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Dividends on ordinary shares - Narrative (Details) - GBP (£)
£ / shares in Units, £ in Millions
6 Months Ended 12 Months Ended
May 25, 2021
Jun. 30, 2021
Dec. 31, 2020
DIVIDENDS ON ORDINARY SHARES (Details) [Line Items]      
Total dividends paid     £ 0
Interim dividend      
DIVIDENDS ON ORDINARY SHARES (Details) [Line Items]      
Dividends proposed or declared before financial statements authorised for issue (in GBP per share)   £ 0.0067  
Dividends proposed or declared before financial statements authorised for issue   £ 473  
Final dividend      
DIVIDENDS ON ORDINARY SHARES (Details) [Line Items]      
Total dividends paid £ 404    
Dividend per share (GBP per share) £ 0.0057