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Debt (Details)
£ in Millions, $ in Millions
6 Months Ended
Aug. 27, 2021
USD ($)
Aug. 02, 2021
GBP (£)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Oct. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Line of Credit Facility [Line Items]            
Commercial paper       $ 1,899   $ 0
Debt to debt-shareholders' equity ratio     0.49      
Maximum            
Line of Credit Facility [Line Items]            
Debt to debt-shareholders' equity ratio, covenant, maximum     0.65      
Commercial Paper            
Line of Credit Facility [Line Items]            
Short-term debt         $ 2,126  
Multi-Currency Credit Agreement | Line of Credit            
Line of Credit Facility [Line Items]            
Aggregate principal amount       3,000    
Line of Credit | Bridge Credit Agreement | Bridge Loan            
Line of Credit Facility [Line Items]            
Aggregate principal amount | £   £ 6,524 £ 3,200      
Expiration period   364 days        
Financing fee       $ 49    
Line of Credit | Term Loan Facility | Senior Notes            
Line of Credit Facility [Line Items]            
Aggregate principal amount $ 2,000          
Debt term 3 years