Name:	bfr_Disclosureofmostsignificantinvestmentsinassociateslineitems
Namespace Prefix:	bfr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The equity related to the most significant investment in joint ventures and associates.

No definition available.

Name:	bfr_Equityofjointventuresandassociates
Namespace Prefix:	bfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The amount of liabilities related to the most significant investment in joint ventures and associates.

No definition available.

Name:	bfr_Liabilitiesofjointventuresandassociates
Namespace Prefix:	bfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The profit related to the most significant investment in joint ventures and associates.

No definition available.

Name:	bfr_Profitofjointventuresandassociates
Namespace Prefix:	bfr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2018-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_iii&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2018-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_iii&doctype=Standard
-URIDate 2018-03-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph 19B
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19B_c&doctype=Standard
-URIDate 2018-03-16