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SEGMENT INFORMATION (Segment reporting information, by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [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
Financial income (expense), net 56,547 19,554 (39,756)
Equity in earnings (losses) of non-consolidated companies 400,732 57,555 60,967
Profit before income tax expense 5,764,330 1,159,359 826,564
Inter-segment eliminations      
Disclosure of operating segments [line items]      
Net sales (478,559) (334,619) (357,411)
Cost of sales 497,834 341,617 359,588
Gross profit 19,275 6,998 2,177
Selling, general and administrative expenses 0 0 0
Other operating income, net 0 0 0
Operating income 19,275 6,998 2,177
Steel | Operating segments      
Disclosure of operating segments [line items]      
Net sales 16,043,033 8,679,513 10,186,171
Cost of sales (10,082,270) (7,172,635) (8,552,493)
Gross profit 5,960,763 1,506,878 1,633,679
Selling, general and administrative expenses (923,660) (740,056) (885,146)
Other operating income, net 24,515 208,965 21,931
Operating income 5,061,618 975,787 770,466
Mining | Operating segments      
Disclosure of operating segments [line items]      
Net sales 526,270 390,541 364,058
Cost of sales (310,634) (268,905) (259,535)
Gross profit 215,636 121,636 104,523
Selling, general and administrative expenses (26,464) (22,826) (12,330)
Other operating income, net 1,071 (2,122) (268)
Operating income 190,243 96,688 91,924
Ternium      
Disclosure of operating segments [line items]      
Net sales 16,090,744 8,735,435 10,237,297
Operating income 4,415,791 1,149,249 989,982
Financial income (expense), net 92,462 22,331 (98,969)
Equity in earnings (losses) of non-consolidated companies 400,732 57,555 60,967
Profit before income tax expense 5,764,330 1,159,359 826,564
Depreciation and amortisation expense (591,790) (631,051) (661,112)
Ternium | Inter-segment eliminations      
Disclosure of operating segments [line items]      
Net sales (488,877) (328,333) (410,972)
Operating income 1,586 689 2,177
Depreciation and amortisation expense 0 0 0
Ternium | Reconciling items      
Disclosure of operating segments [line items]      
Cost of sales (855,345) 69,776 (99,315)
Effect of inflation adjustment (Note 3 (cc))   (224,731)
Ternium | Steel | Operating segments      
Disclosure of operating segments [line items]      
Net sales 16,043,033 8,679,513 10,230,650
Operating income 4,210,135 1,046,623 841,169
Depreciation and amortisation expense (528,144) (580,807) (612,744)
Ternium | Mining | Operating segments      
Disclosure of operating segments [line items]      
Net sales 536,588 384,255 417,619
Operating income 204,070 101,937 146,636
Depreciation and amortisation expense $ (63,646) $ (50,244) $ (48,368)