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Loan from a shareholder (Details) - EUR (€)	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loan From a Shareholder [Abstract]
Loan from a shareholder	€ 20,000
Interest-free with repayment	€ 0	€ 6,000	€ 7,000	€ 7,000	€ 20,000

X

- Definition

Amount of Interest free repayment.

+ References

No definition available.

+ Details

Name:	brer_InterestFreeRepayment
Namespace Prefix:	brer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of loan from a shareholder.

+ References

No definition available.

+ Details

Name:	brer_LoanFromShareholder
Namespace Prefix:	brer_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	brer_LoanfromashareholderDetailsLineItems
Namespace Prefix:	brer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration