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Note 22 - Financial Liabilities at Fair Value Through Profit or Loss - Trading Liabilities FVTPL (Details) - ARS ($) | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Trading liabilities Abstract |  |  |
Short Sold Positions | $ 692,270,000 | $ 0 | $ 0
Total Trading Liabilities | $ 692,270,000 | $ 0 | $ 0

X
- Definition The amount of trading liabilities (short sold positions) at fair value through profit or loss. + References No definition available. + Details
Name: | bfr_Shortsoldpositions
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of short sold positions. + References No definition available. + Details
Name: | bfr_Tradingliabilities
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | bfr_Tradingliabilitiesabstract
Namespace Prefix: | bfr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration