Dividends on ordinary shares - Narrative (Details) - GBP (£) £ / shares in Units, £ in Billions |
3 Months Ended | 6 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Sep. 30, 2025 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Share buyback | Maximum | ||||
| Disclosure of classes of share capital [line items] | ||||
| Increase (decrease) through treasury share transactions, equity | £ 1 | |||
| Ordinary shares | ||||
| Disclosure of classes of share capital [line items] | ||||
| Interim dividends, per share (in GBP per share) | £ 0.030 | £ 0.029 | £ 0.055 | |
| Number of shares comprising, one american depository share (in shares) | 4 | |||
| Qualifying American depository shares | ||||
| Disclosure of classes of share capital [line items] | ||||
| Interim dividends, per share (in GBP per share) | £ 0.120 | |||