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SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES - Narratives (Details)
£ / shares in Units, £ in Millions
Jun. 30, 2023
GBP (£)
Vote / shares
£ / shares
shares
Dec. 31, 2022
GBP (£)
£ / shares
shares
Jun. 30, 2022
GBP (£)
£ / shares
shares
Dec. 31, 2021
GBP (£)
Disclosure of classes of share capital [line items]        
Equity £ 16,567 £ 16,457 £ 26,999 £ 26,480
Share capital 92 92    
Share capital        
Disclosure of classes of share capital [line items]        
Equity 92 92 1 £ 1
Share premium        
Disclosure of classes of share capital [line items]        
Equity     70  
Ordinary shares        
Disclosure of classes of share capital [line items]        
Share capital £ 92 £ 92 £ 1  
Number of shares outstanding | shares 9,234,573,831 9,234,573,831 1,000,000  
Par value per share | £ / shares £ 0.01 £ 0.01 £ 1.00  
Votes per share | Vote / shares 1