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Risk and Capital Management - Summary of Position of Accounts Subject to Interest Rate Risk (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Financial assets | R$ 1,424,876 | R$ 1,330,251 | R$ 1,246,833
Central Bank compulsory deposits | 94,148 | 98,837 |
Interbank deposits | 26,420 | 29,048 | 22,688
Securities purchased under agreements to resell | 280,136 | 244,707 | 265,050
Loan and lease operations | 536,091 | 497,719 | 494,851
Derivatives | 23,466 | 22,843 | 24,231
At Fair Value Through Other Comprehensive Income | 49,323 | 52,149 | 40,039
Financial liabilities | 1,151,237 | 1,056,717 | 1,012,075
Deposits | 463,424 | 402,938 | 329,414
Securities sold under repurchase agreements | 330,237 | 312,634 | 349,164
Interbank market debts | 134,670 | 124,587 | 129,648
Derivatives | 27,519 | 26,746 | 24,698
Structured notes | (192) | (465) | R$ (519)
Financial assets designated at fair value through profit or loss [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Loan and lease operations |  | 102 |
Interest rate risk [Member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Financial assets | 1,285,355 | 1,297,440 |
Central Bank compulsory deposits | 88,549 | 94,047 |
At Fair Value Through Other Comprehensive Income | 49,323 | 52,149 |
Financial liabilities | 1,053,438 | 905,206 |
Interest rate risk [Member] | Financial liabilities at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Deposits | 463,424 | 402,938 |
Securities sold under repurchase agreements | 330,237 | 312,634 |
Interbank market debts | 134,670 | 124,587 |
Institutional market debts | 93,974 | 98,482 |
Capitalization plans | 3,422 | 3,301 |
Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Derivatives | 27,519 | 26,746 |
Structured notes | 192 | 465 |
Difference asset/ liability (2) | 231,917 | 392,234 |
Interest rate risk [Member] | Financial assets at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Interbank deposits | 26,414 | 29,048 |
Securities purchased under agreements to resell | 280,132 | 244,699 |
Securities | 106,749 | 106,242 |
Loan and lease operations | 536,091 | 497,719 |
Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Securities | 263,180 | 248,947 |
Derivatives | 23,466 | 22,843 |
0-30 days [Member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Derivatives | 3,987 | 7,978 |
Derivatives | 3,168 | 7,596 |
0-30 days [Member] | Interest rate risk [Member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Financial assets | 188,616 | 268,059 |
Central Bank compulsory deposits | 88,549 | 94,047 |
At Fair Value Through Other Comprehensive Income | 1,915 | 1,088 |
Financial liabilities | 513,889 | 376,492 |
Cumulative difference | R$ (325,273) | R$ (108,433) |
Ratio of cumulative difference to total interest-bearing assets | (25.30%) | (8.40%) |
0-30 days [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Deposits | R$ 248,913 | R$ 216,842 |
Securities sold under repurchase agreements | 254,052 | 208,261 |
Interbank market debts | 7,438 | 8,557 |
Institutional market debts | 314 | 4,188 |
0-30 days [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Derivatives | 3,168 | 7,596 |
Structured notes | 4 | 11 |
Difference asset/ liability (2) | (325,273) | (108,433) |
0-30 days [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Interbank deposits | 19,181 | 21,644 |
Securities purchased under agreements to resell | 64,677 | 42,612 |
Securities | 1,007 | 10,897 |
Loan and lease operations | 78,709 | 73,239 |
0-30 days [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Securities | 19,140 | 16,554 |
Derivatives | 3,987 | 7,978 |
31-180 days [Member] | Interest rate risk [Member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Financial assets | 394,168 | 354,885 |
At Fair Value Through Other Comprehensive Income | 4,743 | 2,476 |
Financial liabilities | 88,152 | 93,736 |
Cumulative difference | R$ (19,257) | R$ 152,716 |
Ratio of cumulative difference to total interest-bearing assets | (1.50%) | 11.80% |
31-180 days [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Deposits | R$ 36,856 | R$ 33,258 |
Securities sold under repurchase agreements | 9,713 | 7,362 |
Interbank market debts | 33,869 | 34,097 |
Institutional market debts | 3,631 | 16,495 |
31-180 days [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Derivatives | 4,070 | 2,491 |
Structured notes | 13 | 22 |
Difference asset/ liability (2) | 306,016 | 261,149 |
31-180 days [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Interbank deposits | 4,815 | 3,510 |
Securities purchased under agreements to resell | 215,352 | 201,889 |
Securities | 7,320 | 7,921 |
Loan and lease operations | 140,057 | 120,231 |
31-180 days [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Securities | 17,810 | 15,855 |
Derivatives | 4,071 | 3,003 |
181-365 days [Member] | Interest rate risk [Member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Financial assets | 100,598 | 103,785 |
At Fair Value Through Other Comprehensive Income | 4,026 | 6,102 |
Financial liabilities | 69,102 | 87,850 |
Cumulative difference | R$ 12,239 | R$ 168,651 |
Ratio of cumulative difference to total interest-bearing assets | 1.00% | 13.00% |
181-365 days [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Deposits | R$ 22,063 | R$ 23,239 |
Securities sold under repurchase agreements | 7,756 | 25,185 |
Interbank market debts | 31,869 | 30,727 |
Institutional market debts | 4,579 | 5,343 |
181-365 days [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Derivatives | 2,815 | 3,325 |
Structured notes | 20 | 22 |
Difference asset/ liability (2) | 31,496 | 15,935 |
181-365 days [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Interbank deposits | 1,730 | 2,880 |
Securities purchased under agreements to resell |  | 2 |
Securities | 5,792 | 6,834 |
Loan and lease operations | 70,792 | 67,463 |
181-365 days [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Securities | 15,945 | 17,103 |
Derivatives | 2,313 | 2,360 |
From one to five years [Member] | Interest rate risk [Member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Financial assets | 399,075 | 392,119 |
At Fair Value Through Other Comprehensive Income | 21,649 | 23,415 |
Financial liabilities | 313,240 | 290,677 |
Cumulative difference | R$ 98,074 | R$ 270,093 |
Ratio of cumulative difference to total interest-bearing assets | 7.60% | 20.80% |
From one to five years [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Deposits | R$ 146,288 | R$ 126,886 |
Securities sold under repurchase agreements | 40,877 | 57,146 |
Interbank market debts | 58,375 | 47,219 |
Institutional market debts | 58,513 | 43,911 |
Capitalization plans | 3,422 | 3,301 |
From one to five years [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Derivatives | 5,672 | 11,109 |
Structured notes | 93 | 319 |
Difference asset/ liability (2) | 85,835 | 101,442 |
From one to five years [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Interbank deposits | 688 | 1,011 |
Securities purchased under agreements to resell | 12 | 28 |
Securities | 50,969 | 50,650 |
Loan and lease operations | 167,517 | 161,824 |
From one to five years [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Securities | 154,171 | 147,805 |
Derivatives | 4,069 | 6,681 |
Over 5 years [Member] | Interest rate risk [Member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Financial assets | 202,898 | 178,592 |
At Fair Value Through Other Comprehensive Income | 16,990 | 19,068 |
Financial liabilities | 69,055 | 56,451 |
Cumulative difference | R$ 231,917 | R$ 392,234 |
Ratio of cumulative difference to total interest-bearing assets | 18.00% | 30.20% |
Over 5 years [Member] | Interest rate risk [Member] | Financial liabilities at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Deposits | R$ 9,304 | R$ 2,713 |
Securities sold under repurchase agreements | 17,839 | 14,680 |
Interbank market debts | 3,119 | 3,987 |
Institutional market debts | 26,937 | 28,545 |
Over 5 years [Member] | Interest rate risk [Member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Derivatives | 11,794 | 2,225 |
Structured notes | 62 | 91 |
Difference asset/ liability (2) | 133,843 | 122,141 |
Over 5 years [Member] | Interest rate risk [Member] | Financial assets at amortised cost, category [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Interbank deposits |  | 3 |
Securities purchased under agreements to resell | 91 | 168 |
Securities | 41,661 | 29,940 |
Loan and lease operations | 79,016 | 74,962 |
Over 5 years [Member] | Interest rate risk [Member] | Financial assets designated at fair value through profit or loss [member] |  |  |
Disclosure of position of accounts subject to interest rate risk [Line Items] |  |  |
Securities | 56,114 | 51,630 |
Derivatives | R$ 9,026 | R$ 2,821 |

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