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27. PROVISIONS (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Other provisions Beginning Balance R$ 641 R$ 678 R$ 815
Additions 1,468 115 278
Reversals (68) (64) (286)
Settled (153) (88) (129)
Other provisions ending balance 1,888 641 678
Labour Provision [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 457 474 350
Additions 180 67 210
Reversals (44) (25) (4)
Settled (96) (59) (82)
Other provisions ending balance 497 457 474
Customer Relations [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 19 18 15
Additions 21 17 21
Reversals (1) (2)
Settled (20) (16) (16)
Other provisions ending balance 19 19 18
Other Civil Actions [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 29 43 40
Additions 16 10 10
Reversals (12) (14) (2)
Settled (15) (10) (5)
Other provisions ending balance 18 29 43
Civil Cases [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 48 61 55
Additions 37 27 31
Reversals (13) (14) (4)
Settled (35) (26) (21)
Other provisions ending balance 37 48 61
Tax [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 52 57 68
Additions 1,236 5 9
Reversals (8) (10) (2)
Settled (20)   (18)
Other provisions ending balance 1,260 52 57
Environmental [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 1  
Additions 1  
Reversals (1)  
Settled  
Other provisions ending balance 1
Regulatory [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 37 40 44
Additions 2 8 15
Reversals (1) (10) (18)
Settled (2) (1) (1)
Other provisions ending balance 36 37 40
Other [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 46 46 59
Additions 13 7 13
Reversals (1) (5) (19)
Settled (2) (7)
Other provisions ending balance R$ 58 46 46
Corporate [Member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance   239
Additions    
Reversals     (239)
Settled    
Other provisions ending balance