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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 43,149 |  |
Temporary differences, percentage | 100.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 2,585 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 100.00% |  |
Deferred tax assets | R$ 45,734 | R$ 39,140 | R$ 51,002
Deferred tax assets, percentage | 100.00% |  |
Deferred tax liabilities | R$ (7,878) |  |
Deferred tax liabilities, percentage | 100.00% |  |
Net deferred taxes | R$ 37,856 |  |
Net deferred taxes,percentage | 100.00% |  |
Present value of temporary differences | R$ 40,354 |  |
Present value of tax loss /social contribution loss carryforwards | 2,381 |  |
Present value of deferred tax assets | 42,735 |  |
Present value of deferred tax liabilities | (6,923) |  |
Present value of net deferred taxes | 35,812 |  |
Up to one year [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 12,987 |  |
Temporary differences, percentage | 30.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 1,184 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 46.00% |  |
Deferred tax assets | R$ 14,171 |  |
Deferred tax assets, percentage | 31.00% |  |
Deferred tax liabilities | R$ (1,487) |  |
Deferred tax liabilities, percentage | 19.00% |  |
Net deferred taxes | R$ 12,684 |  |
Net deferred taxes,percentage | 33.00% |  |
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$ 10,614 |  |
Temporary differences, percentage | 25.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 177 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 7.00% |  |
Deferred tax assets | R$ 10,791 |  |
Deferred tax assets, percentage | 23.00% |  |
Deferred tax liabilities | R$ (614) |  |
Deferred tax liabilities, percentage | 8.00% |  |
Net deferred taxes | R$ 10,177 |  |
Net deferred taxes,percentage | 27.00% |  |
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$ 6,598 |  |
Temporary differences, percentage | 15.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 44 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 2.00% |  |
Deferred tax assets | R$ 6,642 |  |
Deferred tax assets, percentage | 15.00% |  |
Deferred tax liabilities | R$ (542) |  |
Deferred tax liabilities, percentage | 7.00% |  |
Net deferred taxes | R$ 6,100 |  |
Net deferred taxes,percentage | 16.00% |  |
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$ 4,276 |  |
Temporary differences, percentage | 10.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 37 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 1.00% |  |
Deferred tax assets | R$ 4,313 |  |
Deferred tax assets, percentage | 9.00% |  |
Deferred tax liabilities | R$ (284) |  |
Deferred tax liabilities, percentage | 3.00% |  |
Net deferred taxes | R$ 4,029 |  |
Net deferred taxes,percentage | 11.00% |  |
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$ 2,062 |  |
Temporary differences, percentage | 5.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 559 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 21.00% |  |
Deferred tax assets | R$ 2,621 |  |
Deferred tax assets, percentage | 6.00% |  |
Deferred tax liabilities | R$ (437) |  |
Deferred tax liabilities, percentage | 6.00% |  |
Net deferred taxes | R$ 2,184 |  |
Net deferred taxes,percentage | 6.00% |  |
Over 5 years [member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 6,612 |  |
Temporary differences, percentage | 15.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 584 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 23.00% |  |
Deferred tax assets | R$ 7,196 |  |
Deferred tax assets, percentage | 16.00% |  |
Deferred tax liabilities | R$ (4,514) |  |
Deferred tax liabilities, percentage | 57.00% |  |
Net deferred taxes | R$ 2,682 |  |
Net deferred taxes,percentage | 7.00% |  |

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