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Dividends on ordinary shares (Details) - GBP (£)
£ / shares in Units, £ in Millions
6 Months Ended
May 19, 2022
Jun. 30, 2022
Jun. 30, 2021
Interim dividend      
Dividends On Ordinary Shares [Line Items]      
Dividends proposed or declared before financial statements authorised for issue (in GBP per share)   £ 0.0080 £ 0.0067
Dividends proposed or declared before financial statements authorised for issue   £ 550 £ 473
Final dividend      
Dividends On Ordinary Shares [Line Items]      
Dividend per share (GBP per share) £ 0.0133    
Total dividends paid £ 930