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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Major components of tax expense (income) [abstract] |  |  |  |
Net income before income tax and social contribution |  | R$ 31,243 | R$ 30,608 | R$ 30,582
Charges (income tax and social contribution) at the rates in effect |  | (12,497) | (13,774) | (13,762)
Increase / decrease in income tax and social contribution charges arising from: |  |  |  |
Share of profit or (loss) of associates and joint ventures net |  | 372 | 147 | 169
Foreign exchange variation on investments abroad |  | 711 | 4,381 | 397
Interest on capital |  | 3,012 | 3,791 | 3,873
Corporate reorganizations (Note 2.4 a IV) |  |  | 628 | 628
Dividends and interest on external debt bonds |  | 543 | 516 | 420
Other nondeductible expenses net of non taxable income | [1] | (1,233) | 1,747 | 3,736
Income tax and social contribution expenses |  | (9,092) | (2,564) | (4,539)
Related to temporary differences |  |  |  |
Increase (reversal) for the period |  | 5,750 | (2,650) | (2,888)
Increase (reversal) of prior periods |  | (88) | 245 | 70
(Expenses) / Income related to deferred taxes |  | 5,662 | (2,405) | (2,818)
Total income tax and social contribution expenses |  | R$ (3,430) | R$ (4,969) | R$ (7,357)
[1] | Includes temporary (additions) and exclusions.

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