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DIVIDENDS ON ORDINARY SHARES (Tables)
12 Months Ended
Dec. 31, 2019
Dividend award [Member]  
DIVIDENDS ON ORDINARY SHARES (Tables) [Line Items]  
Disclosure of Dividends On Ordinary Shares [Text Block] Dividends paid during the year were as follows:

   2019   2018   2017             
   pence   pence   pence   2019   2018   2017 
   per share   per share   per share   £m   £m   £m 
Recommended by directors at previous year end:                        
Final dividend   2.14    2.05    1.70    1,523    1,475    1,212 
Special dividend           0.50            356 
Interim dividend paid in the year   1.12    1.07    1.00    789    765    720 
    3.26    3.12    3.20    2,312    2,240    2,288