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EARNINGS PER SHARE (Tables)
12 Months Ended
Dec. 31, 2019
Retained earnings [member]  
EARNINGS PER SHARE (Tables) [Line Items]  
Disclosure of earnings per share [text block]
    2019    20181    20171 
    £m    £m    £m 
Profit attributable to equity shareholders – basic and diluted   2,459    3,975    3,494 
    2019    2018    2017 
    million    million    million 
Weighted average number of ordinary shares in issue – basic   70,603    71,638    71,710 
Adjustment for share options and awards   682    641    683 
Weighted average number of ordinary shares in issue – diluted   71,285    72,279    72,393 
Basic earnings per share   3.5p   5.5p   4.9p
Diluted earnings per share   3.4p   5.5p   4.8p
1 Restated, see note 1.