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Acquisitions (Details)
£ in Billions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
GBP (£)
item
Jun. 20, 2024
GBP (£)
Retail banking assets and liabilities of Sainsbury's Bank plc      
Disclosure of detailed information about business combination [line items]      
Gross customer assets to be acquired in asset acquisition     £ 2.5
Unsecured personal loans to be acquired in asset acquisition     1.4
Credit card balances to be acquired in asset acquisition     1.1
Customer deposits to be assumed in asset acquisition     £ 2.6
Residential mortgages from Metro Bank Plc      
Disclosure of detailed information about business combination [line items]      
Impact on CET1 ratio upon completion of asset acquisition   (0.10%)  
Residential mortgages to be acquired in asset acquisition   £ 2.5  
Percentage of loan to value of mortgages to be acquired in asset acquisition   62.00%  
Number of customer accounts to be acquired in asset acquisition | item   10,000  
Forecast | Retail banking assets and liabilities of Sainsbury's Bank plc      
Disclosure of detailed information about business combination [line items]      
Impact on CET1 ratio upon completion of asset acquisition 0.20%