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12 FINANCIAL INSTRUMENTS (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
R$ / shares
shares
Dec. 31, 2018
BRL (R$)
R$ / shares
shares
Disclosure of detailed information about financial instruments [line items]    
Closing Balance R$ 2,161,920 R$ 2,279,189
Fair Value Adjustment Recognized in profit or loss R$ (118,780)  
USIM3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) | shares 107,156,651 107,156,651
Interest (%) 15.19 15.19
Share price | R$ / shares 9.87 11.44
Closing Balance R$ 1,057,636 R$ 1,225,872
Fair Value Adjustment Recognized in profit or loss R$ (168,236)  
USIM5 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) | shares 111,144,456 111,144,456
Interest (%) 29.29 29.29
Share price | R$ / shares 9.51 9.22
Closing Balance R$ 1,056,984 R$ 1,024,751
Fair Value Adjustment Recognized in profit or loss 32,232  
Total Shares [Member]    
Disclosure of detailed information about financial instruments [line items]    
Closing Balance 2,114,620 R$ 2,250,623
Fair Value Adjustment Recognized in profit or loss R$ (136,004)  
PATI3 [Member]    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) | shares 2,065,529 1,997,642
Interest (%) 11.31 11.33
Share price | R$ / shares 22.90 14.30
Closing Balance R$ 47,300 R$ 28,566
Fair Value Adjustment Recognized in profit or loss R$ 17,224