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Contingent liabilities, commitments and guarantees (Details) - GBP (£)
£ in Millions
 1 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2020
LIBOR and other trading rates    
CONTINGENT LIABILITIES AND COMMITMENTS (Details) [Line Items]    
Settlements reached £ 217  
Tax contingent liability    
CONTINGENT LIABILITIES AND COMMITMENTS (Details) [Line Items]    
Increase (decrease) in current tax liabilities   £ 805
Increase (decrease) in deferred tax liability (asset)   £ 270