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Financial instruments: valuation - Movement in Level 3 portfolios - Assets (Details) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Movement in level 3 assets      
Financial assets £ 690,338   £ 692,673
Trading assets      
Movement in level 3 assets      
Financial assets 45,974   45,551
Derivatives      
Movement in level 3 assets      
Financial assets 67,514   £ 78,904
At fair value      
Movement in level 3 assets      
Financial assets at beginning of period 153,862    
Financial assets at end of period 142,163    
At fair value | Level 3      
Movement in level 3 assets      
Financial assets at beginning of period 1,961 £ 2,333  
Amounts recorded in the income statement (63) (80)  
Amount recorded in the statement of comprehensive income (13) 12  
Level 3 transfers in (7) (68)  
Level 3 transfers out (274) (34)  
Purchases/Originations 130 160  
Settlements/Other decreases (45) (24)  
Sales (42) (175)  
Foreign exchange and other adjustments 5 (19)  
Financial assets at end of period 1,656 2,105  
Amounts recorded in the income statement in respect of balances held at period end - unrealised 120 (81)  
At fair value | Level 3 | Derivatives      
Movement in level 3 assets      
Financial assets at beginning of period 823 1,007  
Amounts recorded in the income statement (70) (52)  
Level 3 transfers in (7) (4)  
Level 3 transfers out (2) (2)  
Purchases/Originations 82 86  
Settlements/Other decreases (38) (20)  
Sales (40) (92)  
Foreign exchange and other adjustments   (1)  
Financial assets at end of period 762 930  
Amounts recorded in the income statement in respect of balances held at period end - unrealised 116 (52)  
At fair value | Level 3 | Other trading assets      
Movement in level 3 assets      
Financial assets at beginning of period 223 396  
Amounts recorded in the income statement 2 (28)  
Level 3 transfers out (14) (32)  
Purchases/Originations 25 6  
Settlements/Other decreases (7) (4)  
Sales   (58)  
Foreign exchange and other adjustments (1) (3)  
Financial assets at end of period 230 277  
Amounts recorded in the income statement in respect of balances held at period end - unrealised   (28)  
At fair value | Level 3 | Other financial assets      
Movement in level 3 assets      
Financial assets at beginning of period 915 930  
Amounts recorded in the income statement 5    
Amount recorded in the statement of comprehensive income (13) 12  
Level 3 transfers in   (72)  
Level 3 transfers out (258)    
Purchases/Originations 23 68  
Sales (2) (25)  
Foreign exchange and other adjustments 6 (15)  
Financial assets at end of period 664 898  
Amounts recorded in the income statement in respect of balances held at period end - unrealised £ 4 £ (1)