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Related parties (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Related party transactions    
Cash ratio deposits   0.368%
Threshold eligible liabilities   £ 600
Associate    
Related party transactions    
Investment extended to ownership voting rights (as a percentage)   20.00%
RBSG plc | HM Treasury    
Related party transactions    
Percentage of ownership interest 61.90%