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Taxes - Demonstration of Income Tax and Social Contribution Expense (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Major components of tax expense (income) [abstract]      
Income before income tax and social contribution R$ 30,608 R$ 30,582 R$ 35,679
Charges (income tax and social contribution) at the rates in effect (13,774) (13,762) (16,057)
Increase / decrease in income tax and social contribution charges arising from:      
Share of profit or (loss) of associates and joint ventures net 147 169 165
Foreign exchange variation on investments abroad 4,381 397 (4,313)
Interest on capital 3,791 3,873 3,617
Corporate reorganizations (Note 2.4 a IV) 628 628 628
Dividends and interest on external debt bonds 516 420 365
Other nondeductible expenses net of non taxable income 1,747 3,736 11,697
Income tax and social contribution expenses (2,564) (4,539) (3,898)
Related to temporary differences      
Increase (reversal) for the period (2,650) (2,888) (9,827)
Increase (reversal) of prior periods 245 70 62
(Expenses) / Income related to deferred taxes (2,405) (2,818) (9,765)
Total income tax and social contribution expenses R$ (4,969) R$ (7,357) R$ (13,663)