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Tax - Other (Details) - GBP (£)
£ in Millions
 12 Months Ended
Apr. 01, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred tax        
Current tax expense related to Top-up tax   £ 20 £ 0  
Deferred tax asset   1,876 1,894  
Deferred tax liability   £ 99 £ 141  
UK corporation tax 25.00% 25.00% 23.50% 19.00%
Banking surcharge rate 3.00% 3.00%   8.00%
Tax losses and other temporary differences for which no deferred tax asset has been recognised   £ 23,238 £ 24,438 £ 25,742
Deferred tax assets that have not been recognised   4,960 5,168 5,534
Deferred tax liabilities not recognised   269 256 257
Underlying temporary differences in respect of retained earnings of overseas subsidiaries and held-over gains on the incorporation of certain overseas branches   1,241 1,005 £ 1,010
Expected future taxation from unrecognised deferred tax liabilities   0    
After 10 years        
Deferred tax        
Tax losses and other temporary differences for which no deferred tax asset has been recognised   4,535    
Total losses carried forward        
Deferred tax        
Deferred tax asset   £ 1,106 1,019  
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   £ 1,018 959  
NatWest Markets Plc | Total losses carried forward        
Deferred tax        
Deferred tax asset   0 0  
Tax losses and other temporary differences for which no deferred tax asset has been recognised   5,520    
National Westminster Bank Plc | Total losses carried forward        
Deferred tax        
Deferred tax asset   333 362  
Tax losses for which deferred tax assets are recognised   £ 1,333    
Expected recovery period of unused tax losses   7 years    
Tax losses carried forward   £ 2,195    
RBS plc | Total losses carried forward        
Deferred tax        
Deferred tax asset   685 597  
Tax losses for which deferred tax assets are recognised   £ 2,740    
Expected recovery period of unused tax losses   7 years    
Tax losses carried forward   £ 2,948    
UBIDAC | Total losses carried forward        
Deferred tax        
Deferred tax asset   5 5  
Tax losses for which deferred tax assets are recognised   40    
NWM N.V. | Total losses carried forward        
Deferred tax        
Deferred tax asset   83 £ 55  
Tax losses for which deferred tax assets are recognised   322    
Tax losses carried forward   £ 2,308