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VALUE OF IN-FORCE BUSINESS (Tables) - In-Force [Member]
 12 Months Ended
Dec. 31, 2019
VALUE OF IN-FORCE BUSINESS (Tables) [Line Items]  
Disclosure of range of yields and other key assumptions The table below shows the resulting range of yields and other key assumptions at 31 December:

   2019
%		   2018
%		 
Risk-free rate (value of in-force non-annuity business)1   0.00 to 3.90    0.00 to 4.05 
Risk-free rate (value of in-force annuity business)1   0.91 to 4.81    1.28 to 5.33 
Risk-free rate (financial options and guarantees)1   0.00 to 3.90    0.00 to 4.05 
Retail price inflation   3.11    3.43 
Expense inflation   3.41    3.75 
Disclosure Of Gross Value Of In-Force Business Asset Explanatory [Text Block] The gross value of in-force business asset in the consolidated balance sheet is as follows:

   2019
£m		   2018
£m		 
Acquired value of in-force non-participating investment contracts   247    271 
Value of in-force insurance and participating investment contracts   5,311    4,491 
Total value of in-force business   5,558    4,762 
           
Nonparticipating Life Insurance Contract [Member]  
VALUE OF IN-FORCE BUSINESS (Tables) [Line Items]  
Disclosure Of Movement Of Value In Force Explanatory [Text Block] The movement in the acquired value of in-force non-participating investment contracts over the year is as follows:

           
    2019
£m		    2018
£m		 
At 1 January   271    306 
Acquisition of business   6    5 
Amortisation (note 11)   (30)   (40)
At 31 December   247    271 
Participating Life Insurance Contract [Member]  
VALUE OF IN-FORCE BUSINESS (Tables) [Line Items]  
Disclosure Of Movement Of Value In Force Explanatory [Text Block] The movement in the value of in-force insurance and participating investment contracts over the year is as follows:

   2019
£m		   2018
£m		 
At 1 January   4,491    4,533 
Exchange and other adjustments   (5)   13 
Movements in the year:          
New business   696    675 
Existing business:          
Expected return   (274)   (304)
Experience variances   (43)   (122)
Assumption changes   102    (67)
Economic variance   344    (237)
Movement in the value of in-force business (note 9)   825    (55)
At 31 December   5,311    4,491