Subordinated liabilities - Narrative (Details) - GBP (£) £ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Disclosure of detailed information about borrowings [line items] | ||
| Issuances | £ 1,045 | £ 1,870 |
| Redemption of subordinated debt | £ 115 | £ 476 |
| Barclays PLC | 4.616% Fixed Rate Resetting Subordinated Callable Notes | Fixed interest rate | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Borrowings, interest rate | 4.616% | |
| Barclays PLC | 3.750% Fixed Rate Resetting Subordinated Callable Notes | Fixed interest rate | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Borrowings, interest rate | 3.75% |