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14. FINANCIAL INSTRUMENTS (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Numnber
shares
Dec. 31, 2019
BRL (R$)
Numnber
shares
Disclosure of detailed information about financial instruments [line items]    
Closing Balance R$ 3,305,109 R$ 2,114,620
Fair value adjustment recognized in profit or loss R$ 1,190,489 R$ (136,004)
USIM3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) | shares 107,156,651 107,156,651
Equity interest (%) 15.19 15.19
Share price | Numnber 15.69 9.87
Closing Balance R$ 1,681,288 R$ 1,057,636
Fair value adjustment recognized in profit or loss R$ 623,652 R$ (168,236)
USIM5 [member]    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) | shares 111,144,456 111,144,456
Equity interest (%) 20.29 20.29
Share price | Numnber 14.61 9.51
Closing Balance R$ 1,623,821 R$ 1,056,984
Fair value adjustment recognized in profit or loss R$ 566,837 R$ 32,232
PATI3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Quantity (in shares) | shares 2,065,529 2,065,529
Equity interest (%) 11.31 11.31
Share price | Numnber 28.99 22.90
Closing Balance R$ 59,879 R$ 47,300
Fair value adjustment recognized in profit or loss 12,579 17,224
Total shares [member]    
Disclosure of detailed information about financial instruments [line items]    
Closing Balance 3,364,988 2,161,920
Fair value adjustment recognized in profit or loss R$ 1,203,068 R$ (118,780)