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Tax - Reconciliation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Apr. 01, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Tax        
UK corporation tax 25.00% 23.50% 19.00% 19.00%
Profit before tax [1]   £ 6,178 £ 5,132 £ 3,844 [2]
Expected tax charge   (1,452) (975) (766)
Losses and temporary differences in year where no deferred tax asset recognised   (56) (118) (51)
Foreign profits taxed at other rates   10 (62) (11)
Non deductible goodwill impairment       (16)
losses on disposals and write-downs   (63) (10) (55)
UK bank levy   (27) (20) (18)
regulatory and legal actions   (1) (7) (74)
other disallowable items   (57) (51) (28)
Foreign exchange recycling on UBIDAC capital reduction   114    
RPI-related uplift on index linked gilts   6 67  
other non-taxable items   20 29 73
Taxable foreign exchange movements   9 (19) 8
Unrecognised losses brought forward and utilised   27 6 10
Banking surcharge   (236) (447) (341)
Tax on paid-in equity   52 43 48
UK tax rate change impact     (10) 165
Adjustments in respect of prior years   (165) 32 48
Tax charge for the year   (1,434) (1,275) (996) [2]
Deferred tax assets   1,894 2,178  
Deferred tax liabilities   £ 141 £ 227  
Banking Surcharge Rate 3.00% 4.25% 8.00%  
Total losses carried forward        
Tax        
Deferred tax assets   £ 1,019 £ 952  
UK        
Tax        
Profit before tax   6,196 5,716 4,143
Net increase/(decrease) in the carrying value of deferred tax assets in respect of:   371 272 (9)
Benefit from group relief and loss relief claims at higher tax rates   69    
Republic of Ireland        
Tax        
Net increase/(decrease) in the carrying value of deferred tax assets in respect of:   (1) £ (5) (27)
Netherlands        
Tax        
Net increase/(decrease) in the carrying value of deferred tax assets in respect of:   £ 15   £ 48
[1] Comparative results have been re-presented from those previously published to reclassify certain operations as discontinued operations as described in Note 8 to the consolidated financial statements.
[2] Comparative results have been re-presented from those previously published to reclassify certain items as discontinued operations as described in Note 8 to the consolidated financial statements.