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Hedge Accounting - Schedule of Breakdown by Maturity of Hedging Strategies (Detail) - BRL (R$) | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | R$ 116,430,000,000 | R$ 126,549,000,000
Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 24,543,000,000 | 29,727,000,000
Hedge of highly probable forecast transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 294,000,000 | 71,000,000
Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 5,656,000,000 | 8,003,000,000
Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 32,130,000,000 | 38,013,000,000
Hedge of assets denominated in UF [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 12,582,000,000 | 13,221,000,000
Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 4,609,000,000 | 5,401,000,000
Hedges of net investment in foreign operations [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 16,947,000,000 | 12,550,000,000
Fair value hedge [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 19,431,000,000 | 21,591,000,000
Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 7,436,000,000 | 9,124,000,000
Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 7,386,000,000 | 7,066,000,000
Cash flow hedges [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 80,052,000,000 | 92,408,000,000
Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 4,590,000,000 | 3,105,000,000
Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 257,000,000 | 268,000,000
Up to one year [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 46,126,000,000 | 79,056,000,000
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 | 5,533,000,000 | 11,925,000,000
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 | 294,000,000 | 71,000,000
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
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 | 6,225,000,000 | 26,943,000,000
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 | 9,628,000,000 | 12,241,000,000
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 | 4,230,000,000 | 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 | 16,947,000,000 | 12,550,000,000
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 | 299,000,000 | 1,590,000,000
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 | 381,000,000 | 293,000,000
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 | 2,562,000,000 | 2,874,000,000
Up to one year [member] | Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 27,000,000 |
Later than one year and not later than two years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 32,571,000,000 | 13,232,000,000
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 | 4,409,000,000 | 4,729,000,000
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 | 3,671,000,000 |
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 | 18,739,000,000 | 5,838,000,000
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 | 2,954,000,000 | 924,000,000
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 | 152,000,000 | 297,000,000
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 | 2,490,000,000 | 1,416,000,000
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 | 156,000,000 | 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 | 6,149,000,000 | 8,858,000,000
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 | 1,627,000,000 | 3,519,000,000
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 | 1,985,000,000 | 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 | 812,000,000 | 1,517,000,000
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 | 28,000,000 |
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 | 375,000,000 | 154,000,000
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 | 1,248,000,000 | 1,793,000,000
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 | 74,000,000 | 162,000,000
Later than three years and not later than four years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 17,147,000,000 | 1,848,000,000
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 | 8,464,000,000 |
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 | 5,621,000,000 |
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 | 423,000,000 | 391,000,000
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 | 993,000,000 | 1,379,000,000
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 | 1,646,000,000 |
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
Later than four years and not later than five years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 913,000,000 | 10,204,000,000
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 | 129,000,000 | 377,000,000
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 | 623,000,000 | 375,000,000
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 | 161,000,000 |
From five to ten years [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 11,146,000,000 | 10,020,000,000
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 | 4,510,000,000 | 3,817,000,000
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 | 733,000,000 |
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 | 351,000,000 | 1,178,000,000
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 | 4,220,000,000 | 3,972,000,000
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 | 1,111,000,000 | 822,000,000
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 | 221,000,000 | 231,000,000
After ten years [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 2,378,000,000 | 3,331,000,000
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 | 1,838,000,000 | 2,343,000,000
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$ 540,000,000 | R$ 988,000,000

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