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17. CONCESSION CONTRACT ASSETS (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance at December 31, 2017 R$ 1,729
Effects of IFRS 15 first-time adoption   1,714
Additions 1,167 893
Inflation adjustment 34 88
Adjustment to expected contract cash flow from the concession 15 13
Amounts received (154) (161)
Disposals (6)  
Transfers to financial assets (92) (27)
Transfers to intangible assets (685) (750)
Transfers from PP&E   1
Impairment (3)  
Ending balance 2,005 1,729
Energy Transmission Segment [Member]    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance at December 31, 2017 1,129  
Effects of IFRS 15 first-time adoption   1,092
Additions 221 96
Inflation adjustment 34 88
Adjustment to expected contract cash flow from the concession 15 13
Amounts received (154) (161)
Disposals (4)  
Transfers to financial assets (44)  
Transfers from PP&E   1
Ending balance 1,197 1,129
Energy Distribution Segment [Member]    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Balance at December 31, 2017 518  
Effects of IFRS 15 first-time adoption   532
Additions 903 727
Transfers to financial assets (48) (27)
Transfers to intangible assets (630) (672)
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 82  
Effects of IFRS 15 first-time adoption   90
Additions 43 70
Disposals (2)  
Transfers to intangible assets (55) (78)
Ending balance R$ 68 R$ 82