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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, 2023
GBP (£)
£ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
GBP (£)
£ / shares
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Borrowings          
Equity £ 37,188   £ 36,496 £ 41,803 [1] £ 43,824
Notional amount     £ 13,925,000    
Par value | £ / shares £ 1.0769   £ 1.0769    
Paid-in equity          
Borrowings          
Equity £ 3,890   £ 3,890 3,890 [1] £ 4,999
Paid-in equity | Additional tier 1 note callable August, 2025, USD          
Borrowings          
Equity £ 735   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        
Conversion rate | £ / shares £ 1.764        
Paid-in equity | Additional tier 1 notes, callable June 2031, USD          
Borrowings          
Equity £ 538   £ 538 £ 538  
Notional amount | $   $ 750      
Conversion rate | $ / shares   $ 2.462      
Paid-in equity | Minimum | Instruments are converted to into ordinary shares at fixed price          
Borrowings          
CET1 ratio (as a percent) 7.00% 7.00%      
[1] In 2021, the Total equity balance of £41,803 million includes £494 million attributable to Preference shareholders.