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Revenue from Contracts with Customers - Additional Information (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Revenue From Contract With Customers [Line Items] |
Amortization of deferred contract costs | $ 15
Other Current Assets [Member] |
Revenue From Contract With Customers [Line Items] |
Deferred contract costs | 9
Other Noncurrent Assets [Member] |
Revenue From Contract With Customers [Line Items] |
Deferred contract costs | $ 2

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- Definition Amortization of deferred contract costs. + References No definition available. + Details
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Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred Contract Costs + References No definition available. + Details
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Namespace Prefix: | sdrl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Revenue From Contract With Customers [Line Items] + References No definition available. + Details
Name: | sdrl_RevenueFromContractWithCustomersLineItems
Namespace Prefix: | sdrl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |