Drilling units (Tables)

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Schedule of drilling units

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)	17,335		(4,119	)	13,216
Additions	117		—		117
Depreciation	—		(388	)	(388	)
Impairment	(414	)	—		(414	)
As at June 30, 2018 (Predecessor)	17,038		(4,507	)	12,531

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)	6,890	(231	)	6,659
Additions	61	—		61
Depreciation	—	(207	)	(207	)
As at June 30, 2019 (Successor)	6,951	(438	)	6,513