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25 SEGMENT INFORMATION (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Net revenues R$ 25,436,417 R$ 22,968,885 R$ 18,524,601
Cost of sales and/or services 17,263,264 16,105,657 13,596,141
Gross profit 8,173,153 6,863,228 4,928,460
General and administrative expenses (2,853,870) (2,757,711) (2,230,948)
Depreciation 1,421,704 1,175,107 1,408,765
Proportionate EBITDA of joint ventures 510,072 568,045 538,170
Adjusted EBITDA 7,251,059 5,848,669 4,644,447
Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 10,950,701 11,353,437 8,706,466
Foreign Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 14,485,716 11,615,448 9,818,135
Asia [Member]      
Disclosure of operating segments [line items]      
Net revenues 8,209,796 5,760,314 4,501,551
North America [Member]      
Disclosure of operating segments [line items]      
Net revenues 767,977 1,506,041 2,009,337
Latin America [Member]      
Disclosure of operating segments [line items]      
Net revenues 169,036 369,830 506,951
Europe [Member]      
Disclosure of operating segments [line items]      
Net revenues 5,336,861 3,921,035 2,762,524
Others [Member]      
Disclosure of operating segments [line items]      
Net revenues 2,046 58,228 37,772
Steel[Member]      
Disclosure of operating segments [line items]      
Metric tons (Thou.) [1] 4,524,805 5,068,758 4,921,719
Net revenues 13,949,032 15,634,143 12,959,023
Cost of sales and/or services 12,962,861 12,613,216 10,537,547
Gross profit 986,171 3,020,927 2,421,476
General and administrative expenses (834,977) (984,980) (963,822)
Depreciation 700,074 609,274 658,587
Adjusted EBITDA 851,268 2,645,221 2,116,241
Steel[Member] | Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 10,027,999 10,328,372 7,818,552
Steel[Member] | Foreign Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 3,921,033 5,305,771 5,140,471
Steel[Member] | Asia [Member]      
Disclosure of operating segments [line items]      
Net revenues 2,980 40,681 23,364
Steel[Member] | North America [Member]      
Disclosure of operating segments [line items]      
Net revenues 767,977 1,506,041 2,009,337
Steel[Member] | Latin America [Member]      
Disclosure of operating segments [line items]      
Net revenues 169,036 369,830 506,951
Steel[Member] | Europe [Member]      
Disclosure of operating segments [line items]      
Net revenues 2,978,994 3,330,991 2,564,823
Steel[Member] | Others [Member]      
Disclosure of operating segments [line items]      
Net revenues 2,046 58,228 35,996
Mining [Member]      
Disclosure of operating segments [line items]      
Metric tons (Thou.) [1] 38,545,067 34,780,756 32,576,843
Net revenues 10,027,649 5,984,781 4,620,971
Cost of sales and/or services 4,396,247 3,585,691 3,005,840
Gross profit 5,631,402 2,399,090 1,615,131
General and administrative expenses (186,189) (144,754) (158,958)
Depreciation 476,374 366,547 490,805
Adjusted EBITDA 5,921,587 2,620,883 1,946,978
Mining [Member] | Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 926,836 972,360 829,268
Mining [Member] | Foreign Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 9,100,813 5,012,421 3,791,703
Mining [Member] | Asia [Member]      
Disclosure of operating segments [line items]      
Net revenues 6,742,946 4,422,377 3,592,226
Mining [Member] | Europe [Member]      
Disclosure of operating segments [line items]      
Net revenues 2,357,867 590,044 197,701
Mining [Member] | Others [Member]      
Disclosure of operating segments [line items]      
Net revenues     1,776
Logistics [Member] | Port [Member]      
Disclosure of operating segments [line items]      
Net revenues 240,451 266,378 238,240
Cost of sales and/or services 173,344 189,999 156,997
Gross profit 67,107 76,379 81,243
General and administrative expenses (34,560) (35,423) (27,943)
Depreciation 30,568 20,368 15,752
Adjusted EBITDA 63,115 61,324 69,052
Logistics [Member] | Port [Member] | Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 240,451 266,378 238,240
Logistics [Member] | Railroads [Member]      
Disclosure of operating segments [line items]      
Net revenues 1,321,355 1,506,114 1,416,612
Cost of sales and/or services 1,030,210 1,049,071 1,024,696
Gross profit 291,145 457,043 391,916
General and administrative expenses (109,770) (106,412) (94,921)
Depreciation 387,565 258,985 294,571
Adjusted EBITDA 568,940 609,616 591,566
Logistics [Member] | Railroads [Member] | Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 1,321,355 1,506,114 1,416,612
Energy [Member]      
Disclosure of operating segments [line items]      
Net revenues 325,343 410,606 407,671
Cost of sales and/or services 266,754 286,734 285,085
Gross profit 58,589 123,872 122,586
General and administrative expenses (29,034) (27,948) (27,098)
Depreciation 17,471 17,285 17,265
Adjusted EBITDA 47,026 113,209 112,753
Energy [Member] | Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 325,343 410,606 407,671
Cement [Member]      
Disclosure of operating segments [line items]      
Net revenues 570,805 588,230 487,129
Cost of sales and/or services 607,719 544,266 512,762
Gross profit (36,914) 43,964 (25,633)
General and administrative expenses (91,466) (95,893) (80,823)
Depreciation 139,667 115,411 121,801
Adjusted EBITDA 11,287 63,482 15,345
Cement [Member] | Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 570,805 588,230 487,129
Corporate expenses/elimination [Member]      
Disclosure of operating segments [line items]      
Metric tons (Thou.) [1] (3,258,923) (4,961,345) (5,359,571)
Net revenues (998,218) (1,421,367) (1,605,045)
Cost of sales and/or services (2,173,871) (2,163,320) (1,926,786)
Gross profit 1,175,653 741,953 321,741
General and administrative expenses (1,567,874) (1,362,301) (877,383)
Depreciation (330,015) (212,763) (190,016)
Proportionate EBITDA of joint ventures 510,072 568,045 538,170
Adjusted EBITDA (212,164) (265,066) (207,488)
Corporate expenses/elimination [Member] | Domestic Market [Member]      
Disclosure of operating segments [line items]      
Net revenues (2,462,088) (2,718,623) (2,491,006)
Corporate expenses/elimination [Member] | Foreign Market [Member]      
Disclosure of operating segments [line items]      
Net revenues 1,463,870 1,297,256 885,961
Corporate expenses/elimination [Member] | Asia [Member]      
Disclosure of operating segments [line items]      
Net revenues R$ 1,463,870 R$ 1,297,256 R$ 885,961
[1] The ore sales volumes presented in this note take into consideration Company sales and the interest in its subsidiaries and joint ventures.