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Equipment | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
Equipment | Equipment Equipment consists of office equipment, software, furniture and fittings. 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 The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
Name: | sdrl_EquipmentTextBlock
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