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Basis of Preparation and Accounting Policies (Details)
€ in Millions, $ in Millions
 6 Months Ended
Jul. 21, 2021
USD ($)
Jun. 30, 2021
USD ($)
item
Jun. 30, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Application of new accounting standards          
Number of hedge relationship instruments effected with LIBOR | item   1      
Borrowings   $ 27,495.0   $ 20,380.0  
Going concern          
Financial resources   19,700.0      
Cash and cash equivalents   15,567.0   7,832.0 $ 5,673.0
Undrawn committed bank facilities $ 9,500.0 4,100.0      
Borrowings cancelled 4,500.0        
Alexion Pharmaceuticals, Inc.          
Application of new accounting standards          
Borrowings 4,000.0 8,000.0      
Going concern          
Undrawn committed bank facilities       $ 9,500.0  
Loans paid off 2,300.0        
Cash and cash equivalents acquired 1,700.0        
Oustanding bank borrowings acquired 0.0        
Consideration paid 13,300.0        
Years 2 and 3          
Going concern          
Undrawn committed bank facilities   3,400.0      
Loans drawn 2,000.0        
Years 1 and 2          
Going concern          
Undrawn committed bank facilities 1,000.0 $ 700.0      
Extension option (in years)   1 year      
Loans drawn $ 2,000.0        
Due within one year          
Going concern          
Short-term borrowings   $ 2,900.0      
0.875% Non-callable bond          
Application of new accounting standards          
Borrowings | €     € 750    
Interest rate on borrowings   0.875% 0.875%    
Instruments in a fair value hedge relationship | 0.875% Non-callable bond          
Application of new accounting standards          
Borrowings covered by hedges | €     € 300    
Interest rate swaps | Instruments in a fair value hedge relationship | Group's EUR denominated net assets          
Application of new accounting standards          
Nominal amounts in local currency | €     300