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22. Equity (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity Details Narrative      
Authorized capital R$ 15,000,000 R$ 15,000,000  
Minimum mandatory dividend per share and per ADS R$ .87539 R$ 1.0240 R$ .1863
Additional proposed dividends R$ 105,543 R$ 123,557 R$ 22,527
Withholding income tax recognized in current liabilities 52,004 60,838  
Interest on capital balance payable 598,612 700,034  
Interest on capital balance payable declared 598,336 699,936  
Interest on capital balance payable witheld income tax 276 98  
Investment reserve 6,939,296 R$ 5,249,830  
Reallocation of retained earnings to investment reserve account 1,689,466    
Subscribed and paid-in-capital   683,509,869 683,509,869
Surplus minimum mandatory 62,719    
Dividends R$ 703,879 R$ 823,493  
Dividend per common share R$ 1.0298 R$ 1.2048