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Contingent Assets and Liabilities, Provisions and Legal Obligations - Additional Information (Detail) - BRL (R$) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Provisions [Line Items] |  |  |
Provisions | R$ 21,454,000,000 | R$ 18,613,000,000 |
Amounts related to banking operation | 39,032,000,000 | 36,809,000,000 | R$ 34,448,000,000
Deductibility of losses in credit operations | 36,029,000,000 | 33,373,000,000 |
Receivables balance arising from reimbursements of contingencies | 978,000,000 | 999,000,000 |
Civil lawsuits [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Total estimated risk | 4,264,000,000 | 3,879,000,000 |
Provisions | 0 |  |
Labor claims [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Total estimated risk | 251,000,000 | R$ 177,000,000 |
Tax proceedings [member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Total estimated risk | 28,959,000,000 |  |
CSLL [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Provisions recognized for tax and social securities lawsuits | 1,389,000,000 |  |
Deposit balance | R$ 1,379,000,000 |  |
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$ 5,009,000,000 |  |
INSS [Member] | Social Security Contributions [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Deposit balance | 671,000,000 |  |
Non-compensatory amounts | 1,913,000,000 |  |
PIS and COFINS [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Provisions recognized for tax and social securities lawsuits | 640,000,000 |  |
Deposit balance | 611,000,000 |  |
Reversal of revenues from depreciation in excess | 2,199,000,000 |  |
Irpj Csll Pis And Cofins [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Funding expenses | 4,115,000,000 |  |
IRPJ and CSLL [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Goodwill - Deduction | 3,307 |  |
Deductibility of losses in credit operations | 1,164,000,000 |  |
Deductibility of losses in credit operations | 685,000,000 |  |
IRPJ [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Goodwill amount guaranteed in purchase agreements | 1,762,000,000 |  |
ISS [Member] |  |  |
Disclosure of Provisions [Line Items] |  |  |
Amounts related to banking operation | R$ 3,239,000,000 |  |

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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 2019-01-01 -Paragraph B67 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B67_d_ii&doctype=Appendix&subtype=B -URIDate 2019-03-27 + Details
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