Name:	bbplc_CashRepaymentsOfAdvancesAndLoansToRelatedPartiesAndChangeOfKeyManagmentPersonnel
Namespace Prefix:	bbplc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Reconciliation of receivables from related parties

No definition available.

Name:	bbplc_ReconciliationOfReceivablesFromRelatedPartiesRollForward
Namespace Prefix:	bbplc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amounts payable resulting from related party transactions. [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2022-03-24
-Paragraph 20
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_20&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2022-03-24
-Paragraph 18
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=24&code=ifrs-tx-2022-en-r&anchor=para_18_b&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_AmountsPayableRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The amounts receivable resulting from related party transactions. [Refer: Related parties [member]]

Name:	ifrs-full_AmountsReceivableRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The cash inflow from advances and loans from related parties. [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_17&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_CashAdvancesAndLoansFromRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash outflow for loans and advances made to related parties. [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2022-03-24
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2022-en-r&anchor=para_16&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_CashAdvancesAndLoansMadeToRelatedParties
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The cash outflow for repayments of advances and loans from related parties. [Refer: Related parties [member]]