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Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Equipment
Equipment consists of office equipment, software, furniture and fittings. Changes in equipment balances for the periods presented in this report were as follows:
 (In $ millions)
 
 
Cost

 
Accumulated depreciation

 
Net book value

Opening balance as at January 1, 2018 (Predecessor)
 
 
84

 
(55
)
 
29

Additions
 
 
9

 
—

 
9

Depreciation
 
 
—

 
(3
)
 
(3
)
Closing balance as at July 1, 2018 (Predecessor)
 
 
93

 
(58
)
 
35

Fresh Start adjustments
 
 
(64
)
 
58

 
(6
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Opening balance as at July 2, 2018 (Successor)
 
 
29

 
—

 
29

Additions
 
 
5

 
—

 
5

Depreciation
 
 
—

 
(5
)
 
(5
)
Closing balance as at December 31, 2018 (Successor)
 
 
34

 
(5
)
 
29

Additions
 
 
4

 
—

 
4

Depreciation
 
 
—

 
(10
)
 
(10
)
Closing balance as at December 31, 2019 (Successor)
 
 
38

 
(15
)
 
23