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Drilling units

6 Months Ended

Jun. 30, 2021

Property, Plant and Equipment [Abstract]

The following table summarizes the movement for the six months ended June 30, 2020:


(In $ millions)	Cost	Accumulated depreciation	Net book value
As at January 1, 2020	7,048	(647)	6,401
Additions	85	—	85
Depreciation	—	(179)	(179)
Impairment	(1,230)	—	(1,230)
As at June 30, 2020	5,903	(826)	5,077

The following table summarizes the movement for the six months ended June 30, 2021:


(In $ millions)	Cost	Accumulated depreciation	Net book value
As at January 1, 2021	3,108	(988)	2,120
Additions	39	—	39
Depreciation	—	(80)	(80)
Impairment	(152)	—	(152)
As at June 30, 2021	2,995	(1,068)	1,927

In March 2020 we recorded a $1,230 million impairment in our fleet, while in June 2021 we recorded a $152 million impairment. Refer to Note 9 – "Impairment of long-lived assets" for further information.