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Financial assets at fair value through profit or loss - Derivative Financial Assets FVTPL (Parenthetical) (Detail)	Oct. 01, 2021
Prisma Medios de Pago S.A. [Member]
Derivativefinancialassets [Line Items]
Percentage of Capital Stock to be Sold	49.00%

X

- Definition

Derivative financial assets .

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of capital stock to be sold .

+ References

No definition available.

+ Details

Name:	bbar_PercentageOfCapitalStockToBeSold
Namespace Prefix:	bbar_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=bbar_PrismamediosdepagosaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: