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Escrow Deposits - Schedule of Payments Related to Escrow Deposits (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of escrow deposits [Abstract]    
Labor claims R$ 304 R$ 259
Tax contingencies    
Income tax on Interest on Equity 27 24
Pasep and Cofins taxes (1) 1,337 746
ICMS (VAT) credits on PP&E   37
Donations and legacy tax (ITCD) 49 46
Urban property tax (IPTU) 80 80
Finsocial tax 37 37
Income and Social Contr. Tax on indemnity for employees' 'Anuênio' benefit 267 255
Others 117 60
Escrow deposits tax issues, Total 1,914 1,285
Others    
Monetary updating on AFAC - Minas Gerais state government (3)   239
Regulatory 60 60
Third party 16 13
Customer relations 6 6
Court embargo 14 8
Others 22 17
Escrow deposits other 118 343
Long term escrow deposit R$ 2,336 R$ 1,887