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Leases - Additional Information (Details)	Jun. 30, 2021 well jack-up_rig
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

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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

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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