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Escrow Deposits - Schedule of Payments Related to Escrow Deposits (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of escrow deposits [abstract]    
Labor claims R$ 335 R$ 304
Tax contingencies    
Income tax on Interest on Equity 28 27
Pasep and Cofins taxes 1,402 1,337
Donations and legacy tax (ITCD) 51 49
Urban property tax (IPTU) 87 80
Finsocial tax 38 37
Income and Social Contr. Tax on indemnity for employees' 'Anuênio' benefit 275 267
Income tax withheld at source on inflationary profit 8  
Contribution tax effective rate 18  
Others 156 117
Escrow deposits tax issues 2,063 1,914
Others    
Regulatory 53 60
Third party 9 16
Customer relations 6 6
Court embargo 12 14
Others 24 22
Escrow deposits other 104 118
Long term escrow deposit R$ 2,502 R$ 2,336