v3.25.2
Fair value of financial instruments - Level 3 assets and liabilities held at fair value disaggregated by product type (Details) - GBP (£)
£ in Millions
Jun. 30, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Trading portfolio assets £ 187,223 £ 166,453
Financial assets at fair value through the income statement 218,552 193,734
Derivative financial assets 280,194 293,530
Financial assets at fair value through other comprehensive income 77,311 78,059
Trading portfolio liabilities (69,305) (56,908)
Financial liabilities designated at fair value (317,485) (282,224)
Derivative financial instruments (265,376) (279,415)
Significant unobservable inputs (Level 3)    
Disclosure of detailed information about financial instruments [line items]    
Trading portfolio assets 9,879 10,115
Financial assets at fair value through the income statement 8,831 8,424
Derivative financial assets 1,989 2,077
Financial assets at fair value through other comprehensive income 3,178 3,739
Investment property 42 9
Total assets 23,919 24,364
Trading portfolio liabilities (424) (395)
Financial liabilities designated at fair value (2,848) (3,258)
Derivative financial instruments (2,861) (3,181)
Total liabilities (6,133) (6,834)
Significant unobservable inputs (Level 3) | Loans    
Disclosure of detailed information about financial instruments [line items]    
Trading portfolio assets 5,468 6,146
Financial assets at fair value through the income statement 6,096 5,455
Financial assets at fair value through other comprehensive income 2,350 2,858
Total assets 13,914 14,459
Significant unobservable inputs (Level 3) | Corporate loans    
Disclosure of detailed information about financial instruments [line items]    
Trading portfolio assets 1,843 1,590
Financial assets at fair value through the income statement 835 913
Financial assets at fair value through other comprehensive income 67 108
Total assets 2,745 2,611
Trading portfolio liabilities (36) (374)
Total liabilities (36) (374)
Significant unobservable inputs (Level 3) | Asset backed securities    
Disclosure of detailed information about financial instruments [line items]    
Trading portfolio assets 883 991
Financial assets at fair value through the income statement 178 139
Financial assets at fair value through other comprehensive income 757 757
Total assets 1,818 1,887
Trading portfolio liabilities   (6)
Total liabilities   (6)
Significant unobservable inputs (Level 3) | Government debt    
Disclosure of detailed information about financial instruments [line items]    
Trading portfolio assets 1,199 1,018
Financial assets at fair value through the income statement 32 35
Financial assets at fair value through other comprehensive income   12
Total assets 1,231 1,065
Trading portfolio liabilities (325)  
Total liabilities (325)  
Significant unobservable inputs (Level 3) | Private equity investments    
Disclosure of detailed information about financial instruments [line items]    
Financial assets at fair value through the income statement 1,187 1,166
Financial assets at fair value through other comprehensive income 4 4
Total assets 1,191 1,170
Financial liabilities designated at fair value (17) (17)
Total liabilities (17) (17)
Significant unobservable inputs (Level 3) | Issued debt    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities designated at fair value (1,575) (1,842)
Total liabilities (1,575) (1,842)
Significant unobservable inputs (Level 3) | Reverse repurchase and repurchase agreements    
Disclosure of detailed information about financial instruments [line items]    
Financial assets at fair value through the income statement 402 539
Total assets 402 539
Financial liabilities designated at fair value (1,240) (1,379)
Total liabilities (1,240) (1,379)
Significant unobservable inputs (Level 3) | Other products    
Disclosure of detailed information about financial instruments [line items]    
Trading portfolio assets 486 370
Financial assets at fair value through the income statement 101 177
Derivative financial assets 457 403
Investment property 42 9
Total assets 1,086 959
Trading portfolio liabilities (63) (15)
Financial liabilities designated at fair value (16) (20)
Derivative financial instruments (738) (949)
Total liabilities (817) (984)
Significant unobservable inputs (Level 3) | Interest rate derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 915 1,193
Total assets 915 1,193
Derivative financial instruments (774) (1,013)
Total liabilities (774) (1,013)
Significant unobservable inputs (Level 3) | Equity derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 617 481
Total assets 617 481
Derivative financial instruments (1,349) (1,219)
Total liabilities £ (1,349) £ (1,219)