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Contingent Assets and Liabilities, Provisions and Legal Obligations - Additional Information (Detail) - BRL (R$) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2017
Disclosure of Provisions [Line Items] |  |  |  |
Provisions | R$ 18,613,000,000 | R$ 19,736,000,000 |  | R$ 20,909,000,000
Interest on capital | (3,791,000,000) | (3,873,000,000) | R$ (3,617,000,000) |
Amounts related to banking operation | 36,809,000,000 | 34,448,000,000 | R$ 31,918,000,000 |
Deductibility of losses in credit operations | 33,373,000,000 | 36,737,000,000 |  | R$ 36,763,000,000
Receivables balance arising from reimbursements of contingencies | 999,000,000 | 1,065,000,000 |  |
Civil lawsuits [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Total estimated risk | 3,879,000,000 | 3,494,000,000 |  |
Provisions | 0 |  |  |
Labor claims [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Total estimated risk | 177,000,000 | R$ 122,000,000 |  |
Tax proceedings [member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Total estimated risk | 27,530,000,000 |  |  |
CSLL [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Provisions recognized for tax and social securities lawsuits | 1,340,000,000 |  |  |
Deposit balance | R$ 1,324,000,000 |  |  |
CSLL [Member] | Bottom of range [member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
CSLL rate for financial and insurance companies | 9.00% |  |  |
CSLL [Member] | Top of range [member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
CSLL rate for financial and insurance companies | 15.00% |  |  |
INSS [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Non-compensatory amounts | R$ 5,373,000,000 |  |  |
INSS [Member] | Social Security Contributions [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Non-compensatory amounts | 660,000,000 |  |  |
PIS and COFINS [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Provisions recognized for tax and social securities lawsuits | 636,000,000 |  |  |
Deposit balance | 612,000,000 |  |  |
Reversal of revenues from depreciation in excess | 3,205,000,000 |  |  |
Irpj Csll Pis And Cofins [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Funding expenses | 3,930,000,000 |  |  |
IRPJ and CSLL [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Goodwill - Deduction | 2,704,000,000 |  |  |
Interest on capital | 1,510,000,000 |  |  |
Deductibility of losses in credit operations | 1,112,000,000 |  |  |
Deductibility of losses in credit operations | 757,000,000 |  |  |
IRPJ [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Goodwill amount guaranteed in purchase agreements | 1,695,000,000 |  |  |
ISS [Member] |  |  |  |
Disclosure of Provisions [Line Items] |  |  |  |
Amounts related to banking operation | R$ 1,166,000,000 |  |  |

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- Definition The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d_ii&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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