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Investments - Summary of Fair Value of Interest Acquired, and Remeasurement of Previous Equity Interest in Subsidiaries (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Nov. 30, 2018
Disclosure of detailed information about business combination [line items]    
Total consideration paid R$ 104  
Previously held interest, valued at fair value on the acquisition date 1,768 R$ 1,637
Total 1,872 3,455
Intangible - Right to exploitation of the regulated activity 602  
Fair value of other assets and liabilities identified 1,270  
Total 1,872  
Light [member]    
Disclosure of detailed information about business combination [line items]    
Total consideration paid 104  
Previously held interest, valued at fair value on the acquisition date 1,511 1,511
Total 1,615 3,198
Intangible - Right to exploitation of the regulated activity 475  
Fair value of other assets and liabilities identified 1,140  
Total 1,615  
Lightger [member]    
Disclosure of detailed information about business combination [line items]    
Previously held interest, valued at fair value on the acquisition date 257 126
Total 257 R$ 257
Intangible - Right to exploitation of the regulated activity 127  
Fair value of other assets and liabilities identified 130  
Total R$ 257