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13. FINANCIAL INSTRUMENTS (Details 2) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Quantity (in shares) 220,298,749 223,434,849  
Closing Balance R$ 2,279,189 R$ 2,222,433  
Fair Value Adjustment Recognized in profit or loss 96,133  
Reclassification of Comprehensive Income for the year (note 31) R$ (1,655,813) R$ 0 R$ 0
Sale of shares, quantity 3,136,100    
Sale of shares, share price R$ 12.56    
Sale of shares, Cash Received R$ 39,377    
USIM3      
Disclosure of detailed information about financial instruments [line items]      
Quantity (in shares) 107,156,651 107,156,651  
Share price R$ 11.44 R$ 10.83  
Closing Balance R$ 1,225,872 R$ 1,160,506  
Fair Value Adjustment Recognized in profit or loss 65,366    
Reclassification of Comprehensive Income for the year (note 31) R$ 694,685    
USIM5      
Disclosure of detailed information about financial instruments [line items]      
Quantity (in shares) 111,144,456 114,280,556  
Share price R$ 9.22 R$ 9.10  
Closing Balance R$ 1,024,752 R$ 1,039,953  
Fair Value Adjustment Recognized in profit or loss 24,176    
Reclassification of Comprehensive Income for the year (note 31) R$ 865,264    
Sale of shares, quantity 3,136,100    
Sale of shares, share price R$ 12.56    
Sale of shares, Cash Received R$ 39,377    
PATI3      
Disclosure of detailed information about financial instruments [line items]      
Quantity (in shares) 1,997,642 1,997,642  
Share price R$ 14.30 R$ 11.00  
Closing Balance R$ 28,565 R$ 21,974  
Fair Value Adjustment Recognized in profit or loss 6,591    
Reclassification of Comprehensive Income for the year (note 31) R$ (269)