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Leases - Movement in right-of-use assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jul. 01, 2019
Jun. 30, 2019
Disclosure of quantitative information about right-of-use assets [line items]        
At 30 June 2019       £ 230
Adoption of IFRS16     £ 236  
Beginning balance £ 577      
Exchange differences (39) £ (1)    
Additions 56 206    
Increase(Decrease) Through Transfer Right-Of-Use-Assets (67)      
Acquisitions 8      
Disposals   (2)    
Depreciation (92) (92)    
Ending balance 443 577    
Land and buildings        
Disclosure of quantitative information about right-of-use assets [line items]        
At 30 June 2019       2
Adoption of IFRS16     173  
Beginning balance 269      
Exchange differences (21) (3)    
Additions 33 150    
Increase(Decrease) Through Transfer Right-Of-Use-Assets (1)      
Acquisitions 8      
Disposals   (2)    
Depreciation (58) (51)    
Ending balance 230 269    
Plant and equipment        
Disclosure of quantitative information about right-of-use assets [line items]        
At 30 June 2019       228
Adoption of IFRS16     63  
Beginning balance 276      
Exchange differences (18) 2    
Additions 23 24    
Increase(Decrease) Through Transfer Right-Of-Use-Assets (63)      
Acquisitions 0      
Disposals   0    
Depreciation (34) (41)    
Ending balance 184 276    
Under construction        
Disclosure of quantitative information about right-of-use assets [line items]        
At 30 June 2019       £ 0
Adoption of IFRS16     £ 0  
Beginning balance 32      
Exchange differences 0 0    
Additions 0 32    
Increase(Decrease) Through Transfer Right-Of-Use-Assets (3)      
Acquisitions 0      
Disposals   0    
Depreciation 0 0    
Ending balance £ 29 £ 32