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Risk and Capital Management - Summary of Risk Level of Financial Assets (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at fair value through profit or loss | 85.20% | 82.80%
Total Percentage | 100.00% | 100.00%
Financial assets at amortised cost | R$ 1,010,644 | R$ 994,759
Financial assets at fair value through profit or loss | 322,929 | 286,646
Financial Assets | R$ 1,501,481 | R$ 1,424,876
Interbank deposits and securities purchased under agreements to resell [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Percentage of fainancial assets at amortized cost | 1.30% | 3.80%
Securities [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Percentage of fainancial assets at amortized cost | 13.50% | 13.40%
Insurance financial assets [member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at fair value through profit or loss | R$ 197,942 | R$ 179,313
Financial Assets | 232,311 | 216,529
Insurance financial assets [member] | Low [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at fair value through profit or loss | 197,940 | 179,311
Financial Assets | 232,309 | 216,527
Insurance financial assets [member] | Medium [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at fair value through profit or loss | 2 | 2
Financial Assets | 2 | 2
Insurance financial assets [member] | High [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at fair value through profit or loss | 0 |
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | 3,027 | 8,247
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] | Low [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | 3,027 | 8,247
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] | Medium [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | 0 |
Insurance financial assets [member] | Interbank deposits and securities purchased under agreements to resell [Member] | High [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | 0 |
Insurance financial assets [member] | Securities [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | 31,342 | 28,969
Insurance financial assets [member] | Securities [Member] | Low [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | 31,342 | R$ 28,969
Insurance financial assets [member] | Securities [Member] | Medium [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | 0 |
Insurance financial assets [member] | Securities [Member] | High [Member] |  |
Disclosure of risk level of financial assets [Line Items] |  |
Financial assets at amortised cost | R$ 0 |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
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