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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 34,749 |  |
Temporary differences, percentage | 100.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 4,391 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 100.00% |  |
Deferred tax assets | R$ 39,140 | R$ 51,002 | R$ 52,964
Deferred tax assets, percentage | 100.00% |  |
Deferred tax liabilities | R$ (6,806) |  |
Deferred tax liabilities, percentage | 100.00% |  |
Net deferred taxes | R$ 32,334 |  |
Net deferred taxes,percentage | 100.00% |  |
Present value of temporary differences | R$ 31,526 |  |
Present value of tax loss /social contribution loss carryforwards | 3,859 |  |
Present value of deferred tax assets | 35,384 |  |
Present value of deferred tax liabilities | (5,735) |  |
Present value of net deferred taxes | 29,649 |  |
Up to one year [Member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 10,808 |  |
Temporary differences, percentage | 31.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 1,394 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 32.00% |  |
Deferred tax assets | R$ 12,202 |  |
Deferred tax assets, percentage | 31.00% |  |
Deferred tax liabilities | R$ (1,333) |  |
Deferred tax liabilities, percentage | 20.00% |  |
Net deferred taxes | R$ 10,869 |  |
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$ 12,961 |  |
Temporary differences, percentage | 38.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 751 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 17.00% |  |
Deferred tax assets | R$ 13,712 |  |
Deferred tax assets, percentage | 35.00% |  |
Deferred tax liabilities | R$ (1,258) |  |
Deferred tax liabilities, percentage | 18.00% |  |
Net deferred taxes | R$ 12,454 |  |
Net deferred taxes,percentage | 39.00% |  |
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$ 4,575 |  |
Temporary differences, percentage | 13.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 614 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 14.00% |  |
Deferred tax assets | R$ 5,189 |  |
Deferred tax assets, percentage | 13.00% |  |
Deferred tax liabilities | R$ (432) |  |
Deferred tax liabilities, percentage | 6.00% |  |
Net deferred taxes | R$ 4,757 |  |
Net deferred taxes,percentage | 15.00% |  |
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$ 813 |  |
Temporary differences, percentage | 2.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 395 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 9.00% |  |
Deferred tax assets | R$ 1,208 |  |
Deferred tax assets, percentage | 3.00% |  |
Deferred tax liabilities | R$ (1,069) |  |
Deferred tax liabilities, percentage | 16.00% |  |
Net deferred taxes | R$ 139 |  |
Net deferred taxes,percentage | 0.00% |  |
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$ 685 |  |
Temporary differences, percentage | 2.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 157 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 3.00% |  |
Deferred tax assets | R$ 842 |  |
Deferred tax assets, percentage | 2.00% |  |
Deferred tax liabilities | R$ (142) |  |
Deferred tax liabilities, percentage | 2.00% |  |
Net deferred taxes | R$ 700 |  |
Net deferred taxes,percentage | 2.00% |  |
Over 5 years [Member] |  |  |
Disclosure of estimate of realization and present value of net deferred taxes [line items] |  |  |
Temporary differences | R$ 4,907 |  |
Temporary differences, percentage | 14.00% |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards | R$ 1,080 |  |
Deferred tax assets Tax loss /social contribution loss Carryforwards, percentage | 25.00% |  |
Deferred tax assets | R$ 5,987 |  |
Deferred tax assets, percentage | 16.00% |  |
Deferred tax liabilities | R$ (2,572) |  |
Deferred tax liabilities, percentage | 38.00% |  |
Net deferred taxes | R$ 3,415 |  |
Net deferred taxes,percentage | 11.00% |  |

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