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FINANCIAL LIABILITIES AT FAIR VALUE THROUGH PROFIT OR LOSS (Tables)
12 Months Ended
Dec. 31, 2019
Financial liabilities at fair value through profit or loss, category [member]  
FINANCIAL LIABILITIES AT FAIR VALUE THROUGH PROFIT OR LOSS (Tables) [Line Items]  
Disclosure of financial instruments designated at fair value through profit or loss [text block]
   2019   2018 
   £m   £m 
Liabilities designated at fair value through profit or loss:            
Debt securities in issue   7,531    7,085 
Other       11 
    7,531    7,096 
Trading liabilities:          
Liabilities in respect of securities sold under repurchase agreements   11,048    21,595 
Other deposits   98    242 
Short positions in securities   2,809    1,614 
    13,955    23,451 
Financial liabilities at fair value through profit or loss   21,486    30,547