Cash Transferred To Restricted Cash

No definition available.

Name:	sdrl_CashTransferredToRestrictedCash
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payment For Settlement Prepetition Obligations

+ References

No definition available.

+ Details

Name:	sdrl_PaymentForSettlementPrepetitionObligations
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payment of AOD Cash Out Option

+ References

No definition available.

+ Details

Name:	sdrl_PaymentOfAODCashOutOption
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payment Of Advisor Fees

+ References

No definition available.

+ Details

Name:	sdrl_PaymentOfAdvisorFees
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 230
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123444420&loc=d3e33268-110906

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3521-108585

+ Details

Name:	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

+ Details

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

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_ReorganizationChapter11LineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=us-gaap_ReorganizationChapter11PlanEffectAdjustmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sdrl_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sdrl_ConvertibleBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=sdrl_NewSecondLienFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Fresh Start Accounting - Reorganization Adjustments, Cash and Cash Equivalents (Details) - USD ($) $ in Millions		2 Months Ended	4 Months Ended	6 Months Ended
	Feb. 22, 2022	Feb. 22, 2022	Jun. 30, 2022	Jun. 30, 2023
Reorganization, Chapter 11 [Line Items]
Proceeds from debt		$ 175	$ 0	$ 0
Reorganization Adjustments
Reorganization, Chapter 11 [Line Items]
Settlement of the Prepetition Credit Agreement	$ (683)
Payment of the AOD cash out option	(116)
Payment of success-based advisor fees	(28)
Payment of the arrangement & financing fee for the Term Loan Facility	(30)
Transfer of cash to restricted cash for the professional fee escrow account funding	(2)
Change in cash and cash equivalents	74
Reorganization Adjustments \| Term loan facility
Reorganization, Chapter 11 [Line Items]
Proceeds from debt	175
Payment of the arrangement & financing fee for the Term Loan Facility	(5)
Reorganization Adjustments \| Convertible Bonds
Reorganization, Chapter 11 [Line Items]
Proceeds from debt	50
Reorganization Adjustments \| New Second Lien Facility
Reorganization, Chapter 11 [Line Items]
Proceeds from debt	$ 683