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Financial Instruments Risks - Sensitivity of the Economic Value SEV (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Sensitivity Of The Economic Value Given A Variation Of 100 Basis Points [Abstract]
Closing	0.95%	0.38%
Minimum	0.54%	0.17%
Maximum	1.34%	0.47%
Average	0.81%	0.34%

X

- Definition

Average SEV given a variation of 100 basis points with respect to Core Capital.

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No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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- Definition

Closing SEV given a variation of 100 basis points with respect to Core Capital.

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No definition available.

+ Details

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- Definition

Maximum SEV given a variation of 100 basis points with respect to Core Capital.

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No definition available.

+ Details

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

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- Definition

Minimum SEV given a variation of 100 basis points with respect to Core Capital.

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No definition available.

+ Details

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

X

- Definition

Sensitivity of the economic value given a variation of 100 basis points.

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No definition available.

+ Details

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