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14. CONCESSION FINANCIAL AND SECTOR ASSETS AND LIABILITIES (Details 1) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]      
Amounts received R$ (265) R$ (250) R$ (250)
Monetary updating 347 317 322
Restated [member]      
Disclosure of financial assets [line items]      
Beginning Balance   3,621 7,084
Effects of first-time adoption of IFRS 15 (Restated)     (2,475)
Amounts received     (1,389)
Others transfers     (2)
Ending Balance     3,621
Infrastructure [member]      
Disclosure of financial assets [line items]      
Beginning Balance 3,768 3,621  
Amounts received (266)    
Transfers from contract assets 60 48  
Transfers from (to) intangible assets (5) 23  
Monetary updating 367 336 377
Disposals   (1) (1)
Transfers from PP&E     27
Ending Balance 3,924 3,768 3,621
Infrastructure [member] | Restated [member]      
Disclosure of financial assets [line items]      
Beginning Balance 3,768 3,621  
Amounts received   (259)  
Ending Balance   3,768 3,621
Infrastructure [member] | Transmission [member]      
Disclosure of financial assets [line items]      
Beginning Balance  
Amounts received    
Transfers from contract assets  
Transfers from (to) intangible assets  
Monetary updating
Disposals  
Transfers from PP&E    
Ending Balance
Infrastructure [member] | Transmission [member] | Restated [member]      
Disclosure of financial assets [line items]      
Beginning Balance 2,475
Effects of first-time adoption of IFRS 15 (Restated)     (2,475)
Amounts received  
Others transfers    
Ending Balance  
Infrastructure [member] | Generation [member]      
Disclosure of financial assets [line items]      
Beginning Balance 3,284 3,225  
Amounts received (266)    
Transfers from contract assets    
Transfers from (to) intangible assets    
Monetary updating 347 318 377
Disposals  
Transfers from PP&E    
Ending Balance 3,365 3,284 3,225
Infrastructure [member] | Generation [member] | Restated [member]      
Disclosure of financial assets [line items]      
Beginning Balance 3,284 3,225 4,238
Effects of first-time adoption of IFRS 15 (Restated)    
Amounts received   (259) (1,389)
Others transfers     (1)
Ending Balance   3,284 3,225
Infrastructure [member] | Distribution [member]      
Disclosure of financial assets [line items]      
Beginning Balance 460 396  
Amounts received    
Transfers from contract assets 60 48  
Transfers from (to) intangible assets (5) (1)  
Monetary updating 15 18
Disposals   (1) (1)
Transfers from PP&E     27
Ending Balance 530 460 396
Infrastructure [member] | Distribution [member] | Restated [member]      
Disclosure of financial assets [line items]      
Beginning Balance 460 396 371
Effects of first-time adoption of IFRS 15 (Restated)    
Amounts received  
Others transfers     (1)
Ending Balance   460 396
Infrastructure [member] | Gas [member]      
Disclosure of financial assets [line items]      
Beginning Balance 24  
Amounts received    
Transfers from contract assets    
Transfers from (to) intangible assets   24  
Monetary updating 5
Disposals  
Transfers from PP&E    
Ending Balance 29 24
Infrastructure [member] | Gas [member] | Restated [member]      
Disclosure of financial assets [line items]      
Beginning Balance R$ 24
Effects of first-time adoption of IFRS 15 (Restated)    
Amounts received  
Others transfers    
Ending Balance   R$ 24