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v3.20.4

Equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Equipment | Equipment consists of office equipment, software, furniture and fittings. Changes in equipment balances for the periods presented in this report were as follows:
(In $ millions) |  | Cost |  | Accumulated depreciation |  | Net book value
January 1, 2019 |  | 34 |  |  | (5) |  |  | 29 |
Additions |  | 4 |  |  | — |  |  | 4 |
Depreciation |  | — |  |  | (10) |  |  | (10) |
December 31, 2019 |  | 38 |  |  | (15) |  |  | 23 |
Additions |  | 1 |  |  | — |  |  | 1 |
Depreciation |  | — |  |  | (5) |  |  | (5) |
December 31, 2020 |  | 39 |  |  | (20) |  |  | 19 |

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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: | nonnum: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