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Financial instruments - valuation - Movement in Level 3 portfolios - Assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Trading assets    
Movement in level 3 assets    
Financial assets £ 48,917 £ 45,551
Derivatives    
Movement in level 3 assets    
Financial assets 78,406 78,904
Recurring fair value measurement    
Movement in level 3 assets    
Financial assets at beginning of period 153,862  
Financial assets at end of period 165,969 153,862
Recurring fair value measurement | Level 3    
Movement in level 3 assets    
Financial assets at beginning of period 1,961 2,333
Amounts recorded in the income statement (127) (243)
Amount recorded in the statement of comprehensive income 13 32
Level 3 transfers in (64) (37)
Level 3 transfers out (263) (227)
Purchases/Originations 382 463
Settlements/Other decreases (89) (164)
Sales (250) (254)
Foreign exchange and other adjustments (9) (16)
Financial assets at end of period 1,682 1,961
Amounts recorded in the income statement in respect of balances held at period end - unrealised   29
Recurring fair value measurement | Level 3 | Derivatives    
Movement in level 3 assets    
Financial assets at beginning of period 823 1,007
Amounts recorded in the income statement (122) (156)
Level 3 transfers in (7) (6)
Level 3 transfers out (3) (5)
Purchases/Originations 147 180
Settlements/Other decreases (44) (70)
Sales (178) (137)
Foreign exchange and other adjustments   (2)
Financial assets at end of period 630 823
Amounts recorded in the income statement in respect of balances held at period end - unrealised 83 67
Recurring fair value measurement | Level 3 | Other trading assets    
Movement in level 3 assets    
Financial assets at beginning of period 223 396
Amounts recorded in the income statement (17) (88)
Level 3 transfers in (1) (15)
Level 3 transfers out (19) (32)
Purchases/Originations 118 8
Settlements/Other decreases (27) (8)
Sales   (65)
Foreign exchange and other adjustments (1) (3)
Financial assets at end of period 278 223
Amounts recorded in the income statement in respect of balances held at period end - unrealised 1 (39)
Recurring fair value measurement | Level 3 | Other financial assets    
Movement in level 3 assets    
Financial assets at beginning of period 915 930
Amounts recorded in the income statement 12 1
Amount recorded in the statement of comprehensive income 13 32
Level 3 transfers in (56) (16)
Level 3 transfers out (241) (190)
Purchases/Originations 117 275
Settlements/Other decreases (18) (86)
Sales (72) (52)
Foreign exchange and other adjustments (8) (11)
Financial assets at end of period 774 915
Amounts recorded in the income statement in respect of balances held at period end - unrealised 12 £ 1
Recurring fair value measurement | Level 3 | Financial assets    
Movement in level 3 assets    
Amounts recorded in the income statement in respect of balances held at period end - unrealised £ 96