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11. INCOME AND SOCIAL CONTRIBUTION TAXES (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of income and social contribution taxes [abstract]    
Income tax R$ 608 R$ 253
Social contribution tax 241 140
Income and social contribution tax credits 849 393
Current 621 387
Non-current 228 6
Current    
Income tax 99 83
Social contribution tax 35 29
Total R$ 134 R$ 112