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Taxation (Details) - GBP (£)
£ in Millions
6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of geographical areas [line items]    
Taxation charge £ 530 £ 560
UK    
Disclosure of geographical areas [line items]    
Taxation charge 133 134
Foreign    
Disclosure of geographical areas [line items]    
Taxation charge £ 397 £ 426