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Risk and Capital Management - Credit Risk Exposure (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
Financial Assets | R$ 1,410,233 | R$ 1,330,728
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 operations and lease operations | 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 - provision for expected loss | 4,140 | 3,792
Loan Commitments | 3,303 | 2,601
Financial Guarantees | 837 | 1,191
Off balance sheet | 387,155 | 349,695
Credit risk exposure | 1,793,248 | 1,676,631
Financial Guarantees Provided [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 66,720 | 66,105
Letters Of Credit To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 15,013 | 10,747
Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 305,422 | 272,843
Mortgage loans [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 5,536 | 3,403
Overdraft Accounts [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 124,449 | 110,454
Credit Cards [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 140,837 | 123,823
Other Pre Approved Limits [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 34,600 | 35,163
Brazil [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Financial Assets | 1,073,430 | 1,027,193
At Amortized Cost | 755,773 | 756,993
Interbank deposits | 10,620 | 6,239
Securities purchased under agreements to resell | 197,157 | 279,353
Securities | 114,046 | 90,234
Loan operations and lease operations | 386,206 | 345,501
Other financial assets | 75,968 | 61,875
(-) Provision for Expected Loss | (28,224) | (26,209)
At Fair Value Through Other Comprehensive Income | 35,990 | 9,089
Securities | 35,990 | 9,089
At Fair Value Through Profit or Loss | 281,667 | 261,111
Securities | 271,470 | 252,819
Derivatives | 10,197 | 8,292
Financial liabilities - provision for expected loss | 3,581 | 3,355
Loan Commitments | 2,909 | 2,289
Financial Guarantees | 672 | 1,066
Off balance sheet | 338,262 | 300,522
Credit risk exposure | 1,408,111 | 1,324,360
Brazil [Member] | Financial Guarantees Provided [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 52,663 | 53,443
Brazil [Member] | Letters Of Credit To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 15,013 | 10,747
Brazil [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 270,586 | 236,332
Brazil [Member] | Mortgage loans [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 5,536 | 3,403
Brazil [Member] | Overdraft Accounts [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 124,449 | 110,454
Brazil [Member] | Credit Cards [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 138,014 | 120,862
Brazil [Member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 2,587 | 1,613
Foreign [member] |  |
Disclosure of credit risk exposure [line items] |  |
Financial Assets | 336,803 | 303,535
At Amortized Cost | 254,871 | 237,766
Interbank deposits | 23,963 | 20,181
Securities purchased under agreements to resell | 1,271 | 783
Securities | 19,073 | 20,161
Loan operations and lease operations | 199,585 | 190,590
Other financial assets | 18,784 | 13,215
(-) Provision for Expected Loss | (7,805) | (7,164)
At Fair Value Through Other Comprehensive Income | 40,670 | 40,234
Securities | 40,670 | 40,234
At Fair Value Through Profit or Loss | 41,262 | 25,535
Securities | 9,605 | 10,361
Derivatives | 31,657 | 15,174
Financial liabilities - provision for expected loss | 559 | 437
Loan Commitments | 394 | 312
Financial Guarantees | 165 | 125
Off balance sheet | 48,893 | 49,173
Credit risk exposure | 385,137 | 352,271
Foreign [member] | Financial Guarantees Provided [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 14,057 | 12,662
Foreign [member] | Letters Of Credit To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 0 |
Foreign [member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 34,836 | 36,511
Foreign [member] | Mortgage loans [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 0 |
Foreign [member] | Overdraft Accounts [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 0 |
Foreign [member] | Credit Cards [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | 2,823 | 2,961
Foreign [member] | Other Pre Approved Limits [Member] | Commitments To Be Released [Member] |  |
Disclosure of credit risk exposure [line items] |  |
Off balance sheet | R$ 32,013 | R$ 33,550

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