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Note 40 - Financial Instruments Risks - Forward Transactions and Foreign Currency Forward (Details) - ARS ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Foreign Currency Forward Transactions Abstract |  |
Foreign Currency Forward Purchases In US Dollars | $ 620,651,000 | $ 658,575,000
Foreign Currency Forward Sales In US Dollars | 760,615,000 | 645,582,000
Foreign Currency Forward Sales In Euros | $ 5,463,000 | $ 4,818,000

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- Definition Foreign currency forward purchases in US Dollars. + References No definition available. + Details
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Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Foreign currency forward sales in Euros. + References No definition available. + Details
Name: | bfr_Foreigncurrencyforwardsalesineuros
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Foreign currency forward sales in US Dollars. + References No definition available. + Details
Name: | bfr_Foreigncurrencyforwardsalesinusdollars
Namespace Prefix: | bfr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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