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Variable Interest Entities (VIEs) - Summary of Sale and Leaseback Arrangements (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
West Taurus [Member] |
Variable Interest Entity [Line Items] |
Sale value | $ 850
First repurchase option | 418
Last repurchase option | 149
SFL Hercules Limited [Member] |
Variable Interest Entity [Line Items] |
Sale value | 850
First repurchase option | 580
Last repurchase option | 135
SFL Linus Limited [Member] |
Variable Interest Entity [Line Items] |
Sale value | 600
First repurchase option | 370
Last repurchase option | $ 170

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- Definition The repurchase amount under the first repurchase option pursuant to the sale and leaseback arrangement. + References No definition available. + Details
Name: | sdrl_FirstRepurchaseOption
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The repurchase amount under the last repurchase option pursuant to the sale and leaseback arrangement. + References No definition available. + Details
Name: | sdrl_LastRepurchaseOption
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757 + Details
Name: | us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=sdrl_WestTaurusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=sdrl_WestHerculesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SaleLeasebackTransactionDescriptionAxis=sdrl_WestLinusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |