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10. INCOME AND SOCIAL CONTRIBUTION TAXES (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Jan. 02, 2019
 [1]
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
DisclosureOfIncomeAndSocialContributionTaxesLineItems [Line Items]        
Profit before income tax and social contribution tax   R$ 3,800    
Income tax and social contribution tax - nominal expense (34%)   (1,292)    
Tax effects applicable to:        
Gain (loss) in subsidiaries by equity method   93    
Interest on Equity   188    
Non-deductible contributions and donations   (10)    
Tax incentives   39    
Effects from subsidiaries taxed based on gross revenues   97    
Non-deductible penalties   (25)    
Impairment of accounts receivable from related parties   (13)    
Others   (13)    
Income tax and social contribution tax - effective expense   (936) R$ (1,599) R$ (610)
Current tax   (684)    
Deferred tax   (252)    
Income tax and social contribution tax - effective expense   R$ 936 1,599 610
Effective rate   24.63%    
Restated [member]        
DisclosureOfIncomeAndSocialContributionTaxesLineItems [Line Items]        
Profit before income tax and social contribution tax     4,570 2,011
Income tax and social contribution tax - nominal expense (34%)     (1,554) (683)
Tax effects applicable to:        
Gain (loss) in subsidiaries by equity method     8 (61)
Interest on Equity     136 71
Non-deductible contributions and donations     (13) (6)
Tax incentives     66 29
Effects from subsidiaries taxed based on gross revenues     89 89
Non-deductible penalties     (135) (12)
Impairment of accounts receivable from related parties     (234)
Others     38 (37)
Income tax and social contribution tax - effective expense     (1,599) (610)
Current tax R$ (583)   (1,454) [2] (583) [2]
Deferred tax R$ (27)   (145) [2],[3] (27) [2]
Income tax and social contribution tax - effective expense     R$ 1,599 R$ 610
Effective rate     35.00% 30.33%
[1] See note 2.8.
[2] For further details of restatement of comparative balances, see Note 2.8
[3] The basic and diluted earnings per share for the years ended in December 31, 2019 and 2018 were also adjusted retrospectively in order to reflect the increase in the number of shares in 2021. For more information, see Note 26.