v3.26.1
Fair values of financial assets and liabilities - Schedule of Financial Assets Carried at Fair Value by Valuation Hierarchy (Details) - GBP (£)
£ in Millions
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Disclosure of fair value measurement of assets [line items]      
Loans and advances to banks £ 8,138 £ 7,236  
Loans and advances to customers 491,678 481,463 £ 471,598
Reverse repurchase agreements 54,351 50,986  
Debt securities 16,635 13,987  
Financial assets at fair value through profit or loss 258,373 240,413  
Total financial assets at fair value through other comprehensive income 40,428 36,320  
Derivative financial instruments 20,731 19,727  
Total financial assets carried at fair value 319,532 296,460  
Insurance contracts      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss, mandatorily measured at fair value 224,952 209,545  
Level 1      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss 180,543 163,671  
Total financial assets at fair value through other comprehensive income 25,363 24,151  
Derivative financial instruments 105 57  
Total financial assets carried at fair value 206,011 187,879  
Level 2      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss 67,960 66,491  
Total financial assets at fair value through other comprehensive income 14,964 12,068  
Derivative financial instruments 20,145 19,206  
Total financial assets carried at fair value 103,069 97,765  
Level 3      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss 9,870 10,251  
Total financial assets at fair value through other comprehensive income 101 101  
Derivative financial instruments 481 464  
Total financial assets carried at fair value 10,452 10,816  
Financial assets at fair value through profit or loss      
Disclosure of fair value measurement of assets [line items]      
Loans and advances to banks 3,915 2,851  
Loans and advances to customers 8,259 9,001  
Reverse repurchase agreements 21,006 20,981  
Debt securities 58,555 53,802  
Treasury and other bills 4 11  
Contracts held with reinsurers 8,013 8,168  
Equity shares 158,621 145,599  
Financial assets at fair value through profit or loss | Level 1      
Disclosure of fair value measurement of assets [line items]      
Loans and advances to banks 0 0  
Loans and advances to customers 0 0  
Reverse repurchase agreements 0 0  
Debt securities 23,171 19,496  
Treasury and other bills 4 11  
Contracts held with reinsurers 0 0  
Equity shares 157,368 144,164  
Financial assets at fair value through profit or loss | Level 2      
Disclosure of fair value measurement of assets [line items]      
Loans and advances to banks 3,915 2,851  
Loans and advances to customers 2,346 2,943  
Reverse repurchase agreements 21,006 20,981  
Debt securities 32,680 31,548  
Treasury and other bills 0 0  
Contracts held with reinsurers 8,013 8,168  
Equity shares 0 0  
Financial assets at fair value through profit or loss | Level 3      
Disclosure of fair value measurement of assets [line items]      
Loans and advances to banks 0 0  
Loans and advances to customers 5,913 6,058  
Reverse repurchase agreements 0 0  
Debt securities 2,704 2,758  
Treasury and other bills 0 0  
Contracts held with reinsurers 0 0  
Equity shares 1,253 1,435  
Financial assets at fair value through other comprehensive income      
Disclosure of fair value measurement of assets [line items]      
Debt securities 40,376 36,269  
Equity shares 52 51  
Financial assets at fair value through other comprehensive income | Level 1      
Disclosure of fair value measurement of assets [line items]      
Debt securities 25,363 24,151  
Equity shares 0 0  
Financial assets at fair value through other comprehensive income | Level 2      
Disclosure of fair value measurement of assets [line items]      
Debt securities 14,964 12,068  
Equity shares 0 0  
Financial assets at fair value through other comprehensive income | Level 3      
Disclosure of fair value measurement of assets [line items]      
Debt securities 49 50  
Equity shares £ 52 £ 51