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Newbuildings (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Newbuildings
Changes in drilling units for the periods presented in this report were as follows:
(In $ millions)



Opening balance as at January 1, 2018 (Predecessor)

248

Additions

1

Closing balance as at July 1, 2018 (Predecessor)

249

Fresh Start adjustments

(249
)
 
 
 
 
 
 
Balance as at July 2, 2018, December 31, 2018 and December 31, 2019 (Successor)
 
—

Changes in drilling units 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)
 
 
17,335

 
(4,119
)
 
13,216

Additions
 
 
117

 
—

 
117

Depreciation
 
 
—

 
(388
)
 
(388
)
Impairment
 
 
(414
)
 
—

 
(414
)
Closing balance as at July 1, 2018 (Predecessor)
 
 
17,038

 
(4,507
)
 
12,531

Fresh Start adjustments
 
 
(10,241
)
 
4,507

 
(5,734
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Opening balance as at July 2, 2018 (Successor)
 
 
6,797

 
—

 
6,797

Additions
 
 
93

 
—

 
93

Depreciation
 
 
—

 
(231
)
 
(231
)
Closing balance as at December 31, 2018 (Successor)
 
 
6,890

 
(231
)
 
6,659

Additions
 
 
158

 
—

 
158

Depreciation
 
 
—

 
(416
)
 
(416
)
Closing balance as at December 31, 2019 (Successor)
 
 
7,048

 
(647
)
 
6,401