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LIABILITIES ARISING FROM NON-PARTICIPATING INVESTMENT CONTRACTS (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of investment contracts liabilities [text block] [Abstract]  
Disclosure of investment contract liabilities explanatory
   2018
£m
   2017
£m
 
At 1 January   15,447    20,112 
New business   668    608 
Changes in existing business   (2,262)   (5,273)
At 31 December   13,853    15,447