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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, 2021 | Dec. 31, 2020
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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$ 1,375,782 | R$ 1,275,799
Financial assets securities [Member] |  |
Disclosure of maturity analysis for derivative financial assets designated at fair value through profit or loss [Line Items] |  |
Amortized cost | 147,746 | 129,804
Fair Value | 145,798 | 126,739
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 | 45,353 | 38,285
Fair Value | 45,169 | 37,672
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 | 45,353 | 38,285
Fair Value | 45,169 | 37,672
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 | 102,393 | 91,519
Fair Value | 100,629 | 89,067
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 | 70,924 | 56,447
Fair Value | 69,965 | 55,070
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 | 26,404 | 24,434
Fair Value | 25,600 | 23,697
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 | 5,065 | 10,638
Fair Value | R$ 5,064 | R$ 10,300

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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 2021-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_f&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 + Details
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