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Tax - Tax losses (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Unused tax losses    
Deferred tax asset £ 1,195 £ 901
Total losses carried forward    
Unused tax losses    
Deferred tax asset 899 905
Total losses carried forward | National Westminster Bank Plc    
Unused tax losses    
Deferred tax asset   592
Total losses carried forward | UK    
Unused tax losses    
Deferred tax asset 840 862
Total losses carried forward | UK | NatWest Markets Plc    
Unused tax losses    
Deferred tax asset 56 62
Total losses carried forward | UK | National Westminster Bank Plc    
Unused tax losses    
Deferred tax asset 608 592
Total losses carried forward | UK | RBS plc    
Unused tax losses    
Deferred tax asset 176 200
Total losses carried forward | UK | Ulster Bank    
Unused tax losses    
Deferred tax asset   8
Total losses carried forward | Ireland | UBIDAC    
Unused tax losses    
Deferred tax asset 11 £ 43
Total losses carried forward | Ireland | NWM N.V.    
Unused tax losses    
Deferred tax asset £ 48