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24. Equity (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity Details Narrative Abstract        
Authorized capital R$ 15,000,000 R$ 15,000,000 R$ 15,000,000  
Minimum mandatory dividend per share and per ADS R$ .9851 R$ 0.87539 R$ 1.0240  
Additional proposed dividends R$ 118,859 R$ 105,543 R$ 123,557  
Withholding income tax recognized in current liabilities 58,258 52,004    
Interest on capital balance payable 673,765 598,612 R$ 700,034  
Interest on capital balance payable declared 673,328 598,336    
Interest on capital balance payable witheld income tax 437 276    
Investment reserve 3,840,422 6,939,296    
Subscribed and paid-in-capital     683,509,869 683,509,869
Surplus minimum mandatory 53,539      
Dividends R$ 792,187 R$ 703,879    
Dividend per common share R$ 1.1590 R$ 1.0298