v3.25.4
Goodwill and other intangible assets - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Oct. 09, 2025
Dec. 31, 2025
Dec. 31, 2024
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Goodwill and other intangible assets   £ 8,593 £ 8,188
Life And Pensions      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Goodwill   £ 2,383 £ 2,121
Percentage of entity goodwill (in percent)   79.00% 77.00%
Credit Card Cash Generating Unit      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Goodwill   £ 302 £ 302
Percentage of entity goodwill (in percent)   10.00% 11.00%
Motor Business Cash Generating Unit      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Goodwill   £ 310 £ 310
Percentage of entity goodwill (in percent)   10.00% 11.00%
Schroders Personal Wealth Limited (SPW)      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Proportion of ownership interest in subsidiary 100.00%    
Schroders Personal Wealth Limited (SPW)      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Percentage of voting equity interests acquired 49.90%    
Goodwill arising on acquisition £ 262    
Goodwill £m      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Goodwill and other intangible assets   £ 3,010 £ 2,748
Scottish Widows      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Discount rate applied to cash flow projections (in percent)   11.00%  
Retail – UK Motor Finance      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Discount rate applied to cash flow projections (in percent)   14.00%  
Reduced growth rate used to extrapolate cash flow projections (in percent)   2.00%  
Reduction period   20 years  
Discount rates post tax   10.50%  
Growth rate used to extrapolate cash flow projections (in percent)   3.50%  
Cards      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Discount rate applied to cash flow projections (in percent)   14.00%  
Discount rates post tax   10.50%  
Growth rate used to extrapolate cash flow projections (in percent)   3.50%  
Brands £m      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Goodwill and other intangible assets   £ 384 385
Growth rate used to extrapolate cash flow projections (in percent)   3.50%  
Discount rate used in current estimate of value in use   10.50%  
Brands £m | Bank Of Scotland Plc      
OTHER INTANGIBLE ASSETS (Details) - Narrative [Line Items]      
Intangible assets   £ 380 £ 380