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15. CONCESSION CONTRACT ASSETS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Additions R$ 1,597    
Inflation adjustment 438    
Results of the Periodic Tariff Review 552    
Amounts received (623)    
Disposals (9)    
Transfers to financial assets (60)    
Transfers to intangible assets (906)    
Contract assets arising from business combination (Note 16d) 108    
Impairment (1)    
Ending balance 4,980    
Restated [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Balance at December 31, 2017 3,884 R$ 3,509  
Effects of IFRS 15 first-time adoption   1,258 R$ 3,549
Additions   328 935
Inflation adjustment   (473) 311
Amounts received   (2) (467)
Disposals   (48)  
Transfers to financial assets   (685) (27)
Transfers to intangible assets   (3) (750)
Impairment     (42)
Ending balance   3,884 3,509
Energy Transmission Segment [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Balance at December 31, 2017 3,076    
Additions 201    
Inflation adjustment 438    
Results of the Periodic Tariff Review 552    
Amounts received (623)    
Disposals (7)    
Contract assets arising from business combination (Note 16d) 108    
Ending balance 3,745 3,076  
Energy Transmission Segment [member] | Restated [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Balance at December 31, 2017 3,076 2,909  
Effects of IFRS 15 first-time adoption     2,927
Additions   312 138
Inflation adjustment   328 311
Amounts received   (473) (467)
Ending balance   3,076 2,909
Energy Distribution Segment [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Balance at December 31, 2017 740    
Additions 1,346    
Transfers to financial assets (60)    
Transfers to intangible assets (883)    
Impairment (1)    
Ending balance 1,142 740  
Energy Distribution Segment [member] | Restated [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Balance at December 31, 2017 740 518  
Effects of IFRS 15 first-time adoption     532
Additions   903 727
Transfers to financial assets     (27)
Transfers to intangible assets   (48) (672)
Transfers from PP&E   (630)  
Impairment   (3) (42)
Ending balance   740 518
Gas Segment [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Balance at December 31, 2017 68    
Additions 50    
Disposals (2)    
Transfers to intangible assets (23)    
Ending balance 93 68  
Gas Segment [member] | Restated [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Balance at December 31, 2017 R$ 68 82  
Effects of IFRS 15 first-time adoption     90
Additions   43 70
Disposals   (2)  
Transfers to intangible assets     (78)
Transfers from PP&E   (55)  
Ending balance   R$ 68 R$ 82