v3.25.4
Fair values of financial assets and liabilities - Schedule of Sensitivity of Level 3 Valuations (Details)
£ in Millions
Dec. 31, 2025
GBP (£)
Dec. 31, 2024
GBP (£)
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers £ 481,463 £ 459,857
Total financial assets at fair value through profit or loss 240,413 215,925
Asset-backed securities 3 0
Derivative financial instruments 19,727 24,065
Financial liabilities at fair value through profit or loss 27,909 27,611
Derivative financial instruments 16,132 21,676
Level 3 financial assets carried at fair value 296,460 270,680
Level 3 financial liabilities carried at fair value 105,681 100,515
Level 3 £m    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 480,703 455,846
Total financial assets at fair value through profit or loss 10,251 9,889
Derivative financial instruments 464 741
Derivative financial instruments 224 422
Favourable changes £m | Discounted cash flows | Financial liabilities at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at fair value through profit or loss 1 1
Unfavourable changes £m | Discounted cash flows | Financial liabilities at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at fair value through profit or loss (1) (1)
Gross carrying amount | Level 3 £m | Financial liabilities at fair value, class    
Disclosure of detailed information about financial instruments [line items]    
Level 3 financial liabilities carried at fair value 241 444
Gross carrying amount | Financial assets at fair value, class | Level 3 £m    
Disclosure of detailed information about financial instruments [line items]    
Level 3 financial assets carried at fair value 10,816 11,003
Gross carrying amount | Discounted cash flows | Financial liabilities at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Financial liabilities at fair value through profit or loss 17 22
Gross carrying amount | Option pricing model | Derivative liabilities £m    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 224 422
Gross carrying amount | Favourable changes £m | Option pricing model | Derivative liabilities £m    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 15 17
Gross carrying amount | Unfavourable changes £m | Option pricing model | Derivative liabilities £m    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments (13) (15)
Financial assets at fair value through profit or loss | Favourable changes £m | Discounted cash flows    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 168 245
Debt securities in issue at fair value through profit or loss 36 35
Financial assets at fair value through profit or loss | Favourable changes £m | Market approach    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments 101 150
Financial assets at fair value through profit or loss | Favourable changes £m | Underlying asset including property prices    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments 85 80
Unlisted equities, debt securities and property partnerships in the life funds 1 0
Financial assets at fair value through profit or loss | Unfavourable changes £m | Discounted cash flows    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers (159) (231)
Debt securities in issue at fair value through profit or loss (56) (55)
Financial assets at fair value through profit or loss | Unfavourable changes £m | Market approach    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments (101) (150)
Financial assets at fair value through profit or loss | Unfavourable changes £m | Underlying asset including property prices    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments (87) (84)
Unlisted equities, debt securities and property partnerships in the life funds (2) (7)
Financial assets at fair value through profit or loss | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Total financial assets at fair value through profit or loss 10,251 9,889
Financial assets at fair value through profit or loss | Gross carrying amount | Discounted cash flows    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 6,058 6,022
Debt securities in issue at fair value through profit or loss 860 621
Financial assets at fair value through profit or loss | Gross carrying amount | Market approach    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments 2,275 2,267
Financial assets at fair value through profit or loss | Gross carrying amount | Underlying asset including property prices    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments 811 773
Unlisted equities, debt securities and property partnerships in the life funds 247 206
Financial assets at fair value through other comprehensive income    
Disclosure of detailed information about financial instruments [line items]    
Asset-backed securities 217 197
Financial assets at fair value through other comprehensive income | Level 3 £m    
Disclosure of detailed information about financial instruments [line items]    
Asset-backed securities 50 48
Financial assets at fair value through other comprehensive income | Favourable changes £m | Underlying asset including property prices    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments 3 33
Financial assets at fair value through other comprehensive income | Favourable changes £m | Lead manager or broker quote/consensus pricing    
Disclosure of detailed information about financial instruments [line items]    
Asset-backed securities 2 2
Financial assets at fair value through other comprehensive income | Unfavourable changes £m | Underlying asset including property prices    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments (3) (33)
Financial assets at fair value through other comprehensive income | Unfavourable changes £m | Lead manager or broker quote/consensus pricing    
Disclosure of detailed information about financial instruments [line items]    
Asset-backed securities (2) (2)
Financial assets at fair value through other comprehensive income | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Financial assets available-for-sale 101 373
Financial assets at fair value through other comprehensive income | Gross carrying amount | Underlying asset including property prices    
Disclosure of detailed information about financial instruments [line items]    
Equity and venture capital investments 51 325
Financial assets at fair value through other comprehensive income | Gross carrying amount | Lead manager or broker quote/consensus pricing    
Disclosure of detailed information about financial instruments [line items]    
Asset-backed securities 50 48
Derivative assets £m | Favourable changes £m | Discounted cash flows    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 21 21
Derivative assets £m | Favourable changes £m | Option pricing model    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 4 4
Derivative assets £m | Unfavourable changes £m | Discounted cash flows    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments (21) (21)
Derivative assets £m | Unfavourable changes £m | Option pricing model    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments (4) (6)
Derivative assets £m | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 464 741
Derivative assets £m | Gross carrying amount | Discounted cash flows    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments 262 347
Derivative assets £m | Gross carrying amount | Option pricing model    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial instruments £ 202 £ 394
Interest rate spreads | Maximum | Financial liabilities at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, liabilities (0.0050) (0.0050)
Interest rate spreads | Minimum | Financial liabilities at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, liabilities 0.0050 0.0050
Interest rate spreads | Financial assets at fair value through profit or loss | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets (0.16) (0.0131)
Interest rate spreads | Financial assets at fair value through profit or loss | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets 0.16 0.0241
Credit spreads | Financial assets at fair value through profit or loss | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets (0.27) (0.17)
Credit spreads | Financial assets at fair value through profit or loss | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets 0.27 0.17
Earnings multiple | Financial assets at fair value through profit or loss | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets, multiple 0.10 15.0
Earnings multiple | Financial assets at fair value through profit or loss | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets, multiple (0.10) 3.5
Interest rate volatility | Maximum | Derivative liabilities £m    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, liabilities (1.95) (1.83)
Interest rate volatility | Minimum | Derivative liabilities £m    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, liabilities (0.12) (0.11)
Interest rate volatility | Derivative assets £m | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets (1.95) (1.83)
Interest rate volatility | Derivative assets £m | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets (0.12) (0.11)
Uncertainty of recovery rates | Derivative assets £m | Maximum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets (0.08) (0.08)
Uncertainty of recovery rates | Derivative assets £m | Minimum    
Disclosure of detailed information about financial instruments [line items]    
Significant unobservable input, assets 0.08 0.08