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Related Parties - Summary of Compensation and Benefits of Key Management Personnel (Detail) - Management members, members of the audit committee and the board of directors [member] - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel R$ (960) R$ (899) R$ (886)
Fees [Member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel (481) (426) (360)
Employee profit sharing plan [member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel (258) (244) (251)
Post employment benefits [member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel (9) (9) (12)
Granting of the Share-based payment [Member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel R$ (212) R$ (220) R$ (263)