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CUSTOMER DEPOSITS (Tables)
12 Months Ended
Dec. 31, 2017
Deposits from Customers [Member]  
CUSTOMER DEPOSITS (Tables) [Line Items]  
Disclosure Of Customer Deposits TextBlock
   2017   2016 
   £m   £m 
Non-interest bearing current accounts   70,444    61,804 
Interest bearing current accounts   95,889    90,978 
Savings and investment accounts   196,966    208,227 
Liabilities in respect of securities sold under repurchase agreements   2,638    2,462 
Other customer deposits   52,187    51,989 
Customer deposits   418,124    415,460