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Debt (Details)
£ in Millions
3 Months Ended
Aug. 27, 2021
USD ($)
Aug. 02, 2021
GBP (£)
Sep. 30, 2021
GBP (£)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Line of Credit Facility [Line Items]          
Commercial paper       $ 0 $ 0
Debt to debt-shareholders' equity ratio     0.44    
Maximum          
Line of Credit Facility [Line Items]          
Debt to debt-shareholders' equity ratio, covenant, maximum     0.65    
Multi-Currency Credit Agreement | Line of Credit          
Line of Credit Facility [Line Items]          
Aggregate principal amount       3,000,000,000  
Line of Credit | Bridge Credit Agreement | Bridge Loan          
Line of Credit Facility [Line Items]          
Aggregate principal amount | £   £ 6,524 £ 5,100    
Expiration period   364 days      
Financing fee       $ 39,000,000  
Line of Credit | Term Loan Facility | Senior Notes          
Line of Credit Facility [Line Items]          
Aggregate principal amount $ 2,000,000,000        
Debt term 3 years