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Financial Assets Held for Trading and Designated at Fair Value Through Profit or Loss - Summary of Cost and Fair Value of Financial Assets Held for Trading by Maturity (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Gross carrying amount [member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | R$ 78,151 | R$ 152,413
Cost and fair value of financial assets held for trading by maturity, non-current | 287,435 | 233,586
Total | 365,586 | 385,999
Gross carrying amount [member] | Non-stated maturity [Member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 33,781 | 35,470
Gross carrying amount [member] | Up to one year [member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 44,370 | 116,943
Gross carrying amount [member] | From one to five years [member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 212,424 | 175,530
Gross carrying amount [member] | From five to ten years [Member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 51,434 | 37,783
Gross carrying amount [member] | After ten years [Member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 23,577 | 20,273
Fair value [Member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 77,057 | 150,298
Cost and fair value of financial assets held for trading by maturity, non-current | 284,866 | 235,033
Total | 361,923 | 385,331
Fair value [Member] | Non-stated maturity [Member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 32,853 | 33,251
Fair value [Member] | Up to one year [member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, current | 44,204 | 117,047
Fair value [Member] | From one to five years [member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 211,325 | 176,651
Fair value [Member] | From five to ten years [Member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | 50,688 | 37,600
Fair value [Member] | After ten years [Member] |  |
Disclosure of maturity analysis for derivative financial assets [Line Items] |  |
Cost and fair value of financial assets held for trading by maturity, non-current | R$ 22,853 | R$ 20,782

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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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_a&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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- Definition The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_a&doctype=Standard&book=b -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_a&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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