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SHARE CAPITAL (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure of issued capital [text block] [Abstract]  
Disclosure of classes of share capital [text block]
   2019
Number of shares
   2018
Number of shares
   2017
Number of shares
   2019
£m
   2018
£m
   2017
£m
 
Ordinary shares of 10p (formerly 25p) each                          
At 1 January   71,163,592,264    71,972,949,589    71,373,735,357    7,116    7,197    7,138 
Issued under employee share schemes   775,882,951    768,551,098    518,293,181    78    77    51 
Share buyback programme (note 42)   (1,886,917,377)   (1,577,908,423)       (189)   (158)    
Redesignation of limited voting ordinary shares (see below)           80,921,051            8 
At 31 December   70,052,557,838    71,163,592,264    71,972,949,589    7,005    7,116    7,197 
Limited voting ordinary shares of 10p (formerly 25p) each                              
At 1 January           80,921,051            8 
Redesignation to ordinary shares           (80,921,051)           (8)
At 31 December                        
Total issued share capital                  7,005    7,116    7,197