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Goodwill and Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Contractual commitments for purchase of new intangible assets R$ 273 R$ 637  
Hyperinflationary [member]      
Disclosure of detailed information about intangible assets [line items]      
Amortization other 3 31  
Acquisition of payrolls and associations rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Amortization expense R$ (519) R$ (452) R$ (487)