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Hedge Accounting - Schedule of Breakdown by Maturity of Hedging Strategies (Detail) - BRL (R$) | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | R$ 126,549,000,000 | R$ 171,439,000,000
Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 29,727,000,000 | 62,667,000,000
Hedge of highly probable forecast transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 71,000,000 | 232,000,000
Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 8,003,000,000 | 23,919,000,000
Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 38,013,000,000 | 31,855,000,000
Hedge of assets denominated in UF [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 13,221,000,000 | 15,227,000,000
Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 5,401,000,000 | 482,000,000
Hedges of net investment in foreign operations [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 12,550,000,000 | 10,561,000,000
Fair value hedge [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 21,591,000,000 | 19,410,000,000
Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 9,124,000,000 | 12,157,000,000
Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 7,066,000,000 | 5,977,000,000
Fair value hedge [Member] | Hedge of syndicated loan [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 794,000,000
Cash flow hedges [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 92,408,000,000 | 141,468,000,000
Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,105,000,000 | 6,444,000,000
Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 268,000,000 | 1,124,000,000
Up to one year [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 79,056,000,000 | 76,630,000,000
Up to one year [Member] | Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 11,925,000,000 | 31,471,000,000
Up to one year [Member] | Hedge of highly probable forecast transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 71,000,000 | 162,000,000
Up to one year [Member] | Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 6,346,000,000 | 16,726,000,000
Up to one year [Member] | Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 26,943,000,000 | 251,000,000
Up to one year [Member] | Hedge of assets denominated in UF [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 12,241,000,000 | 12,352,000,000
Up to one year [Member] | Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 4,223,000,000 |
Up to one year [Member] | Hedges of net investment in foreign operations [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 12,550,000,000 | 10,561,000,000
Up to one year [Member] | Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,590,000,000 | 2,399,000,000
Up to one year [Member] | Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 293,000,000 | 268,000,000
Up to one year [Member] | Fair value hedge [Member] | Hedge of syndicated loan [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 794,000,000
Up to one year [Member] | Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 2,874,000,000 | 1,646,000,000
Later than one year and not later than two years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 13,232,000,000 | 49,807,000,000
Later than one year and not later than two years [member] | Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 4,729,000,000 | 11,205,000,000
Later than one year and not later than two years [member] | Hedge of highly probable forecast transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 70,000,000
Later than one year and not later than two years [member] | Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 5,940,000,000
Later than one year and not later than two years [member] | Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 5,838,000,000 | 25,209,000,000
Later than one year and not later than two years [member] | Hedge of assets denominated in UF [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 924,000,000 | 2,822,000,000
Later than one year and not later than two years [member] | Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 297,000,000 | 3,669,000,000
Later than one year and not later than two years [member] | Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,416,000,000 | 143,000,000
Later than one year and not later than two years [member] | Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 749,000,000
Later than one year and not later than two years [member] | Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 28,000,000 |
Later than two years and not later than three years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 8,858,000,000 | 12,869,000,000
Later than two years and not later than three years [member] | Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,519,000,000 | 6,210,000,000
Later than two years and not later than three years [member] | Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,657,000,000 |
Later than two years and not later than three years [member] | Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,517,000,000 | 3,956,000,000
Later than two years and not later than three years [member] | Hedge of assets denominated in UF [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 56,000,000 |
Later than two years and not later than three years [member] | Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 223,000,000
Later than two years and not later than three years [member] | Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 154,000,000 | 799,000,000
Later than two years and not later than three years [member] | Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,793,000,000 | 628,000,000
Later than two years and not later than three years [member] | Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 1,026,000,000
Later than two years and not later than three years [member] | Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 162,000,000 | 27,000,000
Later than three years and not later than four years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,848,000,000 | 17,541,000,000
Later than three years and not later than four years [member] | Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 12,125,000,000
Later than three years and not later than four years [member] | Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 1,253,000,000
Later than three years and not later than four years [member] | Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 1,349,000,000
Later than three years and not later than four years [member] | Hedge of assets denominated in UF [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 53,000,000
Later than three years and not later than four years [member] | Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 391,000,000 | 218,000,000
Later than three years and not later than four years [member] | Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,379,000,000 | 1,502,000,000
Later than three years and not later than four years [member] | Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 884,000,000
Later than three years and not later than four years [member] | Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 78,000,000 | 157,000,000
Later than four years and not later than five years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 10,204,000,000 | 2,283,000,000
Later than four years and not later than five years [member] | Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 5,737,000,000 |
Later than four years and not later than five years [member] | Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,715,000,000 |
Later than four years and not later than five years [member] | Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 377,000,000 | 348,000,000
Later than four years and not later than five years [member] | Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 375,000,000 | 1,335,000,000
Later than four years and not later than five years [member] | Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 525,000,000
Later than four years and not later than five years [member] | Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 75,000,000
From five to ten years [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 10,020,000,000 | 8,225,000,000
From five to ten years [Member] | Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,817,000,000 | 1,656,000,000
From five to ten years [Member] | Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 1,090,000,000
From five to ten years [Member] | Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,178,000,000 | 259,000,000
From five to ten years [Member] | Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,972,000,000 | 2,099,000,000
From five to ten years [Member] | Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 822,000,000 | 642,000,000
From five to ten years [Member] | Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 231,000,000 | 1,614,000,000
From five to ten years [Member] | Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value |  | 865,000,000
After ten years [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,331,000,000 | 4,084,000,000
After ten years [Member] | Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 2,343,000,000 | 2,625,000,000
After ten years [Member] | Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | R$ 988,000,000 | R$ 1,459,000,000

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