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Cash and cash equivalents (Tables)
12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Summary of Cash and Cash Equivalents in the Statement of Cash Flows
   
2019
$m
   2018
$m
 
Cash at bank and in hand
  
 
160
 
   202 
   
 
 
   
 
 
 
Short-term deposits
  
 
 
   158 
Money market funds
 
 
35
 
 
 
76
 
Repurchase agreements
  
 
 
   268 
Cash and cash equivalents as recorded in the
Group
statement of financial position
  
 
195
 
   704 
Bank overdrafts (note
22
)
  
 
(87
   (104
Cash and cash equivalents as recorded in the
Group
statement of cash flows
  
 
108
 
   600