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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
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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$ 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

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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/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 + 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/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 + 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/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 + Details
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