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Financial assets at fair value through profit or loss and designated at fair value through profit or loss - Securities (Details 1) - BRL (R$) R$ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Financial Assets At Carrying Value [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | R$ 135,385 | R$ 129,409
Cost and fair value of financial assets held for trading by maturity, non-current | 436,455 | 385,370
Total | 571,840 | 514,779
Financial Assets At Carrying Value [Member] | Nonstated Maturity [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 48,007 | 44,899
Financial Assets At Carrying Value [Member] | Not later than one year [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 87,378 | 84,510
Financial Assets At Carrying Value [Member] | Later than one year and not later than five years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 337,427 | 289,917
Financial Assets At Carrying Value [Member] | Later than five years and not later than ten years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 64,355 | 62,474
Financial Assets At Carrying Value [Member] | Later than ten years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 34,673 | 32,979
Financial assets at fair value, class [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 133,168 | 127,597
Cost and fair value of financial assets held for trading by maturity, non-current | 426,657 | 384,155
Total | 559,825 | 511,752
Financial assets at fair value, class [member] | Nonstated Maturity [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 45,488 | 43,119
Financial assets at fair value, class [member] | Not later than one year [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 87,680 | 84,478
Financial assets at fair value, class [member] | Later than one year and not later than five years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 332,301 | 289,490
Financial assets at fair value, class [member] | Later than five years and not later than ten years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 62,410 | 62,451
Financial assets at fair value, class [member] | Later than ten years [member] |  |
IfrsStatementLineItems [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | R$ 31,946 | R$ 32,214

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- Definition The amount of current financial assets measured at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of non-current financial assets that are measured at fair value through profit or loss and that are classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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