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Risk and Capital Management - Credit Risk Exposure (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure of credit risk exposure [line items] |  |  |
Financial Assets | R$ 1,330,728 | R$ 1,231,414 |
At Amortized Cost | 994,759 | 905,729 | R$ 902,289
Interbank deposits | 26,420 | 29,048 | 22,688
Securities purchased under agreements to resell | 280,136 | 244,707 | 265,050
Securities | 110,395 | 111,424 |
Loan operations and lease operations | 536,091 | 497,719 | 494,851
Other financial assets | 75,090 | 59,568 | 53,895
(-) Provision for Expected Loss | (33,373) | (36,737) |
At Fair Value Through Other Comprehensive Income | 49,323 | 52,149 | 40,039
Securities | 49,323 | 52,149 |
At Fair Value Through Profit or Loss | 286,646 | 273,536 |
Securities | 263,180 | 250,693 |
Derivatives | 23,466 | 22,843 |
Financial liabilities - provision for expected loss | 3,792 | 4,922 |
Loan Commitments | 2,601 | 3,015 | R$ 2,761
Financial Guarantees | 1,191 | 1,907 |
Off balance sheet | 349,695 | 323,829 |
Credit risk exposure | 1,676,631 | 1,550,321 |
Financial Guarantees Provided [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 66,105 | 70,489 |
Letters Of Credit To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 10,747 | 9,214 |
Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 272,843 | 244,126 |
Mortgage loans [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 3,403 | 3,218 |
Overdraft Accounts [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 110,454 | 93,284 |
Credit Cards [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 123,823 | 111,875 |
Other Pre Approved Limits [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 35,163 | 35,749 |
Brazil [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Financial Assets | 1,027,193 | 967,703 |
At Amortized Cost | 756,993 | 702,672 |
Interbank deposits | 6,239 | 6,367 |
Securities purchased under agreements to resell | 279,353 | 243,917 |
Securities | 90,234 | 101,365 |
Loan operations and lease operations | 345,501 | 327,501 |
Other financial assets | 61,875 | 53,787 |
(-) Provision for Expected Loss | (26,209) | (30,265) |
At Fair Value Through Other Comprehensive Income | 9,089 | 14,722 |
Securities | 9,089 | 14,722 |
At Fair Value Through Profit or Loss | 261,111 | 250,309 |
Securities | 252,819 | 238,200 |
Derivatives | 8,292 | 12,109 |
Financial liabilities - provision for expected loss | 3,355 | 4,513 |
Loan Commitments | 2,289 | 2,681 |
Financial Guarantees | 1,066 | 1,832 |
Off balance sheet | 300,522 | 280,032 |
Credit risk exposure | 1,324,360 | 1,243,222 |
Brazil [Member] | Financial Guarantees Provided [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 53,443 | 60,062 |
Brazil [Member] | Letters Of Credit To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 10,747 | 9,214 |
Brazil [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 236,332 | 210,756 |
Brazil [Member] | Mortgage loans [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 3,403 | 3,218 |
Brazil [Member] | Overdraft Accounts [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 110,454 | 93,284 |
Brazil [Member] | Credit Cards [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 120,862 | 109,196 |
Brazil [Member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 1,613 | 5,058 |
Foreign [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Financial Assets | 303,535 | 263,711 |
At Amortized Cost | 237,766 | 203,057 |
Interbank deposits | 20,181 | 22,681 |
Securities purchased under agreements to resell | 783 | 790 |
Securities | 20,161 | 10,059 |
Loan operations and lease operations | 190,590 | 170,218 |
Other financial assets | 13,215 | 5,781 |
(-) Provision for Expected Loss | (7,164) | (6,472) |
At Fair Value Through Other Comprehensive Income | 40,234 | 37,427 |
Securities | 40,234 | 37,427 |
At Fair Value Through Profit or Loss | 25,535 | 23,227 |
Securities | 10,361 | 12,493 |
Derivatives | 15,174 | 10,734 |
Financial liabilities - provision for expected loss | 437 | 409 |
Loan Commitments | 312 | 334 |
Financial Guarantees | 125 | 75 |
Off balance sheet | 49,173 | 43,797 |
Credit risk exposure | 352,271 | 307,099 |
Foreign [member] | Financial Guarantees Provided [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 12,662 | 10,427 |
Foreign [member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 36,511 | 33,370 |
Foreign [member] | Credit Cards [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | 2,961 | 2,679 |
Foreign [member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Off balance sheet | R$ 33,550 | R$ 30,691 |

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