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18. INCOME TAX AND SOCIAL CONTRIBUTION (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning R$ 1,883,765 R$ (512,337)      
Movement in profit or loss 170,604 215,306      
Deferred tax asset/liability, ending 3,256,110 1,883,765      
Total deferred assets     R$ 3,874,946 R$ 2,473,304 R$ 89,394
Total deferred liabilities     (618,836) (589,539) (601,731)
Total deferred 1,883,765 (512,337) 3,256,110 1,883,765 (512,337)
Deferred Income Tax Losses [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 1,610,801 959,240      
Movement in profit or loss 238,198 651,561      
Deferred tax asset/liability, ending 1,848,999 1,610,801      
Total deferred 1,848,999 959,240 1,848,999 1,610,801 959,240
Deferred social contribution tax losses [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 610,046 367,358      
Movement in profit or loss 78,162 242,688      
Deferred tax asset/liability, ending 688,208 610,046      
Total deferred 688,208 367,358 688,208 610,046 367,358
Temporary Differences [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning (337,082) (1,838,935)      
Movement in shareholders' equity (59,380) (2,357)      
Movement in profit or loss 1,110,336 1,504,151      
Other movement 5,029 59      
Deferred tax asset/liability, ending 718,903 (337,082)      
Total deferred 718,903 (1,838,935) 718,903 (337,082) (1,838,935)
Provision For Tax Social Security, Labor, Civil And Environmental Risks [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 264,013 334,380      
Movement in profit or loss 15,136 (70,367)      
Deferred tax asset/liability, ending 279,149 264,013      
Total deferred 279,149 334,380 279,149 264,013 334,380
Assets impairment losses [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 182,431 181,516      
Movement in profit or loss (26,444) 915      
Other movement 5,029        
Deferred tax asset/liability, ending 161,016 182,431      
Total deferred 161,016 181,516 161,016 182,431 181,516
(Gains )/ losses On financial instruments [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 414,495 359,776      
Movement in profit or loss (409,468) 54,719      
Deferred tax asset/liability, ending 5,027 414,495      
Total deferred 5,027 414,495 5,027 414,495 359,776
Actuarial liability (pension and healthcare plan) [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 314,601 276,032      
Movement in shareholders' equity (44,732) 38,569      
Movement in profit or loss (7,412)        
Deferred tax asset/liability, ending 262,457 314,601      
Total deferred 262,457 276,032 262,457 314,601 276,032
Accrued supplies and services [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 132,411 95,644      
Movement in profit or loss 22,041 36,767      
Deferred tax asset/liability, ending 154,452 132,411      
Total deferred 154,452 95,644 154,452 132,411 95,644
Unrealized exchange differences [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning [1] 1,181,501 1,010,532      
Movement in profit or loss [1] (29,172) 170,969      
Deferred tax asset/liability, ending [1] 1,152,326 1,181,501      
Total deferred [1] 1,152,326 1,010,532 1,152,326 1,181,501 1,010,532
Gain upon loss of control in Transnordestina [member]          
IncomeTaxAndSocialContributionLineItems [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]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 426,961 490,041      
Movement in shareholders' equity 1,315,839 (63,080)      
Deferred tax asset/liability, ending 1,742,800 426,961      
Total deferred 1,742,800 490,041 1,742,800 426,961 490,041
Aquisition Fair Value SWT/CBL [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning (184,513) (172,114)      
Movement in shareholders' equity (57,651) (52,071)      
Movement in profit or loss 30,149 39,672      
Deferred tax asset/liability, ending (212,015) (184,513)      
Total deferred (212,015) (172,114) (212,015) (184,513) (172,114)
Deferred taxes non computed [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning (291,961) (252,940)      
Movement in profit or loss (25,966) (39,021)      
Deferred tax asset/liability, ending (317,927) (291,961)      
Total deferred (317,927) (252,940) (317,927) (291,961) (252,940)
Estimated (Losses)/reversals to deferred taxes credits [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning (1,625,998) (3,086,572)      
Movement in shareholders' equity (1,270,110) 25,159      
Movement in profit or loss 1,548,640 1,435,415      
Deferred tax asset/liability, ending (1,347,468) (1,625,998)      
Total deferred (1,347,468) (3,086,572) (1,347,468) (1,625,998) (3,086,572)
Business Combination [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning (1,023,341) (1,030,812)      
Movement in profit or loss 8,292 7,471      
Deferred tax asset/liability, ending (1,015,049) (1,023,341)      
Total deferred (1,015,049) (1,030,812) (1,015,049) (1,023,341) (1,030,812)
Consolidation CBSI [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning 50        
Movement in profit or loss   (12)      
Other movement   62      
Deferred tax asset/liability, ending 50 50      
Total deferred 50 50 50 50  
Others [member]          
IncomeTaxAndSocialContributionLineItems [Line Items]          
Deferred tax asset/liability, beginning (35,552) 47,762      
Movement in shareholders' equity (2,726) 49,066      
Movement in profit or loss (15,457) (132,377)      
Other movement   (3)      
Deferred tax asset/liability, ending (53,735) (35,552)      
Total deferred R$ (53,735) R$ 47,762 R$ (53,735) R$ (35,552) R$ 47,762
[1] The Company taxes exchange differences on a cash basis to calculate income tax and social contribution on net income.