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Assets And Liabilities Classified As Held For Sale; Profit (Loss) From Discontinued Operations - Additional Information (Detail) - BRL (R$)
R$ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2018
Dec. 31, 2018
Telecom assets [member]    
Disclosure of assets and liabilities classified as held for sale [line items]    
Gain on sale of assets   R$ 378
Cash paid for sale of Asset R$ 655  
Carrying value of these asset R$ 277  
Lot 1 [member]    
Disclosure of assets and liabilities classified as held for sale [line items]    
Winning bid amount in tender   R$ 576
Percentage of above minimum sale value specified in tender announcement   71.87%
Lot 2 [member]    
Disclosure of assets and liabilities classified as held for sale [line items]    
Winning bid amount in tender   R$ 79
Percentage of above minimum sale value specified in tender announcement   141.05%