Basis for the presentation of the consolidated financial statements and applicable accounting standard - Summary of Equity In Subsidiaries And Non controlling Interests (Details) - shares	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Consolidate financial Statements of Subsidiaries Explanatory [Line Items]
Proportion of voting rights held in subsidiary	50.00%
Volkswagen Financial Services Cía. Financiera S.A.
Disclosure Of Consolidate financial Statements of Subsidiaries Explanatory [Line Items]
Number of shares outstanding	897,000,000	897,000,000	897,000,000
Percentage of share capital Held By Subsidiary	51.00%	51.00%	51.00%
Proportion of voting rights held in subsidiary	51.00%	51.00%	51.00%
Percentage of share capital Held By Noncontrolling Interests	49.00%	49.00%	49.00%
Proportion of voting rights held by non-controlling interests	49.00%	49.00%	49.00%
PSA Finance Arg. Cía. Financiera S.A.
Disclosure Of Consolidate financial Statements of Subsidiaries Explanatory [Line Items]
Number of shares outstanding	52,178	52,178	52,178
Percentage of share capital Held By Subsidiary	50.00%	50.00%	50.00%
Proportion of voting rights held in subsidiary	50.00%	50.00%	50.00%
Percentage of share capital Held By Noncontrolling Interests	50.00%	50.00%	50.00%
Proportion of voting rights held by non-controlling interests	50.00%	50.00%	50.00%
Consolidar Administradora de Fondos de Jubilaciones y Pensiones S.A.(undergoing liquidation proceedings)
Disclosure Of Consolidate financial Statements of Subsidiaries Explanatory [Line Items]
Number of shares outstanding	115,738,503	115,738,503	115,738,503
Percentage of share capital Held By Subsidiary	53.89%	53.89%	53.89%
Proportion of voting rights held in subsidiary	53.89%	53.89%	53.89%
Percentage of share capital Held By Noncontrolling Interests	46.11%	46.11%	46.11%
Proportion of voting rights held by non-controlling interests	46.11%	46.11%	46.11%
BBVA Asset Management Argentina S.A.U. Sociedad Gerente de Fondos Comunes de Inversión
Disclosure Of Consolidate financial Statements of Subsidiaries Explanatory [Line Items]
Number of shares outstanding	242,524	242,524	242,524
Percentage of share capital Held By Subsidiary	100.00%	100.00%	100.00%
Proportion of voting rights held in subsidiary	100.00%	100.00%	100.00%
Percentage of share capital Held By Noncontrolling Interests	0.00%	0.00%	0.00%
Proportion of voting rights held by non-controlling interests	0.00%	0.00%	0.00%

Disclosure of consolidate financial statements of subsidiaries explanatory.

No definition available.

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

- Definition

Percentage of share capital held by noncontrolling interests.

+ References

No definition available.

+ Details

Name:	bbar_PercentageOfShareCapitalHeldByNoncontrollingInterests
Namespace Prefix:	bbar_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of share capital held by subsidiary.

+ References

No definition available.

+ Details

Name:	bbar_PercentageOfShareCapitalHeldBySubsidiary
Namespace Prefix:	bbar_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 79
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_79_a_iv&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_NumberOfSharesOutstanding
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The proportion of the voting rights in a subsidiary held by the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2022-03-24
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2022-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2022-03-24
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2022-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2022-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2022-03-24
-Paragraph 19B
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_19B_c&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_ProportionOfVotingPowerHeldInSubsidiary
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2022-03-24
-Paragraph 12
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2022-en-r&anchor=para_12_d&doctype=Standard
-URIDate 2022-03-24

+ Details

Name:	ifrs-full_ProportionOfVotingRightsHeldByNoncontrollingInterests
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=bbar_VolkswagenFinancialServicesCa.FinancieraS.a.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=bbar_PsaFinanceArg.Ca.FinancieraS.a.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=bbar_ConsolidarAdministradoraDeFondosDeJubilacionesYPensionesS.a.UndergoingLiquidationProceedings1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=bbar_BbvaAssetManagementArgentinaS.a.u.SociedadGerenteDeFondosComunesDeInversinMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: