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16. INVESTMENTS (Details 10) - Centroeste [member]
R$ in Millions
Dec. 31, 2020
BRL (R$)
Disclosure of detailed information about investment property [line items]  
Gain on remeasurement of previously held equity interest in the subsidiaries acquired (51%) R$ 37
Bargain purchase - gain arising from the acquisition of the additional equity interest of 49% 14
Total R$ 51