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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