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Hedge Accounting - Schedule of Breakdown by Maturity of Hedging Strategies (Detail) - BRL (R$) | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | R$ 148,461,000,000 | R$ 215,277,000,000
Hedge of deposits and repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 39,136,000,000 | 103,407,000,000
Hedge of highly probable forecast transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,508,000,000 | 1,314,000,000
Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 8,213,000,000 | 5,743,000,000
Hedge of asset backed securities under repurchase agreements [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 39,962,000,000 | 31,417,000,000
Hedge of assets denominated in UF [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 14,683,000,000 | 16,677,000,000
Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 3,220,000,000 | 10,383,000,000
Hedges of net investment in foreign operations [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 13,888,000,000 | 24,619,000,000
Fair value hedge [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 23,161,000,000 | 29,788,000,000
Fair value hedge [Member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 11,051,000,000 | 10,200,000,000
Fair value hedge [Member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 8,890,000,000 | 9,205,000,000
Cash flow hedges [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 111,412,000,000 | 160,870,000,000
Cash flow hedges [member] | Hedge of funding [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 5,779,000,000 | 1,996,000,000
Cash flow hedges [member] | Hedge of loan operations [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 131,000,000 | 316,000,000
Up to one year [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 40,209,000,000 | 148,388,000,000
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 | 1,284,000,000 | 70,200,000,000
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 | 3,508,000,000 | 1,314,000,000
Up to one year [member] | Hedge of assets transactions [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 2,198,000,000 | 3,604,000,000
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 | 2,322,000,000 | 22,186,000,000
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 | 10,148,000,000 | 15,400,000,000
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 | 0 | 5,876,000,000
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 | 13,888,000,000 | 24,619,000,000
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 | 1,206,000,000 | 213,000,000
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 | 3,377,000,000 | 2,999,000,000
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 | 2,147,000,000 | 1,765,000,000
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 | 131,000,000 | 212,000,000
Later than one year and not later than two years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 35,630,000,000 | 18,753,000,000
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 | 9,453,000,000 | 9,077,000,000
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 | 0 | 2,139,000,000
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 | 14,963,000,000 | 2,297,000,000
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 | 4,535,000,000 | 1,277,000,000
Later than one year and not later than two years [member] | Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 453,000,000 | 1,382,000,000
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 | 1,072,000,000 | 657,000,000
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 | 1,522,000,000 | 1,793,000,000
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 | 3,632,000,000 | 27,000,000
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 | 0 | 104,000,000
Later than two years and not later than three years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 30,367,000,000 | 21,249,000,000
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 | 14,221,000,000 | 13,059,000,000
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 | 6,015,000,000 | 0
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 | 8,976,000,000 | 6,130,000,000
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 | 0 | 0
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 | 56,000,000 | 10,000,000
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 | 302,000,000 | 549,000,000
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 | 797,000,000 | 1,297,000,000
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 | 0 | 204,000,000
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 | 0 | 0
Later than three years and not later than four years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 23,214,000,000 | 6,127,000,000
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 | 7,313,000,000 | 5,504,000,000
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 | 13,098,000,000 |
Later than three years and not later than four years [member] | Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,692,000,000 |
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 | 273,000,000 | 176,000,000
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 | 838,000,000 | 447,000,000
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 | 0 | 0
Later than four years and not later than five years [member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 9,087,000,000 | 7,850,000,000
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 | 5,332,000,000 | 4,848,000,000
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 | 0 | 804,000,000
Later than four years and not later than five years [member] | Hedge of fair value through other comprehensive income [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 26,000,000 | 719,000,000
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 | 2,920,000,000 | 581,000,000
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 | 809,000,000 | 898,000,000
From five to ten years [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 8,592,000,000 | 10,334,000,000
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 | 1,533,000,000 | 719,000,000
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 | 603,000,000 |
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 | 993,000,000 | 2,396,000,000
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 | 3,916,000,000 | 5,448,000,000
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 | 1,547,000,000 | 1,771,000,000
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 | 0 | 0
After ten years [Member] |  |
Disclosure of risk management strategy related to hedge accounting [line items] |  |
Nominal Value | 1,362,000,000 | 2,576,000,000
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 | 1,362,000,000 | 2,576,000,000
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$ 0 | R$ 0

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