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SHARE CAPITAL (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of issued capital [text block] [Abstract]  
Disclosure of classes of share capital [text block]
   2018
Number of shares
   2017
Number of shares
   2016
Number of shares
   2018
£m
   2017
£m
   2016
£m
 
Ordinary shares of 10p (formerly 25p) each                              
At 1 January   71,972,949,589    71,373,735,357    71,373,735,357    7,197    7,138    7,138 
Issued under employee share schemes   768,551,098    518,293,181        77    51     
Share buy-back programme (note 41)   (1,577,908,423)           (158)        
Redesignation of limited voting ordinary shares (see below)       80,921,051            8     
At 31 December   71,163,592,264    71,972,949,589    71,373,735,357    7,116    7,197    7,138 
Limited voting ordinary shares of 10p (formerly 25p) each                              
At 1 January       80,921,051    80,921,051        8    8 
Redesignation to ordinary shares (see below)       (80,921,051)           (8)    
At 31 December           80,921,051            8 
Total issued share capital                  7,116    7,197    7,146