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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, 2019	Dec. 31, 2018
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$ 82,183	R$ 53,382
Cost and fair value of financial assets held for trading by maturity, non-current	198,927	208,850
Total	281,110	262,232
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	24,736	15,031
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	57,447	38,351
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	136,727	153,256
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	41,744	44,258
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	20,456	11,336
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	80,372	52,096
Cost and fair value of financial assets held for trading by maturity, non-current	199,668	209,815
Total	280,040	261,911
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	22,904	13,772
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	57,468	38,324
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	137,186	153,701
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	41,759	44,620
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$ 20,723	R$ 11,494

X

- 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
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-IssueDate 2019-01-01
-Paragraph 55
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-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
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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
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
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