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Dividends on ordinary shares - Schedule of Dividends On Ordinary Shares (Details) - GBP (£)
£ / shares in Units, £ in Millions
6 Months Ended
May 21, 2019
Jun. 30, 2019
Jun. 30, 2018
Interim dividend [Member]      
Recommended by directors at previous year end:      
Dividend (per share)   £ 0.0112 £ 0.0107
Interim dividend   £ 789 £ 765
Final dividend [Member]      
Recommended by directors at previous year end:      
Dividend (per share) £ 0.0214    
Dividend £ 1,523