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Leases - Additional Information (Details) | Jun. 30, 2021 well jack-up_rig
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Leases [Abstract] |
Number of jack-up rigs leased | jack-up_rig | 3
Number of wells under drilling contracts | 10
Number of optional wells under drilling contracts | 4

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- Definition Lessee, Operating Lease, Number Of Leased Rigs + References No definition available. + Details
Name: | sdrl_LesseeOperatingLeaseNumberOfLeasedRigs
Namespace Prefix: | sdrl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Optional Wells Under Drilling Contract + References No definition available. + Details
Name: | sdrl_NumberOfOptionalWellsUnderDrillingContract
Namespace Prefix: | sdrl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Wells Under Drilling Contract + References No definition available. + Details
Name: | sdrl_NumberOfWellsUnderDrillingContract
Namespace Prefix: | sdrl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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