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 £ 186,243 £ 166,244
Financial assets at fair value through the income statement 216,633 191,845
Derivative financial instruments 279,671 292,356
Financial assets at fair value through other comprehensive income 46,136 51,010
Trading portfolio liabilities (67,802) (56,182)
Financial liabilities designated at fair value (315,762) (279,777)
Derivative financial instruments (265,289) (279,331)
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 6,387 5,991
Derivative financial instruments 1,983 2,073
Financial assets at fair value through other comprehensive income 3,144 3,674
Investment property 42 9
Total assets 21,435 21,862
Trading portfolio liabilities (424) (395)
Financial liabilities designated at fair value (2,831) (3,241)
Derivative financial instruments (2,861) (3,181)
Total liabilities (6,116) (6,817)
Significant unobservable inputs (Level 3) | Interest rate risk    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 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 risk    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 611 477
Total assets 611 477
Derivative financial instruments (1,349) (1,219)
Total liabilities (1,349) (1,219)
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 4,661 3,991
Financial assets at fair value through other comprehensive income 2,350 2,858
Total assets 12,479 12,995
Significant unobservable inputs (Level 3) | Corporate debt    
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 37 47
Total assets 2,715 2,550
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 206 219
Total assets 206 219
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 73 155
Derivative financial instruments 457 403
Investment property 42 9
Total assets 1,058 937
Trading portfolio liabilities (63) (15)
Financial liabilities designated at fair value (16) (20)
Derivative financial instruments (738) (949)
Total liabilities £ (817) £ (984)