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Hedge accounting (Details 6) - BRL (R$) | Dec. 31, 2022 | Dec. 31, 2021
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IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | R$ 273,280,000,000 | R$ 148,125,000,000
Financial instruments designated as hedging instruments, at fair value | 2,407,000,000 | 2,756,000,000
Fair value hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 37,951,000,000 | 22,826,000,000
Fair value hedges [member] | Hedge fund investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 14,603,000,000 | 11,051,000,000
Financial instruments designated as hedging instruments, at fair value | (762,000,000) | (388,000,000)
Financial Instrument Carrying Value Of Hedged Items | 14,603,000,000 | 11,051,000,000
Cash flow hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 225,396,000,000 | 111,412,000,000
Cash flow hedges [member] | Hedge fund investments [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 7,326,000,000 | 5,779,000,000
Financial instruments designated as hedging instruments, at fair value | 391,000,000 | 137,000,000
Financial Instrument Carrying Value Of Hedged Items | 7,241,000,000 | 5,749,000,000
Hedge Of Deposits And Repurchase Agreements [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 149,210,000,000 | 39,136,000,000
Financial instruments designated as hedging instruments, at fair value | (27,000,000) | (24,000,000)
Financial Instrument Carrying Value Of Hedged Items | 149,300,000,000 | 39,142,000,000
Hedge Of Deposits And Repurchase Agreements [Member] | Cash flow hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 3,288,000,000 | 131,000,000
Financial instruments designated as hedging instruments, at fair value | (11,000,000) |
Financial Instrument Carrying Value Of Hedged Items | 3,283,000,000 | 131,000,000
Hedge Of Highly Probable Forecast Transactions [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 343,000,000 | 3,508,000,000
Financial instruments designated as hedging instruments, at fair value | 1,000,000 | 252,000,000
Financial Instrument Carrying Value Of Hedged Items | 343,000,000 | 3,508,000,000
Hedges of net investment in foreign operations [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 9,933,000,000 | 15,924,000,000
Financial instruments designated as hedging instruments, at fair value | 2,591,000,000 | 3,313,000,000
Financial Instrument Carrying Value Of Hedged Items | 8,983,000,000 | 11,325,000,000
Hedge Of Loan Operations [Member] | Fair value hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 16,031,000,000 | 8,890,000,000
Financial instruments designated as hedging instruments, at fair value | 820,000,000 | (28,000,000)
Financial Instrument Carrying Value Of Hedged Items | 16,031,000,000 | 8,890,000,000
Hedge Of Loan Operations [Member] | Cash flow hedges [member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 3,288,000,000 | 131,000,000
Hedge Of Assets Transactions [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 6,528,000,000 | 8,213,000,000
Financial instruments designated as hedging instruments, at fair value | 1,000,000 | 8,000,000
Financial Instrument Carrying Value Of Hedged Items | 6,894,000,000 | 8,621,000,000
Hedge Of Asset Backed Securities Under Repurchase Agreements [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 50,848,000,000 | 39,962,000,000
Financial instruments designated as hedging instruments, at fair value | 30,000,000 | 50,000,000
Financial Instrument Carrying Value Of Hedged Items | 52,916,000,000 | 40,526,000,000
Hedge Of Assets Denominated In U F [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 7,853,000,000 | 14,683,000,000
Financial instruments designated as hedging instruments, at fair value | (646,000,000) | (593,000,000)
Financial Instrument Carrying Value Of Hedged Items | 7,871,000,000 | 14,558,000,000
Hedge Of Securities [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Hedge instruments, Nominal Value | 7,317,000,000 | 2,885,000,000
Financial instruments designated as hedging instruments, at fair value | 19,000,000 | 29,000,000
Financial Instrument Carrying Value Of Hedged Items | R$ 7,363,000,000 | R$ 3,162,000,000

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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 22 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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