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Tax - Other (Details) - GBP (£)
£ in Millions
 12 Months Ended
Apr. 01, 2023
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax:        
Deferred tax asset   £ 1,195 £ 901  
Deferred tax liabilities   £ 359 £ 291  
UK corporation tax   19.00% 19.00% 19.00%
Deferred tax expense (income) recognised in profit or loss   £ (9) £ (31)  
Deferred tax expense (income) recognised in other comprehensive income   (224) 163  
UK tax rate change impact   (165) (75)  
Deferred tax assets that have not been recognised   5,437 4,965 £ 4,653
Tax losses and other temporary differences for which no deferred tax asset has been recognised   24,699 25,091 23,555
Deferred tax liabilities not recognised   302 242 262
Expected future taxation from unrecognised deferred tax liabilities   0    
Temporary differences associated with investments in subsidiaries and branches   1,032 1,021 1,074
Underlying temporary differences in respect of retained earnings of overseas subsidiaries and held-over gains on the incorporation of certain overseas branches   1,032 1,021 £ 1,074
Forecast        
Deferred tax:        
UK corporation tax 25.00%      
within 5 years        
Deferred tax:        
Tax losses and other temporary differences for which no deferred tax asset has been recognised   77    
After 5 years        
Deferred tax:        
Tax losses and other temporary differences for which no deferred tax asset has been recognised   4,288    
Total losses carried forward        
Deferred tax:        
Deferred tax asset   899 905  
Deferred tax expense (income) recognised in profit or loss   £ (1) 46  
Country of domicile        
Deferred tax:        
Limit of offset of losses carried forward (as a percent)   25.00%    
Banking surcharge rate   8.00%    
UK corporation tax   19.00%    
Country of domicile | Forecast        
Deferred tax:        
Banking surcharge rate 3.00%      
UK corporation tax 25.00%      
Country of domicile | Total losses carried forward        
Deferred tax:        
Deferred tax asset   £ 840 862  
Country of domicile | Effect of future tax rate change on recognised deferred tax [Member]        
Deferred tax:        
Increase (decrease) in deferred tax liability (asset)   (163)    
Deferred tax expense (income) recognised in profit or loss   (165)    
Deferred tax expense (income) recognised in other comprehensive income   2    
NatWest Markets Plc | Total losses carried forward        
Deferred tax:        
Deferred tax asset   56 62  
Increase (decrease) in deferred tax liability (asset)   13    
Tax losses carried forward   254    
NatWest Markets Plc | Effect of future tax rate change on recognised deferred tax [Member]        
Deferred tax:        
UK tax rate change impact   7    
National Westminster Bank Plc | Total losses carried forward        
Deferred tax:        
Deferred tax asset   608    
Tax losses carried forward   2,610    
RBS plc | Total losses carried forward        
Deferred tax:        
Deferred tax asset   176 200  
Tax losses carried forward   3,979    
Tax losses for which deferred tax assets are recognised   722    
UBIDAC        
Deferred tax:        
Increase (decrease) in deferred tax liability (asset)   32    
UBIDAC | Total losses carried forward        
Deferred tax:        
Deferred tax asset   11 £ 43  
Tax losses for which deferred tax assets are recognised   88    
NWM N.V. | Total losses carried forward        
Deferred tax:        
Deferred tax asset   48    
Tax losses carried forward   187    
NWM N.V. | Total tax credits carryforward        
Deferred tax:        
Tax losses carried forward   £ 2,785