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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Summary of Cash and Cash Equivalents in the Statement of Cash Flows
 
         
            2021
$m
         
            2020
$m
  
Cash at bank and in hand
       
 
124
 
       
 
104
 
Short-term deposits
       
 
301
 
       
 
358
 
Money market funds
       
 
1,025
 
       
 
892
 
Repurchase agreements
       
 
–
 
       
 
321
 
Cash and cash equivalents as recorded in the Group statement of financial position
       
 
1,450
 
       
 
1,675
 
Bank overdrafts (note 22)
       
 
(59
) 
       
 
(51
) 
Cash and cash equivalents as recorded in the Group statement of cash flows
       
 
1,391
 
       
 
1,624