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LIABILITIES ARISING FROM NON-PARTICIPATING INVESTMENT CONTRACTS (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of investment contracts liabilities [text block] [Abstract]  
Disclosure of investment contract liabilities explanatory
   2017   2016 
   £m   £m 
At 1 January   20,112    22,777 
New business   608    560 
Changes in existing business   (5,273)   (3,225)
At 31 December   15,447    20,112