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Tax - Other (Details) - GBP (£)
£ in Millions
 12 Months Ended
Apr. 01, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax        
Deferred tax asset   £ 1,894 £ 2,178  
Deferred tax liability   £ 141 £ 227  
Banking surcharge rate 3.00% 4.25% 8.00%  
UK corporation tax 25.00% 23.50% 19.00% 19.00%
Charge/(credit) to income statement   £ (62) £ (236)  
(Credit)/charge to other comprehensive income   258 (916)  
UK tax rate change impact     10 £ (165)
Deferred tax assets that have not been recognised   5,168 5,534 5,437
Tax losses and other temporary differences for which no deferred tax asset has been recognised   24,438 25,742 24,699
Deferred tax liabilities not recognised   256 257 302
Expected future taxation from unrecognised deferred tax liabilities   0    
Temporary differences associated with investments in subsidiaries and branches   1,005 1,010 1,032
Underlying temporary differences in respect of retained earnings of overseas subsidiaries and held-over gains on the incorporation of certain overseas branches   1,005 1,010 £ 1,032
within 5 years        
Deferred tax        
Tax losses and other temporary differences for which no deferred tax asset has been recognised   34    
After 5 years        
Deferred tax        
Tax losses and other temporary differences for which no deferred tax asset has been recognised   4,488    
Total losses carried forward        
Deferred tax        
Deferred tax asset   1,019 952  
Charge/(credit) to income statement   £ (67) (51)  
Country of domicile        
Deferred tax        
Limit of offset of losses carried forward (as a percent)   25.00%    
Country of domicile | Total losses carried forward        
Deferred tax        
Deferred tax asset   £ 959 900  
NatWest Markets Plc | Total losses carried forward        
Deferred tax        
Deferred tax asset   0 3  
Tax losses and other temporary differences for which no deferred tax asset has been recognised   5,558    
National Westminster Bank Plc | Total losses carried forward        
Deferred tax        
Deferred tax asset   362 445  
Tax losses carried forward   2,308    
Tax losses for which deferred tax assets are recognised   1,448    
RBS plc | Total losses carried forward        
Deferred tax        
Deferred tax asset   597 452  
Tax losses carried forward   3,297    
Tax losses for which deferred tax assets are recognised   2,388    
UBIDAC | Total losses carried forward        
Deferred tax        
Deferred tax asset   5 6  
Tax losses for which deferred tax assets are recognised   40    
NWM N.V. | Total losses carried forward        
Deferred tax        
Deferred tax asset   55 £ 46  
Tax losses carried forward   2,496    
Tax losses for which deferred tax assets are recognised   £ 213