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Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets at Fair Value Through Profit or Loss (Detail) - Held-for-trading financial assets [Member] - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | R$ 262,232 | R$ 249,286
Accumulated gain / (loss) reflected in income | (321) | (339)
Fair value | 261,911 | 248,947
Investment funds [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 5,253 | 4,135
Accumulated gain / (loss) reflected in income | (927) | (622)
Fair value | 4,326 | 3,513
Brazilian government securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 215,956 | 207,418
Accumulated gain / (loss) reflected in income | 1,102 | 426
Fair value | 217,058 | 207,844
Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 2,070 | 3,917
Accumulated gain / (loss) reflected in income | 9 | 32
Fair value | 2,079 | 3,949
Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 38,953 | 33,816
Accumulated gain / (loss) reflected in income | (505) | (175)
Fair value | 38,448 | 33,641
Argentina [Member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 1,121 | 1,446
Accumulated gain / (loss) reflected in income | 8 | 20
Fair value | 1,129 | 1,466
Chile [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 301 | 57
Accumulated gain / (loss) reflected in income | 1 |
Fair value | 302 | 57
Colombia [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 207 | 2,080
Accumulated gain / (loss) reflected in income |  | 12
Fair value | 207 | 2,092
United States [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 117 | 100
Fair value | 117 | 100
Mexico [Member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 120 | 5
Fair value | 120 | 5
Paraguay [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 1 | 3
Fair value | 1 | 3
Uruguay [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 84 | 193
Fair value | 84 | 193
ITALY | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 115 |
Fair value | 115 |
Other [Member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 4 | 33
Fair value | 4 | 33
Shares [member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 9,778 | 6,080
Accumulated gain / (loss) reflected in income | (332) | (121)
Fair value | 9,446 | 5,959
Bank deposit certificates [member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 969 | 335
Fair value | 969 | 335
Securitized real estate loans [Member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 1,391 | 1,779
Accumulated gain / (loss) reflected in income | 20 | 16
Fair value | 1,411 | 1,795
Debentures [member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 5,147 | 3,290
Accumulated gain / (loss) reflected in income | (187) | (74)
Fair value | 4,960 | 3,216
Eurobonds and others [member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 1,403 | 684
Accumulated gain / (loss) reflected in income | (7) | 4
Fair value | 1,396 | 688
Financial bills [Member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 19,724 | 21,170
Fair value | 19,724 | 21,170
Promissory notes [Member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 435 | 391
Fair value | 435 | 391
Other [member] | Corporate securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Gross carrying amount | 106 | 87
Accumulated gain / (loss) reflected in income | 1 |
Fair value | R$ 107 | R$ 87

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- Definition The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) on financial assets at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading; Gains (losses) on financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_20_a_i&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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