XML 87 R80.htm IDEA: XBRL DOCUMENT
v3.21.2

Impairment of long-lived assets (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Impairment Of Long-Lived Assets [Line Items] |  |
Loss on impairment of long-lived assets | $ 152 | $ 1,230
Discount rate | Discounted cash flow |  |
Impairment Of Long-Lived Assets [Line Items] |  |
Long-lived assets, measurement input | 0.118 | 0.128

X
- Definition Impairment Of Long-Lived Assets + References No definition available. + Details
Name: | sdrl_ImpairmentOfLongLivedAssetsLineItems
Namespace Prefix: | sdrl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-Lived Assets, Measurement Input + References No definition available. + Details
Name: | sdrl_LongLivedAssetsMeasurementInput
Namespace Prefix: | sdrl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + Details
Name: | us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_ValuationTechniqueDiscountedCashFlowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |