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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, 2019 | Dec. 31, 2018
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | R$ 281,110 | R$ 262,232
Accumulated gain / (loss) reflected in income | (1,070) | (321)
Fair value | 280,040 | 261,911
Investment funds [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 9,277 | 5,253
Accumulated gain / (loss) reflected in income | (1,010) | (927)
Fair value | 8,267 | 4,326
Brazilian government securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 218,548 | 215,956
Accumulated gain / (loss) reflected in income | 1,063 | 1,102
Fair value | 219,611 | 217,058
Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 1,541 | 2,070
Accumulated gain / (loss) reflected in income | (21) | 9
Fair value | 1,520 | 2,079
Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 51,744 | 38,953
Accumulated gain / (loss) reflected in income | (1,102) | (505)
Fair value | 50,642 | 38,448
Argentina [Member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 349 | 1,121
Accumulated gain / (loss) reflected in income | (31) | 8
Fair value | 318 | 1,129
Chile [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 487 | 301
Accumulated gain / (loss) reflected in income | 1 | 1
Fair value | 488 | 302
Colombia [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 399 | 207
Accumulated gain / (loss) reflected in income | 10 |
Fair value | 409 | 207
United States [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 141 | 117
Fair value | 141 | 117
Mexico [Member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 57 | 120
Fair value | 57 | 120
Paraguay [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 2 | 1
Fair value | 2 | 1
Peru [Member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 8 |
Fair value | 8 |
Uruguay [member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 98 | 84
Accumulated gain / (loss) reflected in income | (1) |
Fair value | 97 | 84
ITALY | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost |  | 115
Fair value |  | 115
Other [Member] | Government securities - abroad [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost |  | 4
Fair value |  | 4
Negotiable shares [member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 15,459 | 9,778
Accumulated gain / (loss) reflected in income | (822) | (332)
Fair value | 14,637 | 9,446
Bank deposit certificates [member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 792 | 969
Fair value | 792 | 969
Real estate receivables certificates [member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 1,414 | 1,391
Accumulated gain / (loss) reflected in income | 30 | 20
Fair value | 1,444 | 1,411
Debentures [member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 12,958 | 5,147
Accumulated gain / (loss) reflected in income | (303) | (187)
Fair value | 12,655 | 4,960
Eurobonds and others [member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 2,178 | 1,403
Accumulated gain / (loss) reflected in income | (5) | (7)
Fair value | 2,173 | 1,396
Financial bills [Member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 18,517 | 19,724
Accumulated gain / (loss) reflected in income | (3) |
Fair value | 18,514 | 19,724
Promissory notes [Member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 313 | 435
Fair value | 313 | 435
Other [member] | Corporate debt securities [member] |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |
Cost | 113 | 106
Accumulated gain / (loss) reflected in income | 1 | 1
Fair value | R$ 114 | R$ 107

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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/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -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-2017-en-b&anchor=para_8_a&doctype=Standard&book=b -URIDate 2019-03-27 + 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 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_20_a_i&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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