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Working capital - Narrative (Details) - GBP (£)
£ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Summary of additional information about working capital [line items]        
Trade receivables £ 1,498 £ 1,817 £ 1,498  
Income statement (income)/charge   (15) 55 £ 23
Interest on borrowings 148 122 148  
Accrued Discounts Related To Sales Recognized 359 455 359  
Current contract liabilities 56 79 56  
Supply chain financing facilities accounted as trade payables (309) (465) (309)  
Provision For Employee Deferred Compensation Plan 47 45 47  
Provisions £ 476 £ 412 476  
Terms of Raising the Bar programme 2 years      
Other        
Summary of additional information about working capital [line items]        
Description of expected timing of outflows commitments to UK Thalidomide Trust   These provisions will be utilised over the period of the commitments up to 2037.    
Provisions £ 277 £ 222 277  
United Kingdom        
Summary of additional information about working capital [line items]        
Trade receivables due from counterparties   15.00%    
United States        
Summary of additional information about working capital [line items]        
Trade receivables due from counterparties   28.00%    
India        
Summary of additional information about working capital [line items]        
Trade receivables due from counterparties   9.00%    
Non-current liabilities | Fair value        
Summary of additional information about working capital [line items]        
Non-current contingent liabilities (156) £ (320) (156)  
COVID-19        
Summary of additional information about working capital [line items]        
Income statement (income)/charge   29    
COVID-19 | Raising the Bar programme | Other        
Summary of additional information about working capital [line items]        
Provisions £ 81 33 81  
COVID-19 | Obsolete inventories        
Summary of additional information about working capital [line items]        
Inventory provision charged released to profit and loss   £ 4 £ 23