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Warrant liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
Text Block [Abstract]  
Summary of Change in Carrying Value of the Warrants
The carrying value of the warrants as at 31 December is as follows:
 
 
  
2021
 
 
  
Registered for
resale
 
  
In process

of registration
for resale
 
  
Total
 
(in $ millions)
  
$
 
  
$
 
  
$
 
Initial recognition
  
 
36
 
  
 
55
 
  
 
91
 
Change in fair value
  
 
(15
) 
  
 
(22
) 
  
 
(37
) 
As at 31 December 2021
  
 
21
 
  
 
33
 
  
 
54