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Taxes - Summary of Realization and Present Value of Tax Credits and From Provision for Deferred Income Tax and Social Contribution (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 51,569 |  |
Temporary differences, percentage | 100.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 3,751 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 100.00% |  |
Deferred tax assets | R$ 55,320 | R$ 61,623 | R$ 45,734
Deferred tax assets, percentage | 100.00% |  |
Deferred tax liabilities | R$ (4,769) |  |
Deferred tax liabilities, percentage | 100.00% |  |
Net deferred taxes | R$ 50,551 |  |
Net deferred taxes,percentage | 100.00% |  |
Present value of temporary differences | R$ 45,790 |  |
Present value of tax loss /social contribution loss carryforwards | 3,205 |  |
Present value of deferred tax assets | 48,995 |  |
Present value of deferred tax liabilities | (3,564) |  |
Present value of net deferred taxes | 45,431 |  |
Up to one year [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 14,278 |  |
Temporary differences, percentage | 27.70% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 637 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 17.00% |  |
Deferred tax assets | R$ 14,915 |  |
Deferred tax assets, percentage | 27.00% |  |
Deferred tax liabilities | R$ (151) |  |
Deferred tax liabilities, percentage | 3.20% |  |
Net deferred taxes | R$ 14,764 |  |
Net deferred taxes,percentage | 29.20% |  |
Later than one year and not later than two years [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 15,661 |  |
Temporary differences, percentage | 30.40% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 697 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 18.60% |  |
Deferred tax assets | R$ 16,358 |  |
Deferred tax assets, percentage | 29.60% |  |
Deferred tax liabilities | R$ (330) |  |
Deferred tax liabilities, percentage | 6.90% |  |
Net deferred taxes | R$ 16,028 |  |
Net deferred taxes,percentage | 31.70% |  |
Later than one year and not later than three years [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 9,883 |  |
Temporary differences, percentage | 19.20% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 581 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 15.50% |  |
Deferred tax assets | R$ 10,464 |  |
Deferred tax assets, percentage | 18.90% |  |
Deferred tax liabilities | R$ (64) |  |
Deferred tax liabilities, percentage | 1.30% |  |
Net deferred taxes | R$ 10,400 |  |
Net deferred taxes,percentage | 20.60% |  |
Later than three years and not later than four years [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 2,094 |  |
Temporary differences, percentage | 4.10% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 306 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 8.20% |  |
Deferred tax assets | R$ 2,400 |  |
Deferred tax assets, percentage | 4.30% |  |
Deferred tax liabilities | R$ (49) |  |
Deferred tax liabilities, percentage | 1.00% |  |
Net deferred taxes | R$ 2,351 |  |
Net deferred taxes,percentage | 4.70% |  |
Later than four years and not later than five years [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 2,002 |  |
Temporary differences, percentage | 3.90% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 312 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 8.30% |  |
Deferred tax assets | R$ 2,314 |  |
Deferred tax assets, percentage | 4.20% |  |
Deferred tax liabilities | R$ (95) |  |
Deferred tax liabilities, percentage | 2.00% |  |
Net deferred taxes | R$ 2,219 |  |
Net deferred taxes,percentage | 4.40% |  |
Over 5 years [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 7,651 |  |
Temporary differences, percentage | 14.70% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 1,218 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 32.40% |  |
Deferred tax assets | R$ 8,869 |  |
Deferred tax assets, percentage | 16.00% |  |
Deferred tax liabilities | R$ (4,080) |  |
Deferred tax liabilities, percentage | 85.60% |  |
Net deferred taxes | R$ 4,789 |  |
Net deferred taxes,percentage | 9.40% |  |

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