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Asset transfers - Transferred assets continue to be recorded on Natwest Group's balance sheet (Details) - GBP (£)
£ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Assets £ 781,992 £ 799,491 £ 723,039
Mortgages - RoI      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Total 1,314 2,091  
Debt securities in issue      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Assets 1,286 2,067  
Debt securities in issue | Mortgages - RoI      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Assets 1,244 1,921  
Debt securities in issue | Cash deposits      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Assets 42 146  
Debt securities in issue held by third parties | Mortgages - RoI      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Assets   243  
Debt securities in issue held by the Group | Mortgages - RoI      
Disclosure of transferred financial assets that are not derecognised in their entirety [line items]      
Assets £ 1,314 £ 1,848