v3.25.2
Fair value of financial instruments - Unrealised gains and losses recognised in the period on Level 3 assets and liabilities held at period end (Details) - GBP (£)
£ in Millions
6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Disclosure of detailed information about financial instruments [line items]    
Trading income £ 4,171 £ 3,228
Other income 37 23
Other comprehensive income 873 (1,002)
Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments [line items]    
Trading income 233 (192)
Other income 38 48
Other comprehensive income 0 0
Total 271 (144)
Significant unobservable inputs (Level 3) | Investment property    
Disclosure of detailed information about financial instruments [line items]    
Trading income 0 0
Other income 0 0
Other comprehensive income 0 0
Total 0 0
Significant unobservable inputs (Level 3) | Net derivative financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Trading income 164 (180)
Other income 3 0
Other comprehensive income 0 0
Total 167 (180)
Trading portfolio liabilities | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments [line items]    
Trading income 34 17
Other income 0 0
Other comprehensive income 0 0
Total 34 17
Financial liabilities designated at fair value | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments [line items]    
Trading income 87 (29)
Other income 0 (10)
Other comprehensive income 0 0
Total 87 (39)
Trading portfolio assets | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments [line items]    
Trading income 21 (2)
Other income 0 0
Other comprehensive income 0 0
Total 21 (2)
Financial assets at fair value through the income statement | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments [line items]    
Trading income (74) 1
Other income 7 47
Other comprehensive income 0 0
Total (67) 48
Financial assets at fair value through other comprehensive income | Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments [line items]    
Trading income 1 1
Other income 28 11
Other comprehensive income 0 0
Total £ 29 £ 12