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FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME (Tables)
12 Months Ended
Dec. 31, 2019
Financial assets at fair value through profit or loss, classified as held for trading, category [member]  
FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME (Tables) [Line Items]  
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [text block]
   2019
£m
    2018
£m
 
Debt securities:           
Government securities   13,098     18,971 
Bank and building society certificates of deposit        118 
Asset-backed securities:           
Mortgage-backed securities   121     120 
Other asset-backed securities   60     131 
Corporate and other debt securities   11,051     5,151 
    24,330     24,491 
Treasury and other bills   535     303 
Equity shares   227     21 
Total financial assets at fair value through other comprehensive income   25,092     24,815