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Concession Contract Assets - Summary of Detailed Information about Concession Contract Assets (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Contract assets R$ 1,729  
Current 131  
Non current 1,598  
Distribution - Infrastructure assets under construction [member]    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Contract assets 518  
Gas - Infrastructure assets under construction [member]    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Contract assets 82  
Transmission - Indemnity assets incorporated into the Assets Remuneration Base [member]    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Contract assets 492 R$ 544
Transmission - Assets remunerated by tariff [member]    
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]    
Contract assets R$ 637 R$ 548