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10. INCOME AND SOCIAL CONTRIBUTION TAXES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of income and social contribution taxes [abstract]    
Income tax R$ 698 R$ 608
Social contribution tax 247 241
Income and social contribution tax credits 945 849
Current 598 621
Non-current 347 228
Current    
Income tax 108 99
Social contribution tax 32 35
Total R$ 140 R$ 134