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Assets And Liabilities Classified As Held For Sale; Profit (Loss) From Discontinued Operations - Summary of Results of Investments (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of assets and liabilities classified as held for sale [line items]      
NET REVENUE R$ 22,266 R$ 21,712 R$ 18,773
Share of (loss) profit of subsidiaries and joint ventures, and goodwill (104) (252) (302)
Income before finance income (expenses) and taxes 2,496 2,642 1,804
Finance income 1,706 804 1,041
Finance expenses (2,224) (1,800) (2,478)
Current income and social contribution taxes (583) (446) (174)
Deferred income and social contribution taxes (16) R$ (198) R$ 141
Net income 363    
Light [member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
NET REVENUE 1,052    
General costs and expenses (980)    
Share of (loss) profit of subsidiaries and joint ventures, and goodwill (9)    
Income before finance income (expenses) and taxes 63    
Finance income 92    
Finance expenses (44)    
Income before income and social contribution taxes 111    
Current income and social contribution taxes (14)    
Deferred income and social contribution taxes (38)    
Net income 59    
Lightger [member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
NET REVENUE 4    
General costs and expenses (2)    
Income before finance income (expenses) and taxes 2    
Income before income and social contribution taxes 2    
Net income 2    
Guanhaes [member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
NET REVENUE 1    
General costs and expenses 29    
Income before finance income (expenses) and taxes 30    
Income before income and social contribution taxes 30    
Net income 30    
Axxion [member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
NET REVENUE 6    
General costs and expenses (3)    
Income before finance income (expenses) and taxes 3    
Income before income and social contribution taxes 3    
Current income and social contribution taxes 5    
Net income 8    
Discontinued operations [member]      
Disclosure of assets and liabilities classified as held for sale [line items]      
NET REVENUE 1,063    
General costs and expenses (956)    
Share of (loss) profit of subsidiaries and joint ventures, and goodwill (9)    
Income before finance income (expenses) and taxes 98    
Finance income 92    
Finance expenses (44)    
Income before income and social contribution taxes 146    
Current income and social contribution taxes (9)    
Deferred income and social contribution taxes (38)    
Net income R$ 99