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11. INCOME AND SOCIAL CONTRIBUTION TAXES (Details 2) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of deferred income and social contribution taxes [abstract]      
Beginning balance R$ 1,419 R$ 1,419 R$ 1,136
Effects allocated to net profit from continuing operations     (198)
Effect allocated to other comprehensive income 544   133
Effects allocated to Equity      
Effects allocated to net profit from continuing operations (111) (16)  
Effect allocated to other comprehensive income   239  
Effects allocated to net profit from discontinuing operations (note 34) (85)    
First-time adoption of IFRS 9 - effects allocated to equity   51  
Reversal of deemed cost   18  
Transfer to assets held for sale   (3)  
Variations in deferred tax assets and liabilities   (3) (14)
Deferred taxes arising from business combination   (3)  
Others 2    
Ending balance R$ 1,769 R$ 1,419 R$ 1,419