v3.25.2
Report of the directors financial review risk report - IFRS 9 ECL sensitivity (Details) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
ECL, weight assigned to scenarios 100.00%  
Allowance for ECL | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets £ (173) £ (165)
Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (56) (67)
Allowance for ECL | Credit cards and other retail    
Disclosure of financial assets [line items]    
Financial assets (1) (1)
Allowance for ECL | Central scenario | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (158) (155)
Allowance for ECL | Central scenario | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (56) (66)
Allowance for ECL | Central scenario | Credit cards and other retail    
Disclosure of financial assets [line items]    
Financial assets (1) (1)
Allowance for ECL | Upside scenario | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (135) (130)
Allowance for ECL | Upside scenario | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (55) (66)
Allowance for ECL | Upside scenario | Credit cards and other retail    
Disclosure of financial assets [line items]    
Financial assets (1) (1)
Allowance for ECL | Downside scenario , worst outcome | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (222) (192)
Allowance for ECL | Downside scenario , worst outcome | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (56) (67)
Allowance for ECL | Downside scenario , worst outcome | Credit cards and other retail    
Disclosure of financial assets [line items]    
Financial assets (1) (1)
Allowance for ECL | Downside scenario, additional | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (355) (552)
Allowance for ECL | Downside scenario, additional | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (62) (74)
Allowance for ECL | Downside scenario, additional | Credit cards and other retail    
Disclosure of financial assets [line items]    
Financial assets (1) (1)
Gross carrying/ nominal amount | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets 339,565 347,588
Gross carrying/ nominal amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 4,403 4,479
Gross carrying/ nominal amount | Credit cards and other retail    
Disclosure of financial assets [line items]    
Financial assets 68 68
– of which: UK | Allowance for ECL | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (34) (39)
– of which: UK | Allowance for ECL | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (2) (2)
– of which: UK | Allowance for ECL | Central scenario | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (31) (35)
– of which: UK | Allowance for ECL | Central scenario | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (2) (2)
– of which: UK | Allowance for ECL | Upside scenario | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (26) (25)
– of which: UK | Allowance for ECL | Upside scenario | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (2) (2)
– of which: UK | Allowance for ECL | Downside scenario , worst outcome | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (62) (50)
– of which: UK | Allowance for ECL | Downside scenario , worst outcome | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (2) (2)
– of which: UK | Allowance for ECL | Downside scenario, additional | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (101) (284)
– of which: UK | Allowance for ECL | Downside scenario, additional | Mortgages    
Disclosure of financial assets [line items]    
Financial assets (4) (4)
– of which: UK | Gross carrying/ nominal amount | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets 132,667 139,207
– of which: UK | Gross carrying/ nominal amount | Mortgages    
Disclosure of financial assets [line items]    
Financial assets 1,969 1,979
– of which: France | Allowance for ECL | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (93) (64)
– of which: France | Allowance for ECL | Central scenario | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (87) (63)
– of which: France | Allowance for ECL | Upside scenario | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (76) (55)
– of which: France | Allowance for ECL | Downside scenario , worst outcome | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (106) (76)
– of which: France | Allowance for ECL | Downside scenario, additional | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets (141) (99)
– of which: France | Gross carrying/ nominal amount | Corporate and commercial and NBFIs    
Disclosure of financial assets [line items]    
Financial assets £ 141,818 £ 145,484