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Equipment (Tables) | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
Equipment | 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 |  | 38 |  |  | (15) |  |  | 23 |
Depreciation |  | — |  |  | (3) |  |  | (3) |
As at June 30, 2020 |  | 38 |  |  | (18) |  |  | 20
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 |  | 39 |  |  | (20) |  |  | 19 |
Depreciation |  | — |  |  | (3) |  |  | (3) |
As at June 30, 2021 |  | 39 |  |  | (23) |  |  | 16 |

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- Definition Tabular disclosure of equipment during the period. + References No definition available. + Details
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Namespace Prefix: | sdrl_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration