v3.25.2
Fair values of financial instruments carried at fair value - Quantitative information about significant unobservable inputs in Level 3 valuations (Details) - Recurring fair value measurements
£ in Millions
Jun. 30, 2025
GBP (£)
Dec. 31, 2024
GBP (£)
Private equity including strategic investments | Minimum | Current Value/Cost | Price - Net asset value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0 0
Private equity including strategic investments | Maximum | Current Value/Cost | Price - Net asset value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 9 9
– equity-linked notes (one) | Minimum | Equity volatility | Model-Option model    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.06 0.09
– equity-linked notes (one) | Maximum | Equity volatility | Model-Option model    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.57 0.49
– equity-linked notes (two) | Minimum | Equity correlation | Model-Option model    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.21 0.15
– equity-linked notes (two) | Maximum | Equity correlation | Model-Option model    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 1 1
– FX-linked notes | Minimum | FX volatility | Model-Option model    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.05 0.03
– FX-linked notes | Maximum | FX volatility | Model-Option model    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.11 0.17
– securitisation swaps | Minimum | Constant Prepayment rate | Model-Discounted cash flow | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.05 0.05
– securitisation swaps | Maximum | Constant Prepayment rate | Model-Discounted cash flow | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.10 0.10
– long-dated swaptions | Minimum | IR volatility | Model-Option model | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.09 0.09
– long-dated swaptions | Maximum | IR volatility | Model-Option model | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.21 0.21
– FX options | Minimum | FX volatility | Model-Option model | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.01 0.01
– FX options | Maximum | FX volatility | Model-Option model | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.18 0.26
– long-dated single stock options | Minimum | Equity volatility | Model-Option model | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.07 0.07
– long-dated single stock options | Maximum | Equity volatility | Model-Option model | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 1.19 0.66
– total return swaps | Minimum | Price | Market proxy | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 73 0
– total return swaps | Maximum | Price | Market proxy | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 106 104
– bonds | Minimum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0 0
– bonds | Maximum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 106 105
– repurchase agreements | Minimum | IR volatility | Model-Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0 0
– repurchase agreements | Maximum | IR volatility | Model-Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, liabilities, percentage 0.03 0.26
Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 6,091 £ 7,613
Financial liabilities 5,847 5,941
Level 3 | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 750  
Financial liabilities 814  
Level 3 | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 403  
Financial liabilities 360  
Level 3 | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 919  
Financial liabilities 1,128  
Level 3 | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 180  
Financial liabilities 470  
Level 3 | Other risk    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 17  
Financial liabilities 3  
Level 3 | Private equity including strategic investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 1  
Level 3 | Asset-backed securities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 0 0
Level 3 | CLO/CDO    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 0  
Level 3 | – other ABSs    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 0  
Level 3 | Structured notes    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 3,036 2,958
Level 3 | – equity-linked notes (one)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 2,582  
Level 3 | – equity-linked notes (two)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities  
Level 3 | – FX-linked notes    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 49  
Level 3 | – other    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 405  
Level 3 | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 2,775  
Level 3 | – securitisation swaps | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 237  
Level 3 | – long-dated swaptions | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 66  
Level 3 | – other | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 511  
Level 3 | – other | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 136  
Level 3 | – other | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 795  
Level 3 | – other | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 85  
Level 3 | – FX options | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 224  
Level 3 | – long-dated single stock options | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 333  
Level 3 | – total return swaps | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 385  
Level 3 | Other portfolios    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 35 £ 627
Level 3 | – bonds    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 28  
Level 3 | – repurchase agreements    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 0  
Level 3 | – loans & deposit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities 0  
Level 3 | – other    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial liabilities £ 7  
Private equity including strategic investments | Minimum | Current Value/Cost | Price - Net asset value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0 0
Private equity including strategic investments | Maximum | Current Value/Cost | Price - Net asset value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 9 9
Private equity including strategic investments | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 1,206 £ 1,178
Asset-backed securities | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 169 £ 213
CLO/CDO | Minimum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0 0
CLO/CDO | Maximum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 100 97
CLO/CDO | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 70  
– other ABSs | Minimum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0 0
– other ABSs | Maximum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 255 248
– other ABSs | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 99  
Structured notes | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0 £ 0
– equity-linked notes (one) | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0  
– equity-linked notes (two) | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets  
– FX-linked notes | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0  
– other | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 0  
Derivatives | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 2,269  
– securitisation swaps | Minimum | Constant Prepayment rate | Model-Discounted cash flow | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.05 0.05
– securitisation swaps | Maximum | Constant Prepayment rate | Model-Discounted cash flow | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.10 0.10
– securitisation swaps | Level 3 | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 104  
– long-dated swaptions | Minimum | IR volatility | Model-Option model | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.09 0.09
– long-dated swaptions | Maximum | IR volatility | Model-Option model | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.21 0.21
– long-dated swaptions | Level 3 | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 65  
– other | Level 3 | Interest rate (‘IR’)    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 581  
– other | Level 3 | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 145  
– other | Level 3 | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets 613  
– other | Level 3 | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 25  
– FX options | Minimum | FX volatility | Model-Option model | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.01 0.01
– FX options | Maximum | FX volatility | Model-Option model | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.18 0.26
– FX options | Level 3 | Foreign exchange    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 258  
– long-dated single stock options | Minimum | Equity volatility | Model-Option model | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.07 0.07
– long-dated single stock options | Maximum | Equity volatility | Model-Option model | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 1.19 0.66
– long-dated single stock options | Level 3 | Equities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 306  
– total return swaps | Minimum | Price | Market proxy | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 73 0
– total return swaps | Maximum | Price | Market proxy | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 106 104
– total return swaps | Level 3 | Credit    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 155  
Other portfolios: | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 2,447  
– bonds | Minimum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0 0
– bonds | Maximum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 106 105
– bonds | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 1,544  
– repurchase agreements | Minimum | IR volatility | Model-Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0 0
– repurchase agreements | Maximum | IR volatility | Model-Discounted cash flow    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0.03 0.26
– repurchase agreements | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 263  
– loans & deposit | Minimum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 0  
– loans & deposit | Maximum | Price | Market proxy    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Significant unobservable input, assets, percentage 102  
– loans & deposit | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 501  
– other | Level 3    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Financial assets £ 139