v3.25.2
Credit Risk - Economic uncertainty adjustments and Other adjustments (Narrative) (Details) - GBP (£)
£ in Millions
Jun. 30, 2025
Dec. 31, 2024
Loans and advances at amortised cost including debt securities    
Disclosure of financial assets [line items]    
Financial assets £ (417,764) £ (414,483)
Impairment allowance    
Disclosure of financial assets [line items]    
Financial assets 5,395 5,532
Impairment allowance | Loans and advances at amortised cost including debt securities    
Disclosure of financial assets [line items]    
Financial assets 4,970 5,093
Impairment allowance | Retail mortgages    
Disclosure of financial assets [line items]    
Financial assets 180 187
Impairment allowance | Retail credit cards    
Disclosure of financial assets [line items]    
Financial assets 3,108 3,307
Impairment allowance | Corporate loans    
Disclosure of financial assets [line items]    
Financial assets 1,203 1,166
Impairment allowance | Retail other    
Disclosure of financial assets [line items]    
Financial assets 455 410
Impairment allowance | Post-model adjustment    
Disclosure of financial assets [line items]    
Financial assets 87  
Impairment allowance | Post-model adjustment, net of significant risk transfer    
Disclosure of financial assets [line items]    
Financial assets 70  
Impairment allowance | Economic uncertainty adjustments    
Disclosure of financial assets [line items]    
Financial assets 154 78
Impairment allowance | Economic uncertainty adjustments | Loans and advances at amortised cost including debt securities    
Disclosure of financial assets [line items]    
Financial assets 154 78
Impairment allowance | Economic uncertainty adjustments | Loans and advances    
Disclosure of financial assets [line items]    
Financial assets 153 78
Impairment allowance | Economic uncertainty adjustments | Loans and advances | Cross default risk    
Disclosure of financial assets [line items]    
Financial assets 128 53
Impairment allowance | Economic uncertainty adjustments | Loans and advances | Model uncertainty risk    
Disclosure of financial assets [line items]    
Financial assets 25 25
Impairment allowance | Economic uncertainty adjustments | Retail mortgages | Model uncertainty risk    
Disclosure of financial assets [line items]    
Financial assets 25 25
Impairment allowance | Economic uncertainty adjustments | Corporate loans    
Disclosure of financial assets [line items]    
Financial assets 87  
Impairment allowance | Economic uncertainty adjustments | Debt securities at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 1 0
Impairment allowance | Other adjustments    
Disclosure of financial assets [line items]    
Financial assets 14 150
Impairment allowance | Other adjustments | Loans and advances    
Disclosure of financial assets [line items]    
Financial assets 14 157
Impairment allowance | Other adjustments | Debt securities at amortised cost    
Disclosure of financial assets [line items]    
Financial assets 0 (7)
Impairment allowance | UK | Economic uncertainty adjustments | Loans and advances    
Disclosure of financial assets [line items]    
Financial assets 79 78
Impairment allowance | UK | Economic uncertainty adjustments | Retail mortgages    
Disclosure of financial assets [line items]    
Financial assets 36 36
Impairment allowance | UK | Economic uncertainty adjustments | Retail mortgages | Cross default risk    
Disclosure of financial assets [line items]    
Financial assets 11 11
Impairment allowance | UK | Economic uncertainty adjustments | Retail credit cards    
Disclosure of financial assets [line items]    
Financial assets 0 0
Impairment allowance | UK | Economic uncertainty adjustments | Corporate loans    
Disclosure of financial assets [line items]    
Financial assets 43 42
Impairment allowance | UK | Economic uncertainty adjustments | Corporate loans | Cross default risk    
Disclosure of financial assets [line items]    
Financial assets 43 42
Impairment allowance | UK | Economic uncertainty adjustments | Retail other    
Disclosure of financial assets [line items]    
Financial assets 0 0
Impairment allowance | UK | Other adjustments | Loans and advances    
Disclosure of financial assets [line items]    
Financial assets 69 178
Impairment allowance | UK | Other adjustments | Retail mortgages    
Disclosure of financial assets [line items]    
Financial assets 72 71
Impairment allowance | UK | Other adjustments | Retail credit cards    
Disclosure of financial assets [line items]    
Financial assets (127) (22)
Impairment allowance | UK | Other adjustments | Corporate loans    
Disclosure of financial assets [line items]    
Financial assets 40 39
Impairment allowance | UK | Other adjustments | Retail other    
Disclosure of financial assets [line items]    
Financial assets 84 90
Impairment allowance | Rest of the world | Economic uncertainty adjustments | Loans and advances    
Disclosure of financial assets [line items]    
Financial assets 74 0
Impairment allowance | Rest of the world | Economic uncertainty adjustments | Retail mortgages    
Disclosure of financial assets [line items]    
Financial assets 0 0
Impairment allowance | Rest of the world | Economic uncertainty adjustments | Retail credit cards    
Disclosure of financial assets [line items]    
Financial assets 30 0
Impairment allowance | Rest of the world | Economic uncertainty adjustments | Retail credit cards | Cross default risk    
Disclosure of financial assets [line items]    
Financial assets 30 0
Impairment allowance | Rest of the world | Economic uncertainty adjustments | Corporate loans    
Disclosure of financial assets [line items]    
Financial assets 44 0
Impairment allowance | Rest of the world | Economic uncertainty adjustments | Corporate loans | Cross default risk    
Disclosure of financial assets [line items]    
Financial assets 44 0
Impairment allowance | Rest of the world | Economic uncertainty adjustments | Retail other    
Disclosure of financial assets [line items]    
Financial assets 0 0
Impairment allowance | Rest of the world | Other adjustments | Loans and advances    
Disclosure of financial assets [line items]    
Financial assets (55) (21)
Impairment allowance | Rest of the world | Other adjustments | Retail mortgages    
Disclosure of financial assets [line items]    
Financial assets 0 0
Impairment allowance | Rest of the world | Other adjustments | Retail credit cards    
Disclosure of financial assets [line items]    
Financial assets 0 (23)
Impairment allowance | Rest of the world | Other adjustments | Corporate loans    
Disclosure of financial assets [line items]    
Financial assets (55) (2)
Impairment allowance | Rest of the world | Other adjustments | Retail other    
Disclosure of financial assets [line items]    
Financial assets £ 0 £ 4