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CRITICAL ACCOUNTING JUDGEMENTS AND ESTIMATES (Details) - Schedule of Expected Credit Loss Relating to Unemployment - GBP (£)
£ in Millions
Dec. 31, 2019
Dec. 31, 2018
Unemployment Increase 1pp [Member]    
CRITICAL ACCOUNTING JUDGEMENTS AND ESTIMATES (Details) - Schedule of Expected Credit Loss Relating to Unemployment [Line Items]    
ECL impact, £m £ 141 £ 172
Unemployment Decrease 1pp [Member]    
CRITICAL ACCOUNTING JUDGEMENTS AND ESTIMATES (Details) - Schedule of Expected Credit Loss Relating to Unemployment [Line Items]    
ECL impact, £m £ (143) £ (155)