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FINANCIAL ASSETS AT FAIR VALUE THROUGH OTHER COMPREHENSIVE INCOME (Tables)
12 Months Ended
Dec. 31, 2018
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]
   31 December
2018
£m
   1 January
2018
£m
 
Debt securities:          
Government securities   18,971    34,708 
Bank and building society certificates of deposit   118    167 
Asset-backed securities:          
Mortgage-backed securities   120    2,381 
Other asset-backed securities   131    467 
Corporate and other debt securities   5,151    4,615 
    24,491    42,338 
Treasury and other bills   303     
Equity shares   21    579 
Total financial assets at fair value through other comprehensive income   24,815    42,917