Income tax and social contribution - Schedule of Reconciliation of the effective income tax rate (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]
Profit (loss) before tax	R$ (4,213,208)	R$ (11,077,214)	R$ (2,536,265)
Tax rate effect of tax losses	34.00%	34.00%	34.00%
Tax expense (income) at applicable tax rate	R$ 1,432,491	R$ 3,766,253	R$ 862,330
Adjustments to determine the effective rate:
(Unrecorded) benefit on tax losses and temporary differences	(1,311,394)	(3,257,190)	(880,375)
Permanent differences	(116,876)	(244,011)	76,958
Taxation on universal bases	(4,221)	0	(10,341)
Offset against PERT	0	0	84,711
Others	0	(22,547)	(104)
Income tax and social contribution credit (expense)	0	(242,505)	(133,179)
Current income tax and social contribution	0	(11)	(2,228)
Deferred income tax and social contribution	0	242,516	135,407
Tax income (expense)	R$ 0	R$ 242,505	R$ 133,179
Tax rate effect from change in tax rate	0.00%	2.00%	5.00%

Tax effect of income (expense) not deductible in determining taxable profit (tax loss)

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Tax effect of tax recovery program

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Tax effect of universal bases

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The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The profit (loss) before tax expense or income. [Refer: Profit (loss)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit]

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The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]

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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate]

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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from tax losses. [Refer: Average effective tax rate; Applicable tax rate]

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