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16. INVESTMENTS (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about investment property [abstract]    
Opening balances R$ 186 R$ 119
Dividends proposed by investees 399 285
Elimination of dividends due to business combination (1)
Dividends proposed by investee classified as held for sale 73
Adjustment of dividends proposed by investee classified as held for sale (1)
Withholding income tax on Interest on equity (8) (8)
Amounts received (387) (283)
Ending balances R$ 188 R$ 186