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Contingent Assets and Liabilities, Provisions and Legal Obligations - Summary of Changes in Civil, Labor and Other Risks Provisions (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Economic Plans [member]    
Disclosure of other provisions [line items]    
Increase in provision R$ (184) R$ 184