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Goodwill and Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]        
Contractual commitments for purchase of new intangible assets R$ 637 R$ 984 R$ 262  
Hyperinflationary [member]        
Disclosure of detailed information about intangible assets [line items]        
Amortization other 31      
Acquisition of payrolls and associations rights [member]        
Disclosure of detailed information about intangible assets [line items]        
Amortization expense R$ (452) R$ (487) R$ (524) R$ (357)