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11. INCOME AND SOCIAL CONTRIBUTION TAXES (Details 4) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Reconciliation Of Expense On Income And Social Contribution Taxes [abstract]      
Profit before income and Social Contribution taxes R$ 4,469 R$ 1,978 R$ 1,646
Income tax and Social Contribution tax - nominal expense (34%) (1,520) (672) (560)
Tax effects applicable to:      
Gain (loss) in subsidiaries by equity method (net of effects of Interest on Equity) 8 (61) (129)
Interest on Equity 136 71  
Gain on dilution of an equity interest     8
Non-deductible contributions and donations (13) (6) (6)
Tax incentives 66 29 11
Tax credits not recognized   (1)  
Effects from subsidiaries taxed based on gross revenues 89 89 81
Non-deductible penalties (135) (12) (14)
Impairment of accounts receivable from related parties (234)    
Excess reactive power and demand     (2)
Others 38 (36) (33)
Income tax and Social Contribution - effective gain (expense) (1,565) (599) (644)
Current tax (1,454) (583) (446)
Deferred tax (111) (16) (198)
Income tax and social contribution tax - effective expense R$ 1,565 R$ 599 R$ 644
Effective rate 35.03% 30.30% 39.13%