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Variable Interest Entities (VIEs) - Summary of Sale and Leaseback Arrangements (Parenthetical) (Detail) $ in Millions |  | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($)
Variable Interest Entity [Line Items] |  |
Term of lease contracts | 15 years |
West Taurus [Member] |  |
Variable Interest Entity [Line Items] |  |
Term of lease contracts |  | 15 years
SFL Hercules Limited [Member] |  |
Variable Interest Entity [Line Items] |  |
Term of lease contracts |  | 15 years
SFL Linus Limited [Member] |  |
Variable Interest Entity [Line Items] |  |
Repurchase obligation | $ 100 | $ 100

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- Definition The agreed amount of the repurchase obligation at the end of the lease terms pursuant to the sale and leaseback arrangement. + References No definition available. + Details
Name: | sdrl_RepurchaseObligation
Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term of lease contracts. + References No definition available. + Details
Name: | sdrl_TermOfLeaseContracts
Namespace Prefix: | sdrl_
Data Type: | xbrli:durationItemType
Balance Type: | na
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: |