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Assets And Liabilities Classified As Held For Sale; Profit (Loss) From Discontinued Operations - Schedule of Assets and Liabilities Classified as Held for Sale, and the Results of Discontinued Operations (Detail)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 31, 2018
BRL (R$)
R$ / shares
Disclosure of assets and liabilities classified as held for sale [line items]  
Assets R$ 19,446
Liabilities (16,272)
Net Asset 3,174
Attributed equity holders of the parent 1,818
Attributed to non-controlling interests 1,356
Net income (loss) from discontinued operations 363
Attributed to equity holders of the parent 322
Attributed to non-controlling interests R$ 41
Preferred shares [member]  
Disclosure of assets and liabilities classified as held for sale [line items]  
Basic and diluted earnings per common share from discontinued operations - R$ | R$ / shares R$ 22
Common shares [member]  
Disclosure of assets and liabilities classified as held for sale [line items]  
Basic and diluted earnings per common share from discontinued operations - R$ | R$ / shares R$ 22
Investment funds [member]  
Disclosure of assets and liabilities classified as held for sale [line items]  
Assets R$ 19,446
Liabilities (16,272)
Net Asset 3,174
Attributed equity holders of the parent 1,818
Attributed to non-controlling interests 1,356
Net income (loss) from discontinued operations 73
Attributed to equity holders of the parent 32
Attributed to non-controlling interests 41
Telecom assets [member]  
Disclosure of assets and liabilities classified as held for sale [line items]  
Net income (loss) from discontinued operations 290
Attributed to equity holders of the parent R$ 290