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Related Parties - Summary of Compensation and Benefits of Key Management Personnel (Detail) - Managers members, members of the audit committee and the board of directors [member] - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel R$ (1,092) R$ (960) R$ (899)
Fees [Member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel (499) (481) (426)
Employee profit sharing plan [member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel (363) (258) (244)
Post employment benefits [member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel (6) (9) (9)
Share-based payment plan [Member]      
Disclosure of transactions between related parties [line items]      
Compensation and benefits of key management personnel R$ (224) R$ (212) R$ (220)