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Equipment (Tables)
 6 Months Ended
Jun. 30, 2019
Property, Plant and Equipment [Abstract]  
Equipment
The following table summarizes the movement for the six months ended June 30, 2018 (Predecessor):
 (In $ millions)
 
Cost

 
Accumulated depreciation

 
Net book value

As at January 1, 2018 (Predecessor)
 
84

 
(55
)
 
29

Additions
 
9

 
—

 
9

Depreciation
 
—

 
(3
)
 
(3
)
As at June 30, 2018 (Predecessor)
 
93

 
(58
)
 
35


The following table summarizes the movement for the six months ended June 30, 2019 (Successor):
 (In $ millions)
 
Cost

 
Accumulated depreciation

 
Net book value

As at January 1, 2019 (Successor)
 
34

 
(5
)
 
29

Additions
 
3

 
—

 
3

Depreciation
 
—

 
(5
)
 
(5
)
As at June 30, 2019 (Successor)
 
37

 
(10
)
 
27