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14 INCOME TAX AND SOCIAL CONTRIBUTION (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning R$ (512,337) R$ (1,110,440)      
Movement in profit or loss 215,306 176,700      
Deferred tax asset/liability, ending 1,883,765 (512,337)      
Total deferred assets     R$ 2,473,304 R$ 89,394 R$ 63,119
Total deferred liabilities     (589,539) (601,731) (1,173,559)
Total deferred (512,337) (1,110,440) 1,883,765 (512,337) (1,110,440)
Deferred Income Tax Losses [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 959,240 1,137,234      
Movement in profit or loss 651,561 (177,378)      
Other movement   (616)      
Deferred tax asset/liability, ending 1,610,801 959,240      
Total deferred 1,610,801 959,240 1,610,801 959,240 1,137,234
Deferred social contribution tax losses [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 367,358 406,884      
Movement in profit or loss 242,688 (39,303)      
Other movement   (223)      
Deferred tax asset/liability, ending 610,046 367,358      
Total deferred 610,046 367,358 610,046 367,358 406,884
Temporary Differences [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning (1,838,935) (2,654,558)      
Movement in shareholders' equity (2,357) 21,208      
Movement in profit or loss 1,504,151 793,576      
Other movement 59 839      
Deferred tax asset/liability, ending (337,082) (1,838,935)      
Total deferred (337,082) (1,838,935) (337,082) (1,838,935) (2,654,558)
Provision For Tax Social Security, Labor, Civil And Environmental Risks [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 334,380 356,750      
Movement in profit or loss (70,367) (25,554)      
Other movement   3,184      
Deferred tax asset/liability, ending 264,013 334,380      
Total deferred 264,013 334,380 264,013 334,380 356,750
Assets impairment losses [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 181,516 181,463      
Movement in profit or loss 915 53      
Deferred tax asset/liability, ending 182,431 181,516      
Total deferred 182,431 181,516 182,431 181,516 181,463
(Gains )/ losses in financial instruments [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 359,776 416,747      
Movement in shareholders' equity   530,292      
Movement in profit or loss   (587,263)      
Deferred tax asset/liability, ending 414,495 359,776      
Total deferred 414,495 359,776 414,495 359,776 416,747
(Gains )/ losses On financial instruments [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Movement in profit or loss 54,719        
Actuarial liability (pension and healthcare plan) [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 276,032 273,058      
Movement in shareholders' equity 38,569 (48)      
Movement in profit or loss   3,022      
Deferred tax asset/liability, ending 314,601 276,032      
Total deferred 314,601 276,032 314,601 276,032 273,058
Accrued supplies and services [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 95,644 67,716      
Movement in profit or loss 36,767 27,928      
Deferred tax asset/liability, ending 132,411 95,644      
Total deferred 132,411 95,644 132,411 95,644 67,716
Goodwil on merger [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 608      
Movement in profit or loss   (608)      
Deferred tax asset/liability, ending      
Total deferred 608
Unrealized exchange differences [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning [1] 1,010,532 1,511,152      
Movement in profit or loss [1] 170,969 (500,620)      
Deferred tax asset/liability, ending [1] 1,181,501 1,010,532      
Total deferred [1] 1,181,501 1,010,532 1,181,501 1,010,532 1,511,152
(Gain) in control loss on Transnordestina [Member]          
IncomeTaxAndSocialContributionTillLineItems [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 [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 490,042 134,479      
Movement in shareholders' equity (63,080) 355,563      
Deferred tax asset/liability, ending 426,961 490,042      
Total deferred 426,961 490,042 426,961 490,042 134,479
Aquisition Fair Value SWT/CBL [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning (172,114) (193,311)      
Movement in shareholders' equity (52,071) (16,683)      
Movement in profit or loss 39,672 37,880      
Deferred tax asset/liability, ending (184,513) (172,114)      
Total deferred (184,513) (172,114) (184,513) (172,114) (193,311)
Deferred taxes non computed [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning (252,940) (212,236)      
Movement in profit or loss (39,021) (38,359)      
Other movement   (2,345)      
Deferred tax asset/liability, ending (291,961) (252,940)      
Total deferred (291,961) (252,940) (291,961) (252,940) (212,236)
Estimated (Losses)/reversals to deferred taxes credits [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning (3,086,573) (4,130,928)      
Movement in shareholders' equity 25,159 (885,069)      
Movement in profit or loss 1,435,415 1,929,424      
Deferred tax asset/liability, ending (1,625,998) (3,086,573)      
Total deferred (1,625,998) (3,086,573) (1,625,998) (3,086,573) (4,130,928)
Business Combination [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning (1,030,812) (1,040,536)      
Movement in profit or loss 7,471 9,724      
Deferred tax asset/liability, ending (1,023,341) (1,030,812)      
Total deferred (1,023,341) (1,030,812) (1,023,341) (1,030,812) (1,040,536)
Consolidation CBSI [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning      
Movement in profit or loss (12)        
Other movement 62        
Deferred tax asset/liability, ending 50      
Total deferred 50 50
Others [Member]          
IncomeTaxAndSocialContributionTillLineItems [Line Items]          
Deferred tax asset/liability, beginning 47,762 72,660      
Movement in shareholders' equity 49,066 37,153      
Movement in profit or loss (132,377) (62,051)      
Other movement (3)        
Deferred tax asset/liability, ending (35,552) 47,762      
Total deferred R$ (35,552) R$ 47,762 R$ (35,552) R$ 47,762 R$ 72,660
[1] The Company taxes exchange differences on a cash basis to calculate income tax and social contribution on net income.