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Concession Financial and Sector Assets and Liabilities - Summary of Changes in Concession Financial Assets Related to Infrastructure (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]      
Additions R$ 893 R$ 25 R$ 2,271
Amounts received (250) (234)  
Monetary updating 322 317  
Adjustment of BRR of Transmission Assets (149)    
Infrastructure [member]      
Disclosure of financial assets [line items]      
Beginning Balance 7,084 5,303  
Effects of first-time adoption of IFRS (15.1, 15.3) (1,092)    
Additions   25  
Transfers of indemnity - plants not renewed   1,082  
Amounts received (1,638) (496)  
Transfers between PP&E, Financial assets and Intangible assets   148  
Transfers between PP&E and concession contract assets 27    
Others transfers (2)    
Monetary updating 539 541  
Adjustment of expectation of cash flow from the Concession financial assets   63  
Disposals (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 4,917 7,084 5,303
Infrastructure [member] | Transmission [member]      
Disclosure of financial assets [line items]      
Beginning Balance 2,475 2,287  
Effects of first-time adoption of IFRS (15.1, 15.3) (1,092)    
Additions   25  
Amounts received (249) (264)  
Transfers between PP&E, Financial assets and Intangible assets   2  
Monetary updating 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 1,296 2,475 2,287
Infrastructure [member] | Generation [member]      
Disclosure of financial assets [line items]      
Beginning Balance 4,238 2,800  
Transfers of indemnity - plants not renewed   1,082  
Amounts received (1,389) (232)  
Others transfers (1)    
Monetary updating 377 317  
Adjustment on indemnities of plants not renewed (Ministerial Order 291) - including financial updating   271  
Ending Balance 3,225 4,238 2,800
Infrastructure [member] | Distribution [member]      
Disclosure of financial assets [line items]      
Beginning Balance 371 216  
Transfers between PP&E, Financial assets and Intangible assets   146  
Transfers between PP&E and concession contract assets 27    
Others transfers (1)    
Adjustment of expectation of cash flow from the Concession financial assets   9  
Disposals (1)    
Ending Balance R$ 396 R$ 371 R$ 216