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LIABILITIES ARISING FROM NON-PARTICIPATING INVESTMENT CONTRACTS (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure of investment contracts liabilities [text block] [Abstract]  
Disclosure of investment contract liabilities explanatory
   2019   2018 
   £m   £m 
At 1 January   13,853    15,447 
Acquisition of business (note 23)   20,981     
New business   1,810    668 
Changes in existing business   815    (2,262)
At 31 December   37,459    13,853