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Share capital and other equity - Paid-in equity (Details)
£ / shares in Units, $ / shares in Units, £ in Millions, $ in Millions
Dec. 31, 2024
GBP (£)
£ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
GBP (£)
£ / shares
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Borrowings          
Equity £ 39,378   £ 37,188 £ 36,496 £ 41,803
Par value | £ / shares £ 1.0769   £ 1.0769    
Paid-in equity          
Borrowings          
Equity £ 5,280   £ 3,890 3,890 £ 3,890
Paid-in equity | Additional tier 1 note callable August, 2025, USD          
Borrowings          
Equity £ 736   735 735  
Notional amount | $   $ 1,150      
Interest rate 8.00% 8.00%      
Conversion rate | $ / shares   $ 3.314      
Paid-in equity | Additional tier 1 note callable December 2025 - June, 2026, USD          
Borrowings          
Equity £ 1,220   1,220 1,220  
Notional amount | $   $ 1,500      
Interest rate 6.00% 6.00%      
Conversion rate | $ / shares   $ 2.191      
Paid-in equity | Additional tier1 note callable May - November 2027, GBP          
Borrowings          
Equity £ 998   998 998  
Notional amount £ 1,000        
Interest rate 5.125% 5.125%      
Conversion rate | £ / shares £ 1.764        
Paid-in equity | Additional tier 1 notes, callable March 2028, GBP          
Borrowings          
Equity £ 399   399 399  
Notional amount £ 400        
Interest rate 4.50% 4.50%      
Conversion rate | £ / shares £ 1.764        
Paid-in equity | Additional tier 1 notes, callable June 2031, USD          
Borrowings          
Equity £ 539   £ 538 £ 538  
Notional amount | $   $ 750      
Interest rate 4.60% 4.60%      
Conversion rate | $ / shares   $ 2.462      
Paid-in equity | Additional tier 1 notes, callable November 2033, USD          
Borrowings          
Equity £ 798        
Notional amount | $   $ 1,000      
Interest rate 8.125% 8.125%      
Conversion rate | $ / shares   $ 2.205      
Paid-in equity | Additional tier 1 notes, callable November 2034, USD          
Borrowings          
Equity £ 590        
Notional amount | $   $ 750      
Interest rate 7.30% 7.30%      
Conversion rate | $ / shares   $ 2.226      
Paid-in equity | Minimum | Instruments are converted to into ordinary shares at fixed price          
Borrowings          
CET1 ratio (as a percent) 7.00% 7.00%