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