v3.26.1
Fair values of financial assets and liabilities - Schedule of Movements in Level 3 Financial Liabilities Portfolio (Details) - Level 3 - GBP (£)
£ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Financial liabilities at fair value through profit or loss    
Reconciliation of changes in fair value measurement, liabilities [abstract]    
Balance at beginning of period £ 17 £ 22
Exchange and other adjustments 0 0
Losses (gains) recognised in the income statement within other income 1 (2)
Additions 0 0
Redemptions (1) (2)
Balance at end of period 17 18
Losses (gains) recognised in the income statement, within other income, relating to the change in fair value of those liabilities held 1 (2)
Derivative financial liabilities    
Reconciliation of changes in fair value measurement, liabilities [abstract]    
Balance at beginning of period 224 422
Exchange and other adjustments (1) 6
Losses (gains) recognised in the income statement within other income (7) (134)
Additions 1 9
Redemptions (13) (16)
Balance at end of period 204 287
Losses (gains) recognised in the income statement, within other income, relating to the change in fair value of those liabilities held 10 (108)
Total financial liabilities carried at fair value £m    
Reconciliation of changes in fair value measurement, liabilities [abstract]    
Balance at beginning of period 241 444
Exchange and other adjustments (1) 6
Losses (gains) recognised in the income statement within other income (6) (136)
Additions 1 9
Redemptions (14) (18)
Balance at end of period 221 305
Losses (gains) recognised in the income statement, within other income, relating to the change in fair value of those liabilities held £ 11 £ (110)