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Securities Sold Under Repurchase Agreements and Interbank and Institutional Market Debts - Summary of Interbank Market Debt (Detail) - BRL (R$) R$ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 134,670 | R$ 124,587 | R$ 129,648
Financial credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 37,928 | 27,691 |
Financial credit bills [member] | Bottom of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 0.00% |  |
Financial credit bills [member] | Top of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 110.00% |  |
Real estate credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 9,546 | 18,525 |
Real estate credit bills [member] | Bottom of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 82.00% |  |
Real estate credit bills [member] | Top of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 95.00% |  |
Agribusiness credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 18,013 | 15,101 |
Agribusiness credit bills [member] | Bottom of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 70.00% |  |
Agribusiness credit bills [member] | Top of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 98.00% |  |
Guaranteed real state notes [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 96.00% |  |
Interbank market debt | R$ 1,227 |  |
Import and export financing [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 50,050 | 39,089 |
Import and export financing [member] | Bottom of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 0.79% |  |
Import and export financing [member] | Top of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 11.10% |  |
On-lending - domestic [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 17,906 | 24,181 |
On-lending - domestic [member] | Bottom of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 2.50% |  |
On-lending - domestic [member] | Top of range [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Percentage of interest on interbank market debt | 14.50% |  |
Current [Member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 73,176 | 73,381 |
Current [Member] | Financial credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 9,139 | 13,234 |
Current [Member] | Real estate credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 6,465 | 14,046 |
Current [Member] | Agribusiness credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 9,586 | 7,562 |
Current [Member] | Import and export financing [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 42,685 | 30,548 |
Current [Member] | On-lending - domestic [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 5,301 | 7,991 |
Non-current [Member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 61,494 | 51,206 |
Non-current [Member] | Financial credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 28,789 | 14,457 |
Non-current [Member] | Real estate credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 3,081 | 4,479 |
Non-current [Member] | Agribusiness credit bills [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 8,427 | 7,539 |
Non-current [Member] | Guaranteed real state notes [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 1,227 |  |
Non-current [Member] | Import and export financing [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | 7,365 | 8,541 |
Non-current [Member] | On-lending - domestic [member] |  |  |
Disclosure Of Repurchase Agreements [Line Items] |  |  |
Interbank market debt | R$ 12,605 | R$ 16,190 |

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