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Drilling units | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
Drilling units | Drilling units 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.

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