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Management representation (Details)
£ in Millions, $ in Millions
Dec. 31, 2021
GBP (£)
Oct. 31, 2021
GBP (£)
Oct. 31, 2021
USD ($)
Oct. 30, 2021
USD ($)
Sep. 30, 2021
GBP (£)
Aug. 02, 2021
GBP (£)
Subsequent Event            
Short-term Debt [Line Items]            
Escrow deposit | $     $ 2,487 $ 2,272    
Subsequent Event | Foreign Exchange Forward | Forecast            
Short-term Debt [Line Items]            
Notional amount of derivative £ 6,415          
Commercial Paper | Subsequent Event            
Short-term Debt [Line Items]            
Short-term debt | $     $ 2,126      
Bridge Loan | Line of Credit | Bridge Credit Agreement            
Short-term Debt [Line Items]            
Aggregate principal amount         £ 5,100 £ 6,524
Bridge Loan | Subsequent Event | Line of Credit | Bridge Credit Agreement            
Short-term Debt [Line Items]            
Aggregate principal amount   £ 3,200