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IMPAIRMENT (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of impairment loss and reversal of impairment loss [text block] [Abstract]  
Disclosure of impairment [text block]
   Stage 1
£m
   Stage 2
£m
   Stage 3
£m
   Purchased or
originated
credit-impaired
£m
   Total
£m
 
Year ended 31 December 2018                         
Impact of transfers between stages   (12)   51    446        485 
Other changes in credit quality   (20)   (47)   541    69    543 
Additions (repayments)   18    (82)   43    (69)   (90)
Methodology changes   (71)   (21)   72        (20)
Other items   (13)       32        19 
Other items impacting the impairment charge   (86)   (150)   688        452 
Total impairment   (98)   (99)   1,134        937 
                          
In respect of:                         
Loans and advances to banks   1                1 
Loans and advances to customers   (66)   (51)   1,139        1,022 
Debt securities                    
Financial assets at amortised cost   (65)   (51)   1,139        1,023 
Other assets           1        1 
Impairment charge on drawn balances   (65)   (51)   1,140        1,024 
Loan commitments and financial guarantees   (19)   (48)   (6)       (73)
Financial assets at fair value through other comprehensive income   (14)               (14)
Total impairment   (98)   (99)   1,134        937 
Disclosure of Impairment Loss and Reversal of Impairment Loss [text block]
   2017
£m
   2016
£m
 
Impairment losses on loans and receivables:          
Loans and advances to customers   697    592 
Debt securities classified as loans and receivables   (6)    
Total impairment losses on loans and receivables   691    592 
Impairment of available-for-sale financial assets   6    173 
Other credit risk provisions   (9)   (13)
Total impairment charged to the income statement   688    752