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Share capital and other equity (Details) - GBP (£)
£ / shares in Units, shares in Thousands, £ in Millions
Dec. 31, 2023
Dec. 31, 2022
Date of approval    
Par value per share £ 1.0769 £ 1.0769
Ordinary shares    
Date of approval    
Allotted, called up and fully paid £ 9,683.0 £ 10,539.0
Number of shares 8,991,737 9,786,024
Par value per share £ 1.076923076923077  
Cumulative preference shares of 1    
Date of approval    
Allotted, called up and fully paid £ 0.5 £ 0.5
Number of shares 483 483
Par value per share £ 1 £ 1