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Financial Assets at Amortized Cost-Securities - Summary of Amortized Cost of Financial Assets at Amortized Cost (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | R$ 1,010,644 | R$ 994,759
Financial assets securities [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | 133,119 | 110,395
Fair Value | 130,466 | 106,749
Financial assets securities [Member] | Current [member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | 30,113 | 14,661
Fair Value | 29,766 | 14,119
Financial assets securities [Member] | Current [member] | Up to one year [member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | 30,113 | 14,661
Fair Value | 29,766 | 14,119
Financial assets securities [Member] | Non-current [member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | 103,006 | 95,734
Fair Value | 100,700 | 92,630
Financial assets securities [Member] | Non-current [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] |  |
Amortized cost | 57,120 | 51,820
Fair Value | 56,178 | 50,970
Financial assets securities [Member] | Non-current [member] | From five to ten years [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | 34,599 | 31,318
Fair Value | 33,512 | 29,802
Financial assets securities [Member] | Non-current [member] | After ten years [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | 11,287 | 12,596
Fair Value | R$ 11,010 | R$ 11,858

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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_f&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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