v3.25.4
SEGMENT REPORTING - Disaggregated Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 61,352 $ 62,441 $ 68,275
Steel sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 52,950 54,933 60,026
Non-steel sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 3,888 3,477 3,850
By-product sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 1,413 1,470 1,741
Other sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 3,101 2,561 2,658
Operating segments | North America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 12,277 11,793 12,856
Operating segments | Brazil      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 9,543 10,522 11,185
Operating segments | Europe      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 25,552 26,547 28,026
Operating segments | Sustainable Solutions      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 9,285 9,088 9,893
Operating segments | Mining      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 1,365 982 1,171
Operating segments | Steel sales | North America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 10,956 10,961 11,830
Operating segments | Steel sales | Brazil      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 8,691 9,769 10,393
Operating segments | Steel sales | Europe      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 22,569 23,210 24,345
Operating segments | Steel sales | Sustainable Solutions      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 8,382 8,335 9,224
Operating segments | Steel sales | Mining      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 0 0 0
Operating segments | Non-steel sales | North America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 498 401 541
Operating segments | Non-steel sales | Brazil      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 145 127 160
Operating segments | Non-steel sales | Europe      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 748 1,021 1,130
Operating segments | Non-steel sales | Sustainable Solutions      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 548 514 455
Operating segments | Non-steel sales | Mining      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 1,316 945 1,140
Operating segments | By-product sales | North America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 144 79 94
Operating segments | By-product sales | Brazil      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 178 166 174
Operating segments | By-product sales | Europe      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 893 1,033 1,259
Operating segments | By-product sales | Sustainable Solutions      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 41 47 46
Operating segments | By-product sales | Mining      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 0 0 0
Operating segments | Other sales | North America      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 679 352 391
Operating segments | Other sales | Brazil      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 529 460 458
Operating segments | Other sales | Europe      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 1,342 1,283 1,292
Operating segments | Other sales | Sustainable Solutions      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 314 192 168
Operating segments | Other sales | Mining      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 49 37 31
Others      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 3,330 3,509 5,144
Others | Steel sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 2,352 2,658 4,234
Others | Non-steel sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 633 469 424
Others | By-product sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 157 145 168
Others | Other sales      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 188 $ 237 $ 318