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Taxes - Demonstration of Income Tax and Social Contribution Expense (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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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)

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