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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2020
Text block [abstract]  
Summary of Cash and Cash Equivalents in the Statement of Cash Flows
   
2020
$m
   2019
$m		 
Cash at bank and in hand
  
 
104
 
   160 
  
 
 
   
 
 
 
Short-term deposits
  
 
358
 
   —   
  
 
 
   
 
 
 
Money market funds
  
 
892
 
   35 
  
 
 
   
 
 
 
Repurchase agreements
  
 
321
 
   —   
  
 
 
   
 
 
 
Cash and cash equivalents as recorded in the Group statement of financial position
  
 
1,675
 
   195 
  
 
 
   
 
 
 
Bank overdrafts (note 22)
  
 
(51
) 
   (87) 
  
 
 
   
 
 
 
Cash and cash equivalents as recorded in the Group statement of cash flows
  
 
1,624
 
   108