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Fair Value of Financial Instruments - Summary of Carrying and Estimated Fair Values for Financial Instruments (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Cash and cash equivalents | R$ 70,811 | R$ 95,558 | R$ 83,314 | R$ 96,119
Central Bank compulsory deposits | 91,248 | 94,148 |  |
At Amortized Cost | 1,010,644 | 994,759 |  |
Interbank deposits | 34,583 | 26,420 |  |
Securities purchased under agreements to resell | 198,428 | 280,136 |  |
Other financial assets | 94,752 | 75,090 |  |
Provision for Expected Loss | (36,029) | (33,373) |  |
At Fair Value Through Other Comprehensive Income | 76,660 | 49,323 |  |
At Fair Value Through Profit or Loss | 322,929 | 286,646 |  |
Derivatives | 41,854 | 23,466 |  |
At amortized cost | 1,159,830 | 1,119,734 |  |
Deposits | 507,060 | 463,424 |  |
Securities sold under repurchase agreements | 256,583 | 330,237 |  |
Other financial liabilities | 117,081 | 97,429 |  |
At Fair Value Through Profit or Loss | 48,029 | 27,711 |  |
Derivatives | 47,828 | 27,519 |  |
Structured notes | (201) | (192) |  |
Provision for expected loss | 4,140 | 3,792 |  |
Loan Commitments | 3,303 | 2,601 |  |
Financial Guarantees | 837 | 1,191 |  |
Carrying value [Member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Cash and cash equivalents | 30,367 | 37,159 |  |
Financial assets | 1,501,481 | 1,424,876 |  |
Central Bank compulsory deposits | 91,248 | 94,148 |  |
At Amortized Cost | 1,010,644 | 994,759 |  |
Interbank deposits | 34,583 | 26,420 |  |
Securities purchased under agreements to resell | 198,428 | 280,136 |  |
Securities | 133,119 | 110,395 |  |
Loan and Financial Lease | 585,791 | 536,091 |  |
Other financial assets | 94,752 | 75,090 |  |
Provision for Expected Loss | (36,029) | (33,373) |  |
At Fair Value Through Other Comprehensive Income | 76,660 | 49,323 |  |
Securities | 76,660 | 49,323 |  |
At Fair Value Through Profit or Loss | 322,929 | 286,646 |  |
Securities | 281,075 | 263,180 |  |
Derivatives | 41,854 | 23,466 |  |
Financial liabilities | 1,211,999 | 1,151,237 |  |
At amortized cost | 1,159,830 | 1,119,734 |  |
Deposits | 507,060 | 463,424 |  |
Securities sold under repurchase agreements | 256,583 | 330,237 |  |
Interbank market funds | 174,862 | 134,670 |  |
Institutional market funds | 104,244 | 93,974 |  |
Other financial liabilities | 117,081 | 97,429 |  |
At Fair Value Through Profit or Loss | 48,029 | 27,711 |  |
Derivatives | 47,828 | 27,519 |  |
Structured notes | 201 | 192 |  |
Provision for expected loss | 4,140 | 3,792 |  |
Loan Commitments | 3,303 | 2,601 |  |
Financial Guarantees | 837 | 1,191 |  |
Estimated fair value [member] |  |  |  |
Disclosure of fair value measurement of assets and liabilities [Line Items] |  |  |  |
Cash and cash equivalents | 30,367 | 37,159 |  |
Financial assets | 1,513,562 | 1,433,116 |  |
Central Bank compulsory deposits | 91,248 | 94,148 |  |
At Amortized Cost | 1,022,725 | 1,002,999 |  |
Interbank deposits | 34,622 | 26,510 |  |
Securities purchased under agreements to resell | 198,428 | 280,136 |  |
Securities | 135,891 | 112,171 |  |
Loan and Financial Lease | 595,061 | 542,465 |  |
Other financial assets | 94,752 | 75,090 |  |
Provision for Expected Loss | (36,029) | (33,373) |  |
At Fair Value Through Other Comprehensive Income | 76,660 | 49,323 |  |
Securities | 76,660 | 49,323 |  |
At Fair Value Through Profit or Loss | 322,929 | 286,646 |  |
Securities | 281,075 | 263,180 |  |
Derivatives | 41,854 | 23,466 |  |
Financial liabilities | 1,214,196 | 1,150,700 |  |
At amortized cost | 1,162,027 | 1,119,197 |  |
Deposits | 507,110 | 463,363 |  |
Securities sold under repurchase agreements | 256,583 | 330,237 |  |
Interbank market funds | 174,949 | 134,533 |  |
Institutional market funds | 106,304 | 93,635 |  |
Other financial liabilities | 117,081 | 97,429 |  |
At Fair Value Through Profit or Loss | 48,029 | 27,711 |  |
Derivatives | 47,828 | 27,519 |  |
Structured notes | 201 | 192 |  |
Provision for expected loss | 4,140 | 3,792 |  |
Loan Commitments | 3,303 | 2,601 |  |
Financial Guarantees | R$ 837 | R$ 1,191 |  |

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