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Provisions - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 ARS ($)
Provisions [abstract]
Estimate Of Undiscounted Claims That Arise From Contracts Contingnet Liabilities	$ 18,623
Estimated Actual ClaimsThat Arise From Contracts Results To Outflow Of Funds Contingent Liabilities	$ 2,566
Liabilities For Incurred Claims Arise That Arise From Contracts For Next Fiscal Year	12 months

X

- Definition

Estimate of undiscounted claims that arise from contracts contingnet liabilities.

+ References

No definition available.

+ Details

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X

- Definition

Estimated actual claims that arise from contracts results to outflow of funds contingent liabilities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Liabilities for incurred claims arise that arise from contracts for next fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	bbar_
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Balance Type:	na
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- References

No definition available.

+ Details

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