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18. INVESTMENTS (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about investment property [abstract]    
Opening balances R$ 120 R$ 77
Dividends proposed by investees 285 354
Dividends proposed by investee classified as held for sale 73  
Withholding income tax on Interest on equity (8) (7)
Amounts received (283) (304)
Ending balances R$ 186 R$ 120