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IMPAIRMENT (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of impairment loss and reversal of impairment loss [text block] [Abstract]  
Schedule of Impairment [Text Block]
   2017
£m
   2016
£m
   2015
£m
 
Impairment losses on loans and receivables:               
Loans and advances to customers   697    592    443 
Debt securities classified as loans and receivables   (6)       (2)
Total impairment losses on loans and receivables (note 20)   691    592    441 
Impairment of available-for-sale financial assets   6    173    4 
Other credit risk provisions   (9)   (13)   (55)
Total impairment charged to the income statement   688    752    390