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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, 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