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Share-based payments - Movement on Ordinary Shares Granted for Significant Restricted Stock Plans (Details)
shares in Millions
 12 Months Ended
Dec. 31, 2023
shares
£ / shares
Dec. 31, 2022
shares
£ / shares
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 | shares 20.4 16.7
Number of shares, Granted | shares 7.8 6.1
Number of shares, Forfeited | shares (1.4) (2.2)
Number of shares, Vested | shares (3.9) (0.2)
Number of shares, Non-vested ending balance | shares 22.9 20.4
Weighted average fair value, Non-vested beginning balance (pound per share) | £ / shares £ 9.24 £ 9
Weighted average fair value, Granted (pound per share) | £ / shares 9.19 10.25
Weighted average fair value, Forfeited (pound per share) | £ / shares 9.47 10.55
Weighted average fair value, Vested (pound per share) | £ / shares 7.52 6.13
Weighted average fair value, Non-vested ending balance (pound per share) | £ / shares £ 9.50 £ 9.24
Performance Share Awards (PSA)    
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items]    
Number of shares, Non-vested beginning balance | shares 4.1 3.1
Number of shares, Granted | shares 2.3 4.0
Number of shares, Forfeited | shares (0.5) (0.2)
Number of shares, Vested | shares (0.4) (2.8)
Number of shares, Non-vested ending balance | shares 5.5 4.1
Weighted average fair value, Non-vested beginning balance (pound per share) | £ / shares £ 9.52 £ 6.04
Weighted average fair value, Granted (pound per share) | £ / shares 8.57 9.11
Weighted average fair value, Forfeited (pound per share) | £ / shares 9.39 7.98
Weighted average fair value, Vested (pound per share) | £ / shares 9.26 5.19
Weighted average fair value, Non-vested ending balance (pound per share) | £ / shares £ 9.15 £ 9.52
Leadership Share Awards    
Disclosure of movement on ordinary shares granted for significant restricted stock plans [line items]    
Number of shares, Non-vested beginning balance | shares 11.3 10.4
Number of shares, Granted | shares 5.9 4.9
Number of shares, Forfeited | shares (1.0) (1.2)
Number of shares, Vested | shares (3.8) (2.8)
Number of shares, Non-vested ending balance | shares 12.4 11.3
Weighted average fair value, Non-vested beginning balance (pound per share) | £ / shares £ 8.99 £ 9.22
Weighted average fair value, Granted (pound per share) | £ / shares 6.54 7.87
Weighted average fair value, Forfeited (pound per share) | £ / shares 9.34 8.81
Weighted average fair value, Vested (pound per share) | £ / shares 6.73 7.95
Weighted average fair value, Non-vested ending balance (pound per share) | £ / shares £ 8.48 £ 8.99