Disposal Group, Including Discontinued Operation, Ownership Percentage in Disposed Asset

No definition available.

Name:	sdrl_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset
Namespace Prefix:	sdrl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Drilling Units Managed And Operated For Related Parties

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfDrillingUnitsManagedAndOperatedForRelatedParties
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Drillships

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfDrillships
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Floating Operating Rigs

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfFloatingOperatingRigs
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Harsh Environment Operating Rigs

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfHarshEnvironmentOperatingRigs
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Jackup Operating Rigs

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfJackupOperatingRigs
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Jackup Units

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfJackupUnits
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Offshore Drilling Units Operated

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfOffshoreDrillingUnitsOperated
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of offshore drilling units owned by the Company.

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfOffshoreDrillingUnitsOwnedByCompany
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Rigs Cold Stacked

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfRigsColdStacked
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Rigs Under Lease

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfRigsUnderLease
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Semi-Submersible Units

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfSemiSubmersibleUnits
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Tender-Assist Units Sold

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfTenderAssistUnitsSold
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Tender-Assisted Rigs

+ References

No definition available.

+ Details

Name:	sdrl_NumberOfTenderAssistedRigs
Namespace Prefix:	sdrl_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferredOther1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Indicates designation of financial information when substantially all business or separately identifiable line of business transfers from one entity to another entity. Acceptable values are "Predecessor" and "Successor".

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 45
-Paragraph 27
-URI https://asc.fasb.org/extlink&oid=124437977&loc=SL2890601-112764

+ Details

Name:	us-gaap_FinancialDesignationPredecessorAndSuccessorFixedList
Namespace Prefix:	us-gaap_
Data Type:	us-types:financialDesignationType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=sdrl_ParatusEnergyServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sdrl_AquadrillLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=sdrl_SeventhGenerationDrillshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=sdrl_SixthGenerationDrillshipsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=sdrl_BenignEnvironmentSemiSubmersibleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=sdrl_SemiSubmersibleUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=sdrl_JackUpRigsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=sdrl_GulfdrillMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=sdrl_SonadrillMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=sdrl_SeaMexLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

General information (Details) shares in Thousands, $ in Millions		4 Months Ended
	Apr. 03, 2023 USD ($) rig shares	Jun. 30, 2022	Jul. 28, 2023 rig	Jun. 30, 2023 rig	Sep. 01, 2022 rig	Jan. 31, 2022 rig
Related Party Transaction [Line Items]
Number of offshore drilling units owned				22
Number of offshore drilling units operated				17
Number of rigs cold stacked				5
Number of floating operating rigs				11
Number of harsh environment operating rigs				2
Number of jackup operating rigs				3
Number of tender-assisted rigs				1
Number of jackup units					7	7
Number of offshore drilling units managed and operated for related parties				7
Number of drillships				2
Financial Designation, Predecessor and Successor [Fixed List]		Successor
Paratus Energy Services
Related Party Transaction [Line Items]
Percentage ownership disposed of (in percentage)						65.00%
Subsequent event
Related Party Transaction [Line Items]
Number of tender-assist units sold			3
Aquadrill LLC
Related Party Transaction [Line Items]
Number of tender-assisted rigs	3
Stock issued during period, shares, acquisitions (in shares) \| shares	29,900
Consideration settled by tax withholding \| $	$ 30
Consideration settled in cash \| $	$ 1
Number of drillships	4
Number of semi-submersible units	1
Seventh generation drillships
Related Party Transaction [Line Items]
Number of floating operating rigs				7
Sixth generation drillships
Related Party Transaction [Line Items]
Number of floating operating rigs				3
Benign environment semi-submersible
Related Party Transaction [Line Items]
Number of floating operating rigs				1
Benign environment semi-submersible \| Aquadrill LLC
Related Party Transaction [Line Items]
Number of offshore drilling units owned	1
Semi-submersible unit
Related Party Transaction [Line Items]
Number of harsh environment operating rigs				1
Jack up rigs
Related Party Transaction [Line Items]
Number of harsh environment operating rigs				1
Gulfdrill
Related Party Transaction [Line Items]
Number of rigs under lease				3
Number of tender-assisted rigs				3
Number of jackup units				3
Sonadrill
Related Party Transaction [Line Items]
Number of rigs under lease				1
Number of offshore drilling units managed and operated for related parties				2
SeaMex Limited
Related Party Transaction [Line Items]
Number of offshore drilling units managed and operated for related parties				5