XML 127 R120.htm IDEA: XBRL DOCUMENT
v3.21.2

Subsequent Events (Details) - USD ($) $ in Millions |  |  | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 09, 2021 | Jul. 02, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 24, 2021 | Jan. 15, 2021
Subsequent Event [Line Items] |  |  |  |  |  |
Gain on disposals |  |  | $ 11 | $ 0 |  |
Secured debt | Senior Secured Notes |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Interest rate |  |  |  |  |  | 12.00%
Subsequent event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Plan of reorganization, new financing raised |  |  |  |  | $ 350 |
Plan of reorganization, reduction of liabilities |  |  |  |  | $ 4,900 |
Principal noteholders approving amendments | 80.00% |  |  |  |  |
Subsequent event | West Freedom |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Gain on disposals |  | $ 5 |  |  |  |

X
- Definition Plan Of Reorganization, New Financing Raised + References No definition available. + Details
Name: | sdrl_PlanOfReorganizationNewFinancingRaised
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Plan Of Reorganization, Reduction Of Liabilities + References No definition available. + Details
Name: | sdrl_PlanOfReorganizationReductionOfLiabilities
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Principal Noteholders Approving Amendments, Percentage + References No definition available. + Details
Name: | sdrl_PrincipalNoteholdersApprovingAmendmentsPercentage
Namespace Prefix: | sdrl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=sdrl_SeniorSecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=sdrl_WestFreedomMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |