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25. PROVISIONS (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]      
Other provisions Beginning Balance R$ 1,888    
Additions 291    
Reversals (105)    
Settled / Reversal [1] (185)    
Provisions arising from business combination [2] 3    
Other provisions ending balance 1,892 R$ 1,888  
Restated [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 1,888 641 R$ 678
Additions   1,468 115
Reversals   (68) (64)
Settled   (153) (88)
Other provisions ending balance   1,888 641
Labour Provision [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 497 457 474
Additions 106 180 67
Reversals (60) (44) (25)
Settled   (96) (59)
Settled / Reversal [1] (116)    
Provisions arising from business combination [2]    
Other provisions ending balance 427 497 457
Customer Relations [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 19 19 18
Additions 22 21 17
Reversals (1)
Settled   (20) (16)
Settled / Reversal [1] (18)    
Provisions arising from business combination [2]    
Other provisions ending balance 23 19 19
Other Civil Actions [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 18 29 43
Additions 21 16 10
Reversals (12) (14)
Settled   (15) (10)
Settled / Reversal [1] (7)    
Provisions arising from business combination [2]    
Other provisions ending balance 32 18 29
Civil Cases [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 37 48 61
Additions 43 37 27
Reversals (13) (14)
Settled   (35) (26)
Settled / Reversal [1] (25)    
Provisions arising from business combination [2]    
Other provisions ending balance 55 37 48
Tax [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 1,260 52 57
Additions 113 1,236 5
Reversals (38) (8) (10)
Settled   (20)  
Settled / Reversal [1] (41)    
Provisions arising from business combination [2]    
Other provisions ending balance 1,294 1,260 52
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 36 37 40
Additions 16 2 8
Reversals (1) (10)
Settled   (2) (1)
Settled / Reversal [1]    
Provisions arising from business combination [2]    
Other provisions ending balance 52 36 37
Other [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance 58 46 46
Additions 13 13 7
Reversals (7) (1) (5)
Settled   (2)
Settled / Reversal [1] (3)    
Provisions arising from business combination [2] 3    
Other provisions ending balance R$ 64 R$ 58 46
Corporate [member]      
Disclosure of other provisions [line items]      
Other provisions Beginning Balance    
[1] This includes the amount of R$39, corresponding to the reversal of the contingency provisions relating to ICMS credits, recognized as recoverable taxes, due to a final judgment, against which there is no further appeal, in favor of the subsidiary Gasmig, on June 9, 2020.
[2] On January 13, 2020, the Company obtained the Centroeste control, which is consolidated as of 2020 first quarter. More details see note 16.