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Risk and Capital Management - Summary of Funding from Clients (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 507,060 | R$ 463,424
Funds from acceptances and issuance of securities | 158,972 | R$ 127,842
Subordinated debt | 36,627 |
Total | R$ 277,000 |
Percentage of funding from clients | 100.00% | 100.00%
ITAU UNIBANCO HOLDING [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 507,060 | R$ 463,424
Demand deposits | 82,306 | 72,581
Savings deposits | 144,558 | 136,865
Time deposits | 277,166 | 251,300
Other | 3,030 | 2,678
Funds from acceptances and issuance of securities | 143,569 | 111,566
Funds from own issue | 5,258 | 21,417
Subordinated debt | 59,462 | 49,313
Total | 715,349 | 645,720
0-30 days [Member] | ITAU UNIBANCO HOLDING [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | 272,447 | 248,913
Demand deposits | 82,306 | 72,581
Savings deposits | 144,558 | 136,865
Time deposits | 44,855 | 37,784
Other | 728 | 1,683
Funds from acceptances and issuance of securities | 4,293 | 2,285
Funds from own issue | 235 | 1,831
Subordinated debt | 2 | 2
Total | 276,977 | 253,031
Demand deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 82,306 | R$ 72,581
Percentage of funding from clients | 11.50% | 11.20%
Savings deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 20.20% | 21.20%
Time deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 277,166 | R$ 251,300
Percentage of funding from clients | 38.80% | 38.90%
Other [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Deposits | R$ 9 | R$ 3
Percentage of funding from clients | 0.40% | 0.40%
Security Deposits [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 20.10% | 17.30%
Issued debt [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 0.70% | 3.30%
Subordinated debt [Member] |  |
Disclosure of Sources of Funding [Line Items] |  |
Percentage of funding from clients | 8.30% | 7.60%

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