ 32,531
Others    
Disclosure of products and services [line items]    
Sales 1,613 1,775
North America | Operating segments    
Disclosure of products and services [line items]    
Sales 5,964 6,443
Brazil | Operating segments    
Disclosure of products and services [line items]    
Sales 4,748 5,212
Europe | Operating segments    
Disclosure of products and services [line items]    
Sales 13,163 13,843
Sustainable solutions | Operating segments    
Disclosure of products and services [line items]    
Sales 4,648 4,762
Mining | Operating segments    
Disclosure of products and services [line items]    
Sales 588 496
Steel sales    
Disclosure of products and services [line items]    
Sales 26,753 28,739
Steel sales | Others    
Disclosure of products and services [line items]    
Sales 1,168 1,358
Steel sales | North America | Operating segments    
Disclosure of products and services [line items]    
Sales 5,421 6,025
Steel sales | Brazil | Operating segments    
Disclosure of products and services [line items]    
Sales 4,356 4,826
Steel sales | Europe | Operating segments    
Disclosure of products and services [line items]    
Sales 11,587 12,173
Steel sales | Sustainable solutions | Operating segments    
Disclosure of products and services [line items]    
Sales 4,221 4,357
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 1,853 1,742
Non-steel sales | Others    
Disclosure of products and services [line items]    
Sales 289 215
Non-steel sales | North America | Operating segments    
Disclosure of products and services [line items]    
Sales 283 177
Non-steel sales | Brazil | Operating segments    
Disclosure of products and services [line items]    
Sales 60 78
Non-steel sales | Europe | Operating segments    
Disclosure of products and services [line items]    
Sales 417 501
Non-steel sales | Sustainable solutions | Operating segments    
Disclosure of products and services [line items]    
Sales 230 292
Non-steel sales | Mining | Operating segments    
Disclosure of products and services [line items]    
Sales 574 479
By-product sales    
Disclosure of products and services [line items]    
Sales 729 726
By-product sales | Others    
Disclosure of products and services [line items]    
Sales 68 76
By-product sales | North America | Operating segments    
Disclosure of products and services [line items]    
Sales 52 42
By-product sales | Brazil | Operating segments    
Disclosure of products and services [line items]    
Sales 86 83
By-product sales | Europe | Operating segments    
Disclosure of products and services [line items]    
Sales 460 501
By-product sales | Sustainable solutions | Operating segments    
Disclosure of products and services [line items]    
Sales 63 24
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 1,389 1,324
Other sales | Others    
Disclosure of products and services [line items]    
Sales 88 126
Other sales | North America | Operating segments    
Disclosure of products and services [line items]    
Sales 208 199
Other sales | Brazil | Operating segments    
Disclosure of products and services [line items]    
Sales 246 225
Other sales | Europe | Operating segments    
Disclosure of products and services [line items]    
Sales 699 668
Other sales | Sustainable solutions | Operating segments    
Disclosure of products and services [line items]    
Sales 134 89
Other sales | Mining | Operating segments    
Disclosure of products and services [line items]    
Sales $ 14 $ 17