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Taxes - Summary of Tax Liabilities (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure Of Tax Liabilities [Abstract]      
Taxes and contributions on income payable R$ 615 R$ 1,752  
Other Taxes and Contributions payable 1,443 1,423  
Provision for deferred income tax and social contribution (Note 24b II) 447 391 R$ (289)
Other 2,779 4,270 3,498
Tax liabilities R$ 5,284 R$ 7,836 R$ 4,950