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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Summarized income statement information) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of unconsolidated structured entities [line items]      
Net sales $ 16,090,744 $ 8,735,435 $ 10,192,818
Cost of sales (9,895,070) (7,099,923) (8,452,440)
Gross profit 6,195,674 1,635,512 1,740,378
Selling, general and administrative expenses (950,124) (762,882) (897,475)
Other operating income, net 25,586 206,843 21,663
Operating income 5,271,136 1,079,473 864,566
Profit before income tax expense 5,764,330 1,159,359 826,564
Income tax expense (1,397,139) (291,488) (196,519)
Net profit (loss) before non-controlling interest 4,367,191 867,871 630,045
Non-controlling interest in other subsidiaries (542,123) (89,403) (65,776)
Net profit (loss) for the year 3,825,068 778,468 $ 564,269
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A.      
Disclosure of unconsolidated structured entities [line items]      
Net sales 6,270,000 3,133,000  
Cost of sales (4,168,000) (2,509,000)  
Gross profit 2,102,000 624,000  
Selling, general and administrative expenses (199,000) (161,000)  
Other operating income, net 197,000 61,000  
Operating income 2,100,000 524,000  
Financial expenses, net 158,000 (234,000)  
Equity in earnings of associated companies 41,000 30,000  
Profit before income tax expense 2,299,000 320,000  
Income tax expense (426,000) (97,000)  
Net profit (loss) before non-controlling interest 1,873,000 223,000  
Non-controlling interest in other subsidiaries (185,000) (117,000)  
Net profit (loss) for the year $ 1,688,000 $ 106,000