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Financial instruments - valuation - Movement in Level 3 portfolios - Assets (Details) - At fair value - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Movement in level 3 assets    
Financial assets at beginning of period £ 165,969  
Financial assets at end of period 173,504  
Level 3    
Movement in level 3 assets    
Financial assets at beginning of period 1,682 £ 1,961
Amounts recorded in the income statement (64) (63)
Amount recorded in the statement of comprehensive income 11 (13)
Level 3 transfers in 40 7
Level 3 transfers out (22) (274)
Purchases/Originations 218 130
Settlements/Other decreases (33) (45)
Sales (253) (42)
Foreign exchange and other adjustments (4) (5)
Financial assets at end of period 1,583 1,656
Amounts recorded in the income statement in respect of balances held at period end - unrealised 55 120
Level 3 | Derivatives    
Movement in level 3 assets    
Financial assets at beginning of period 630 823
Amounts recorded in the income statement (65) (70)
Level 3 transfers in 40 7
Level 3 transfers out (6) (2)
Purchases/Originations 70 82
Settlements/Other decreases (2) (38)
Sales (31) (40)
Foreign exchange and other adjustments (1)  
Financial assets at end of period 637 762
Amounts recorded in the income statement in respect of balances held at period end - unrealised 57 116
Level 3 | Other trading assets    
Movement in level 3 assets    
Financial assets at beginning of period 278 223
Amounts recorded in the income statement 2 2
Level 3 transfers out   (14)
Purchases/Originations 89 25
Settlements/Other decreases (31) (7)
Sales (97)  
Foreign exchange and other adjustments (2) 1
Financial assets at end of period 243 230
Amounts recorded in the income statement in respect of balances held at period end - unrealised 1  
Level 3 | Other financial assets    
Movement in level 3 assets    
Financial assets at beginning of period 774 915
Amounts recorded in the income statement (1) 5
Amount recorded in the statement of comprehensive income 11 (13)
Level 3 transfers out (16) (258)
Purchases/Originations 59 23
Sales (125) (2)
Foreign exchange and other adjustments (1) (6)
Financial assets at end of period 703 664
Amounts recorded in the income statement in respect of balances held at period end - unrealised £ (3) £ 4