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Financial Assets at Fair Value Through Other Comprehensive Income - Summary of Gross Carrying Amount and Fair Value of Financial Assets Through Other Comprehensive Income-Securities by Maturity (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | R$ 10,258 | R$ 10,666
Current Fair value | 10,272 | 10,684
Non-current gross carrying amount | 64,442 | 37,997
Non-current fair value | 66,388 | 38,639
Gross carrying amount | 74,700 | 48,663
Fair value | 76,660 | 49,323
Non-stated maturity [Member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 83 | 77
Current Fair value | 149 | 161
Up to one year [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Gross carrying amount | 10,175 | 10,589
Current Fair value | 10,123 | 10,523
From one to five years [member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Non-current gross carrying amount | 45,704 | 21,417
Non-current fair value | 46,456 | 21,650
From five to ten years [Member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Non-current gross carrying amount | 11,101 | 11,906
Non-current fair value | 11,649 | 12,029
After ten years [Member] |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |
Non-current gross carrying amount | 7,637 | 4,674
Non-current fair value | R$ 8,283 | R$ 4,960

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- Definition The amount of current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard -URIDate 2019-03-27 + Details
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