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2. BASIS OF PREPARATION (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Apr. 30, 2021
Jan. 02, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
BasisOfPreparationLineItems [Line Items]          
NET INCOME FOR THE YEAR R$ 2,864   R$ 2,865 R$ 3,194 [1] R$ 1,764 [1]
OTHER COMPREHENSIVE INCOME          
COMPREHENSIVE INCOME FOR THE YEAR     2,858    
Total of comprehensive income for the year attributed to:          
Equity holders of the parent     2,857    
Non-controlling interests     1    
COMPREHENSIVE INCOME FOR THE YEAR     R$ 2,858    
As presented [member]          
BasisOfPreparationLineItems [Line Items]          
NET INCOME FOR THE YEAR   R$ 1,742   3,128 1,742
OTHER COMPREHENSIVE INCOME          
Items not to be reclassified to profit or loss in subsequent periods       (1,055) (463)
COMPREHENSIVE INCOME FOR THE YEAR       2,073 1,279
Total of comprehensive income for the year attributed to:          
Equity holders of the parent       2,072 1,237
Non-controlling interests       1 42
COMPREHENSIVE INCOME FOR THE YEAR       2,073 1,279
Adjustment [member]          
BasisOfPreparationLineItems [Line Items]          
NET INCOME FOR THE YEAR   22   65 22
OTHER COMPREHENSIVE INCOME          
Items not to be reclassified to profit or loss in subsequent periods      
COMPREHENSIVE INCOME FOR THE YEAR       67 22
Total of comprehensive income for the year attributed to:          
Equity holders of the parent       66 22
Non-controlling interests      
COMPREHENSIVE INCOME FOR THE YEAR       67 22
Restated [member]          
BasisOfPreparationLineItems [Line Items]          
NET INCOME FOR THE YEAR   R$ 1,764 [1]   3,195 [2] 1,764 [2]
OTHER COMPREHENSIVE INCOME          
Items not to be reclassified to profit or loss in subsequent periods       (1,055) (463)
COMPREHENSIVE INCOME FOR THE YEAR [2]       2,140 1,301
Total of comprehensive income for the year attributed to:          
Equity holders of the parent [2]       2,139 1,259
Non-controlling interests [2]       1 42
COMPREHENSIVE INCOME FOR THE YEAR [2]       R$ 2,140 R$ 1,301
[1] See note 2.8.
[2] For further details of restatement of comparative balances, see Note 2.8