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15. INCOME TAX AND SOCIAL CONTRIBUTION (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning R$ (1,110,440) R$ (976,746)      
Movement in shareholders' equity 21,208 26,778      
Movement in profit or loss 576,895 (50,128)      
Other movement   (110,344)      
Deferred tax asset/liability, ending (512,337) (1,110,440)      
Total deferred assets     R$ 89,394 R$ 63,119 R$ 70,151
Total deferred liabilities     (601,731) (1,173,559) (1,046,897)
Total deferred (512,337) (1,110,440) (512,337) (1,110,440) (976,746)
Deferred income tax losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 1,137,234 970,800      
Movement in profit or loss (177,378) 245,846      
Other movement (616) (79,412)      
Deferred tax asset/liability, ending 959,240 1,137,234      
Total deferred 1,137,234 1,137,234 959,240 1,137,234 970,800
Deferred social contribution tax losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 406,884 340,629      
Movement in profit or loss (39,303) 94,843      
Other movement (223) (28,588)      
Deferred tax asset/liability, ending 367,358 406,884      
Total deferred 406,884 406,884 367,358 406,884 340,629
Temporary differences          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (2,654,558) (2,288,175)      
Movement in shareholders' equity 21,208 26,778      
Movement in profit or loss 793,576 (390,817)      
Other movement 839 (2,344)      
Deferred tax asset/liability, ending (1,838,935) (2,654,558)      
Total deferred (2,654,558) (2,654,558) (1,838,935) (2,654,558) (2,288,175)
Provision for tax social security, labor, civil and environmental risks          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 269,899 256,936      
Movement in profit or loss (5,846) 12,963      
Other movement 3,184        
Deferred tax asset/liability, ending 267,237 269,899      
Total deferred 269,899 269,899 267,237 269,899 256,936
Provision for environmental liabilities          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 86,851 95,048      
Movement in profit or loss (19,708) (8,197)      
Deferred tax asset/liability, ending 67,143 86,851      
Total deferred 86,851 86,851 67,143 86,851 95,048
Assets impairment losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 88,433 93,908      
Movement in profit or loss (7,092) (5,475)      
Deferred tax asset/liability, ending 81,341 88,433      
Total deferred 88,433 88,433 81,341 88,433 93,908
Inventory impairment losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 45,814 35,703      
Movement in profit or loss (7,054) 10,111      
Deferred tax asset/liability, ending 38,760 45,814      
Total deferred 45,814 45,814 38,760 45,814 35,703
(Gains )/ losses in financial instruments          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (912) (2,300)      
Movement in profit or loss (2,407) 1,388      
Deferred tax asset/liability, ending (3,319) (912)      
Total deferred (912) (912) (3,319) (912) (2,300)
(Gains )/losses on available for sale financial assets          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 417,659 705,929      
Movement in shareholders' equity 530,292 316,563      
Movement in profit or loss (584,856)        
Deferred tax asset/liability, ending 363,095 417,659      
Total deferred 417,659 417,659 363,095 417,659 705,929
Actuarial liability (pension and healthcare plan)          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 273,058 134,578      
Movement in shareholders' equity (48) 180,834      
Movement in profit or loss 3,022 (41,065)      
Other movement   (1,289)      
Deferred tax asset/liability, ending 276,032 273,058      
Total deferred 273,058 273,058 276,032 273,058 134,578
Accrued supplies and services          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 67,716 123,101      
Movement in profit or loss 27,928 (55,385)      
Deferred tax asset/liability, ending 95,644 67,716      
Total deferred 67,716 67,716 95,644 67,716 123,101
Allowance for doubtful debts          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 47,216 42,008      
Movement in profit or loss 14,199 5,208      
Deferred tax asset/liability, ending 61,415 47,216      
Total deferred 47,216 47,216 61,415 47,216 42,008
Goodwil on merger          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 608 815      
Movement in profit or loss (608) (207)      
Deferred tax asset/liability, ending   608      
Total deferred 608 608   608 815
Unrealized exchange differences          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 1,511,152 1,589,651      
Movement in shareholders' equity   56,493      
Movement in profit or loss (500,620) (134,992)      
Deferred tax asset/liability, ending 1,010,532 1,511,152      
Total deferred 1,511,152 1,511,152 1,010,532 1,511,152 1,589,651
(Gain) in control loss on Transnordestina          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (92,180) (92,180)      
Deferred tax asset/liability, ending (92,180) (92,180)      
Total deferred (92,180) (92,180) (92,180) (92,180) (92,180)
Cash flow hedge accounting          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 134,479 148,471      
Movement in shareholders' equity 355,563 (13,992)      
Deferred tax asset/liability, ending 490,042 134,479      
Total deferred 134,479 134,479 490,042 134,479 148,471
Acquisition Fair Value SWT/CBL          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (193,311) (199,001)      
Movement in shareholders' equity (16,683) (21,143)      
Movement in profit or loss 37,880 26,833      
Deferred tax asset/liability, ending (172,114) (193,311)      
Total deferred (193,311) (193,311) (172,114) (193,311) (199,001)
Deferred taxes non computed          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (212,236) (1,324,437)      
Movement in shareholders' equity   (566,173)      
Movement in profit or loss (38,359) (3,255)      
Other movement (2,345) (115)      
Deferred tax asset/liability, ending (252,940) (212,236)      
Total deferred (212,236) (212,236) (252,940) (212,236) (1,324,437)
Estimated (Losses)/reversals to deferred taxes credits          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (4,130,928) (3,013,730)      
Movement in shareholders' equity (885,069) 82,769      
Movement in profit or loss 1,929,424 (123,056)      
Deferred tax asset/liability, ending (3,086,573) (4,130,928)      
Total deferred (4,130,928) (4,130,928) (3,086,573) (4,130,928) (3,013,730)
Business Combination          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (1,040,536) (1,072,824)      
Movement in profit or loss 9,724 32,288      
Deferred tax asset/liability, ending (1,030,812) (1,040,536)      
Total deferred (1,040,536) (1,040,536) (1,030,812) (1,040,536) (1,072,824)
Others          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 72,660 190,149      
Movement in shareholders' equity 37,153 (8,573)      
Movement in profit or loss (62,051) (107,976)      
Other movement   (940)      
Deferred tax asset/liability, ending 47,762 72,660      
Total deferred R$ 72,660 R$ 72,660 R$ 47,762 R$ 72,660 R$ 190,149