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Financial Assets Held for Trading and Designated at Fair Value Through Profit or Loss - Summary of Cost and Fair Value by Maturity of Financial Assets Designated as Fair Value Through Profit or Loss (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Current | R$ 1,269 | R$ 1,746
Gross carrying amount [member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Current | 765 | 1,006
Non-current | 467 | 664
Gross carrying amount [member] | Up to one year [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Current | 765 | 1,006
Gross carrying amount [member] | From one to five years [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Non-current | 467 | 664
Fair value [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Current | 799 | 1,041
Non-current | 470 | 705
Fair value [Member] | Up to one year [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Current | 799 | 1,041
Fair value [Member] | From one to five years [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Non-current | R$ 470 | R$ 705

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- Definition The amount of current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-current financial assets measured at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss. + References No definition available. + Details
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