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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Major components of tax expense (income) [abstract] |  |  |  |
Income / (loss) before income tax and social contribution |  | R$ 42,231 | R$ 5,230 | R$ 31,243
Charges (income tax and social contribution) at the rates in effect | [1] | (19,989) | (2,354) | (12,497)
Increase / decrease in income tax and social contribution charges arising from: |  |  |  |
Share of profit or (loss) of associates and joint ventures |  | 821 | 384 | 614
Foreign exchange variation on investments abroad |  | 437 | 7,201 | 711
Interest on capital |  | 2,889 | 2,765 | 3,012
Other nondeductible expenses net of non taxable income | [2] | 9,181 | (16,651) | (932)
Income tax and social contribution expenses |  | (6,661) | (8,655) | (9,092)
Related to temporary differences |  |  |  |
Increase (reversal) for the period |  | (7,186) | 18,489 | 5,750
Increase (reversal) of prior periods |  |  |  | (88)
(Expenses) / Income from deferred taxes |  | (7,186) | 18,489 | 5,662
Total income tax and social contribution expenses |  | R$ (13,847) | R$ 9,834 | R$ (3,430)
[1] | It considers that in the first half of 2021 the current IRPJ and CSLL rate is equal to 45% and, in the second half of 2021, it is equal to 50%.
[2] | Includes temporary (additions) and exclusions.

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