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24. OTHER OPERATING INCOME (EXPENSES) (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income R$ 4,036,043 R$ 824,286 R$ 663,509  
Other operating expenses (1,330,706) (646,944) (1,076,730)  
Other operating income (expenses), net 2,705,337 177,342 (413,221)  
Taxes and fees        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (26,197) (136,348) (88,249)  
Write-off / (Provision) of judicial deposits        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (54,330) (38,258) (64,886)  
Expenses with environmental liabilities, net        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (60,311) (7,156) (5,023)  
Expenses from tax, social security, labor, civil and environmental law suits        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (59,219) (95,744)    
Contractual fines        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (104,086)      
Depreciation of unused equipment and amortization of intangible assets        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (97,914) (44,570) (43,681)  
Write off of PP&E and Intangible assets        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (27,260) (28,127) (88,339)  
Losses /reversals estimated in inventories        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (149,704) (12,903) (29,316)  
Losses on spare parts        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses   (2,872)    
Studies and project engineering expenses        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (33,738) (32,956) (31,156)  
Research and development expenses        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (2,688) (3,944)   R$ (2,269)
Advisory expenses        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (508) (3,419) (20,865)  
Healthcare plan expenses        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (108,369) (97,837) (80,489)  
Provisions/(Provision) for industrial restructuring        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (17,490) 5,807 96,390  
Hedge cash flow realized        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (370,191) (92,140) (77,444)  
Impairment of fair value of Transnordestina        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses     (387,989)  
Other expenses        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating expenses (218,701) (56,477) (85,256)  
Indemnities/gains on lawsuits        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 46,256 6,106 26,871  
Rentals and leases        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 5,430 1,841 1,483  
Dividends received        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 9,188 3,248 567  
Extemporaneous PIS/COFINS credits        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 1,102,365   203,504  
Contractual fines        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 3,965 2,970 2,501  
Gain on business combination        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income     66,496  
Actuarial pension plan        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 20,983 36,952 48,790  
Updated shares - VJR        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 1,655,813      
Gain on sale of LLC        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income 1,164,294      
Other revenues        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income R$ 27,749 18,018 61,274  
Gain on sales of assets held for sale        
Disclosure of disaggregation of revenue from contracts with customers [line items]        
Other operating income   R$ 755,151 R$ 252,023