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34. ASSETS AS HELD FOR SALE AND DISCONTINUED OPERATIONS (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of assets and liabilities classified as held for sale [line items]    
Assets   R$ 19,446
Liabilities   (16,272)
Net Asset   3,174
Attributed equity holders of the parent   1,818
Attributed to non-controlling interests   1,356
Net income from discontinued operations   363
Attributed to equity holders of the parent   322
Attributed to non-controlling interests   41
Net income from continuing operations  
Attributed to equity holders of the parent  
Attributed to non-controlling interests  
Investment Funds [Member]    
Disclosure of assets and liabilities classified as held for sale [line items]    
Assets R$ 1,258 19,446
Liabilities (16,272)
Net Asset 1,258 3,174
Attributed to discontinuing operations 224  
Attributed equity holders of the parent 1,258 1,818
Attributed to non-controlling interests 1,356
Net income from discontinued operations 224 73
Attributed to equity holders of the parent 224 32
Attributed to non-controlling interests 41
Net income from continuing operations 73
Attributed to equity holders of the parent 73
Attributed to non-controlling interests
Telecom Assets [Member]    
Disclosure of assets and liabilities classified as held for sale [line items]    
Net income from discontinued operations   290
Attributed to equity holders of the parent   290
Net income from continuing operations  
Attributed to equity holders of the parent  
Attributed to non-controlling interests