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Share-based payments - Movement on Ordinary Shares Granted for Significant Restricted Stock Plans (Details) shares in Millions | 12 Months Ended
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Dec. 31, 2024 shares £ / shares | Dec. 31, 2023 shares £ / shares
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items] |  |
Number of dividend equivalent shares granted (in shares) | 1.2 | 0.5
Executive Performance Share Plan (EPSP) |  |
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items] |  |
Number of shares, Non-vested beginning balance | 23.0 | 20.0
Number of shares, Granted | 11.0 | 8.0
Number of shares, Forfeited | (5.0) | (1.0)
Number of shares, Vested | (4.0) | (4.0)
Number of shares, Non-vested ending balance | 25.0 | 23.0
Weighted average fair value, Non-vested beginning balance (pound per share) | £ / shares | £ 9.50 | £ 9.24
Weighted average fair value, Granted (pound per share) | £ / shares | 7.38 | 9.19
Weighted average fair value, Forfeited (pound per share) | £ / shares | 9.80 | 9.47
Weighted average fair value, Vested (pound per share) | £ / shares | 9.49 | 7.52
Weighted average fair value, Non-vested ending balance (pound per share) | £ / shares | £ 8.53 | £ 9.50
Bonus-related Share Awards |  |
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items] |  |
Number of shares, Non-vested beginning balance | 12.0 | 7.0
Number of shares, Granted | 7.0 | 7.0
Number of shares, Forfeited | (1.0) | (1.0)
Number of shares, Vested | (6.0) | (1.0)
Number of shares, Non-vested ending balance | 12.0 | 12.0
Weighted average fair value, Non-vested beginning balance (pound per share) | £ / shares | £ 9.03 | £ 9.50
Weighted average fair value, Granted (pound per share) | £ / shares | 8.20 | 8.62
Weighted average fair value, Forfeited (pound per share) | £ / shares | 8.61 | 9.25
Weighted average fair value, Vested (pound per share) | £ / shares | 8.77 | 9.10
Weighted average fair value, Non-vested ending balance (pound per share) | £ / shares | £ 8.73 | £ 9.03
Leadership Share Awards |  |
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items] |  |
Number of shares, Non-vested beginning balance | 12.0 | 11.0
Number of shares, Granted | 5.0 | 6.0
Number of shares, Forfeited | (1.0) | (1.0)
Number of shares, Vested | (3.0) | (4.0)
Number of shares, Non-vested ending balance | 13.0 | 12.0
Weighted average fair value, Non-vested beginning balance (pound per share) | £ / shares | £ 8.48 | £ 8.99
Weighted average fair value, Granted (pound per share) | £ / shares | 8.72 | 6.54
Weighted average fair value, Forfeited (pound per share) | £ / shares | 8.44 | 9.34
Weighted average fair value, Vested (pound per share) | £ / shares | 10.26 | 6.73
Weighted average fair value, Non-vested ending balance (pound per share) | £ / shares | £ 8.21 | £ 8.48

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