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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, 2018	Dec. 31, 2017
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$ 53,382	R$ 50,174
Cost and fair value of financial assets held for trading by maturity, non-current	208,850	199,112
Total	262,232	249,286
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	15,031	10,214
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	38,351	39,960
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	153,256	147,700
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	44,258	41,279
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	11,336	10,133
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	52,096	49,512
Cost and fair value of financial assets held for trading by maturity, non-current	209,815	199,435
Total	261,911	248,947
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	13,772	9,469
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	38,324	40,043
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	153,701	147,805
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	44,620	41,499
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$ 11,494	R$ 10,131

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/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 8
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=B
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

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X

- 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/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
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-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2017-01-01
-Paragraph 55
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X

- 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/2003/role/disclosureRef
-Note Expiry date 2018-01-01
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-IssueDate 2017-01-01
-Paragraph 8
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=B
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2017-03-09

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