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8. INVESTMENTS (Details 4) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current assets        
Cash and cash equivalents R$ 3,411,572 R$ 4,871,162 R$ 7,861,052 R$ 8,686,021
Advances to suppliers 12,514 3,168    
Total current assets 11,881,496 12,444,918    
Non-current assets        
Investments, PP&E and intangible assets 17,964,839 18,135,879 17,826,226  
Tota non-current assets 33,328,474 31,708,705    
Total assets 45,209,970 44,153,623    
Current liabilities        
Borrowings and financing 6,526,902 2,117,448    
Total current liabilities 10,670,050 5,496,683    
Non-current liabilities        
Borrowings and financing 22,983,942 28,323,570    
Total non-current liabilities 26,251,691 31,272,419    
Shareholders' equity 8,288,229 7,384,521 R$ 7,091,288 R$ 5,734,975
Total liabilities and shareholders' equity 45,209,970 44,153,623    
Ita Energetica | Joint Operation        
Current assets        
Cash and cash equivalents 16,231 17,689    
Advances to suppliers 22 99    
Other current assets 16,447 16,054    
Total current assets 32,700 33,842    
Non-current assets        
Other non-current assets 27,459 29,219    
Investments, PP&E and intangible assets 484,406 516,186    
Tota non-current assets 511,865 545,405    
Total assets 544,565 579,247    
Current liabilities        
Borrowings and financing 0 0    
Other current liabilities 33,666 53,858    
Total current liabilities 33,666 53,858    
Non-current liabilities        
Borrowings and financing 0 0    
Other non-current liabilities 3,471 3,020    
Total non-current liabilities 3,471 3,020    
Shareholders' equity 507,428 522,369    
Total liabilities and shareholders' equity 544,565 579,247    
Joint Venture | MRS Logistica        
Current assets        
Cash and cash equivalents 484,978 345,164    
Advances to suppliers 14,911 7,452    
Other current assets 685,311 406,170    
Total current assets 1,185,200 758,786    
Non-current assets        
Other non-current assets 693,434 598,577    
Investments, PP&E and intangible assets 6,277,550 6,215,442    
Tota non-current assets 6,970,984 6,814,019    
Total assets 8,156,184 7,572,805    
Current liabilities        
Borrowings and financing 668,947 653,491    
Other current liabilities 1,272,365 740,319    
Total current liabilities 1,941,312 1,393,810    
Non-current liabilities        
Borrowings and financing 2,084,422 2,176,357    
Other non-current liabilities 575,170 699,830    
Total non-current liabilities 2,659,592 2,876,187    
Shareholders' equity 3,555,280 3,302,808    
Total liabilities and shareholders' equity 8,156,184 7,572,805    
Joint Venture | CBSI        
Current assets        
Cash and cash equivalents 101 2,925    
Advances to suppliers 37 951    
Other current assets 28,475 19,603    
Total current assets 28,613 23,479    
Non-current assets        
Other non-current assets 974 234    
Investments, PP&E and intangible assets 2,423 3,434    
Tota non-current assets 3,397 3,668    
Total assets 32,010 27,147    
Current liabilities        
Borrowings and financing 1,411 0    
Other current liabilities 25,898 23,034    
Total current liabilities 27,309 23,034    
Non-current liabilities        
Borrowings and financing 0 0    
Other non-current liabilities 0 0    
Total non-current liabilities 0 0    
Shareholders' equity 4,701 4,113    
Total liabilities and shareholders' equity 32,010 27,147    
Joint Venture | Transnordestina Logistica        
Current assets        
Cash and cash equivalents 5,763 1,899    
Advances to suppliers 0 0    
Other current assets 49,494 54,652    
Total current assets 55,257 56,551    
Non-current assets        
Other non-current assets 238,004 261,292    
Investments, PP&E and intangible assets 7,927,881 7,407,189    
Tota non-current assets 8,165,885 7,668,481    
Total assets 8,221,142 7,725,032    
Current liabilities        
Borrowings and financing 52,691 76,441    
Other current liabilities 113,739 134,747    
Total current liabilities 166,430 211,188    
Non-current liabilities        
Borrowings and financing 5,457,768 5,024,404    
Other non-current liabilities 434 0    
Total non-current liabilities 5,458,202 5,024,404    
Shareholders' equity 2,596,510 2,489,440    
Total liabilities and shareholders' equity R$ 8,221,142 R$ 7,725,032