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16. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Additions R$ 1,167 R$ 893  
Amounts received (250) (250) R$ (234)
Monetary updating 317 322 317
Infrastructure [Member]      
Disclosure of financial assets [line items]      
Beginning Balance 4,917 7,084 5,303
Effects of first - time adoption of IFRS   (1,092)  
Additions     25
Transfers of indemnity - plants not renewed     1,082
Amounts received (440) (1,638) (496)
Transfers between PP&E, Financial assets and Intangible assets     148
Transfers from PP&E   27  
Transfers from (to) intangible assets 23    
Transfers from contract assets 92  
Others transfers   (2)  
Monetary updating 458 539 541
Adjustment of expectation of cash flow from the Concession financial assets     63
Disposals (1) (1) (2)
Adjustment of BRR of Transmission Assets     149
Adjustment on indemnities of plants not renewed (Ministerial Order 291) - including financial updating     271
Ending Balance 5,049 4,917 7,084
Infrastructure [Member] | Transmission [Member]      
Disclosure of financial assets [line items]      
Beginning Balance 1,296 2,475 2,287
Effects of first - time adoption of IFRS   (1,092)  
Additions     25
Amounts received (181) (249) (264)
Transfers between PP&E, Financial assets and Intangible assets     2
Transfers from PP&E    
Transfers from contract assets 44    
Others transfers    
Monetary updating 122 162 224
Adjustment of expectation of cash flow from the Concession financial assets     54
Disposals (2)
Adjustment of BRR of Transmission Assets     149
Ending Balance 1,281 1,296 2,475
Infrastructure [Member] | Generation [Member]      
Disclosure of financial assets [line items]      
Beginning Balance 3,225 4,238 2,800
Transfers of indemnity - plants not renewed     1,082
Amounts received (259) (1,389) (232)
Transfers from PP&E    
Transfers from contract assets    
Others transfers   (1)  
Monetary updating 318   317
Disposals  
Adjustment on indemnities of plants not renewed (Ministerial Order 291) - including financial updating     271
Ending Balance 3,284 3,225 4,238
Infrastructure [Member] | Distribution [Member]      
Disclosure of financial assets [line items]      
Beginning Balance 396 371 216
Transfers between PP&E, Financial assets and Intangible assets     146
Transfers from PP&E   27  
Transfers from (to) intangible assets (1)    
Transfers from contract assets 48    
Others transfers   (1)  
Monetary updating 18    
Adjustment of expectation of cash flow from the Concession financial assets     9
Disposals (1) (1)  
Ending Balance 460 396 R$ 371
Infrastructure [Member] | Gas [Member]      
Disclosure of financial assets [line items]      
Beginning Balance    
Transfers from PP&E    
Transfers from (to) intangible assets 24    
Transfers from contract assets    
Others transfers  
Disposals  
Ending Balance R$ 24