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Interbank Deposits and Securities Purchased Under Agreements to Resell - Summary of Interbank Deposits and Securities Purchased Under Agreements to Resell (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items] |  |  |
Securities purchased under agreements to resell | R$ 55,104 | R$ 49,238 | R$ 64,219
Interbank deposits | 3,295 | 15,327 | R$ 13,358
Interbank deposits and securities purchased under agreements to resell [Member] |  |  |
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items] |  |  |
Securities purchased under agreements to resell | 280,132 | 244,699 |
Collateral held | 63,485 | 59,403 |
Collateral repledge | 170,510 | 147,749 |
Assets received as collateral with right to sell or repledge | 28,369 | 55,004 |
Assets received as collateral without right to sell or repledge | 142,141 | 92,745 |
Collateral sold | 46,137 | 37,547 |
Interbank deposits | 26,414 | 29,048 |
Total | 306,546 | 273,747 |
Current [Member] | Interbank deposits and securities purchased under agreements to resell [Member] |  |  |
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items] |  |  |
Securities purchased under agreements to resell | 280,029 | 244,503 |
Collateral held | 63,392 | 59,207 |
Collateral repledge | 170,500 | 147,749 |
Assets received as collateral with right to sell or repledge | 28,369 | 55,004 |
Assets received as collateral without right to sell or repledge | 142,131 | 92,745 |
Collateral sold | 46,137 | 37,547 |
Interbank deposits | 25,726 | 28,034 |
Total | 305,755 | 272,537 |
Non-current [Member] | Interbank deposits and securities purchased under agreements to resell [Member] |  |  |
Disclosure of interbank deposits and securities purchased under agreements to resell [Line Items] |  |  |
Securities purchased under agreements to resell | 103 | 196 |
Collateral held | 93 | 196 |
Collateral repledge | 10 |  |
Assets received as collateral with right to sell or repledge | 0 |  |
Assets received as collateral without right to sell or repledge | 10 |  |
Collateral sold | 0 |  |
Interbank deposits | 688 | 1,014 |
Total | R$ 791 | R$ 1,210 |

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- Definition The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 15 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_15_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Assets Held As Collateral Not Permitted To Be Sold or Repledged at Fair Value + References No definition available. + Details
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- Definition Collateral held under agreement to resell. + References No definition available. + Details
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- Definition Collateral sold under agreement to resell. + References No definition available. + Details
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- Definition Interbank deposits. + References No definition available. + Details
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- Definition Interbank deposits and securities purchased under agreements to resell. + References No definition available. + Details
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