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Concession Financial Assets and Liabilities - Summary of Changes in Concession Financial Assets (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]      
Additions R$ 25 R$ 2,271 R$ 146
Transfers   (165)  
Amounts received (234) (314)  
Monetary updating 317 352  
Adjustment of BRR of Transmission Assets (Note 26) (149)    
Infrastructure [Member]      
Disclosure of financial assets [line items]      
Beginning Balance 5,303 2,184 7,216
Additions 25 55 146
Transfers of indemnity - plants not renewed 1,082    
Addition - Grant Fee - Plants   2,216  
Disposals (2) (3) (37)
Transfer from Financial assets to Intangible assets on renewal of concessions     (7,162)
Transfers     806
Generation residual value receivable     546
Amounts received (496) (331) (10)
Transfers between PP&E, Financial assets and Intangible Assets 148 71  
Monetary updating 541 751  
Updating of the Concession Grant Fee   352  
Adjustment of expectation of cash flow from the Concession financial assets 63 8 578
Updating of residual value of assets     101
Adjustment of BRR of Transmission Assets (Note 26) 149    
Adjustment on indemnities of plants not renewed (Ministerial Order 291) - including financial updating 271    
Ending Balance 7,084 5,303 2,184
Infrastructure [Member] | Transmission [member]      
Disclosure of financial assets [line items]      
Beginning Balance 2,287 1,501 1,272
Additions 25 54 146
Disposals (2) (3) (6)
Transfers     (2)
Amounts received (264) (16) (10)
Transfers between PP&E, Financial assets and Intangible Assets 2    
Monetary updating 224 751  
Adjustment of expectation of cash flow from the Concession financial assets 54    
Updating of residual value of assets     101
Adjustment of BRR of Transmission Assets (Note 26) 149    
Ending Balance 2,475 2,287 1,501
Infrastructure [Member] | Generation [member]      
Disclosure of financial assets [line items]      
Beginning Balance 2,800 546  
Additions   1  
Transfers of indemnity - plants not renewed 1,082    
Addition - Grant Fee - Plants   2,216  
Generation residual value receivable     546
Amounts received (232) (315)  
Monetary updating 317    
Updating of the Concession Grant Fee   352  
Adjustment on indemnities of plants not renewed (Ministerial Order 291) - including financial updating 271    
Ending Balance 4,238 2,800 546
Infrastructure [Member] | Distribution [member]      
Disclosure of financial assets [line items]      
Beginning Balance 216 137 5,944
Disposals     (31)
Transfer from Financial assets to Intangible assets on renewal of concessions     (7,162)
Transfers     808
Transfers between PP&E, Financial assets and Intangible Assets 146 71  
Adjustment of expectation of cash flow from the Concession financial assets 9 8 578
Ending Balance R$ 371 R$ 216 R$ 137