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Hedge Accounting - Schedule of Each Strategy of Nominal Value and Fair Value Adjustments of Hedge Instruments and Book Value of Hedged Item (Detail) - BRL (R$) | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | R$ 126,549,000,000 | R$ 171,439,000,000
Hedge instruments, fair value adjustments | 2,378,000,000 | 1,215,000,000
Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 29,727,000,000 | 62,667,000,000
Hedge instruments, fair value adjustments | (21,000,000) | (32,000,000)
Hedge instruments, Book Value | 29,727,000,000 | 62,667,000,000
Hedge of highly probable forecast transactions [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 71,000,000 | 232,000,000
Hedge instruments, fair value adjustments | 6,000,000 | 9,000,000
Hedge instruments, Book Value | 71,000,000 | 219,000,000
Hedge of assets transactions [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 8,003,000,000 | 23,919,000,000
Hedge instruments, fair value adjustments | 136,000,000 | 2,000,000
Hedge instruments, Book Value | 7,866,000,000 | 23,490,000,000
Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 38,013,000,000 | 31,855,000,000
Hedge instruments, fair value adjustments | 8,000,000 | 11,000,000
Hedge instruments, Book Value | 36,668,000,000 | 31,099,000,000
Hedge of assets denominated in UF [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 13,221,000,000 | 15,227,000,000
Hedge instruments, fair value adjustments | 23,000,000 | (28,000,000)
Hedge instruments, Book Value | 13,247,000,000 | 15,227,000,000
Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 5,401,000,000 | 482,000,000
Hedge instruments, fair value adjustments | (82,000,000) | 34,000,000
Hedge instruments, Book Value | 5,391,000,000 | 482,000,000
Hedges of net investment in foreign operations [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 12,550,000,000 | 10,561,000,000
Hedge instruments, fair value adjustments | 2,230,000,000 | 1,283,000,000
Hedge instruments, Book Value | 14,820,000,000 | 13,074,000,000
Fair value hedge [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 21,591,000,000 | 19,410,000,000
Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 9,124,000,000 | 12,157,000,000
Hedge instruments, fair value adjustments | 43,000,000 | (114,000,000)
Hedge instruments, Book Value | 9,124,000,000 | 12,157,000,000
Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 7,066,000,000 | 5,977,000,000
Hedge instruments, fair value adjustments | (54,000,000) | 52,000,000
Hedge instruments, Book Value | 7,066,000,000 | 5,977,000,000
Fair value hedge [Member] | Hedge of syndicated loan [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value |  | 794,000,000
Hedge instruments, Book Value |  | 794,000,000
Cash flow hedges [member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 92,408,000,000 | 141,468,000,000
Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 3,105,000,000 | 6,444,000,000
Hedge instruments, fair value adjustments | 82,000,000 | (16,000,000)
Hedge instruments, Book Value | 3,200,000,000 | 6,444,000,000
Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of detailed information about hedged items [line items] |  |
Hedge instruments, Nominal Value | 268,000,000 | 1,124,000,000
Hedge instruments, fair value adjustments | 7,000,000 | 14,000,000
Hedge instruments, Book Value | R$ 274,000,000 | R$ 1,124,000,000

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