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Related party transactions - Ship Finance Transactions (Detail) - Ship Finance International Ltd VIEs [Member] - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Related Party Transaction [Line Items]
Lease costs on leased units	$ 68	$ 94
SFL Hercules Limited [Member]
Related Party Transaction [Line Items]
Lease costs on leased units	20	28
West Taurus [Member]
Related Party Transaction [Line Items]
Lease costs on leased units	18	25
SFL Linus Limited [Member]
Related Party Transaction [Line Items]
Lease costs on leased units	$ 30	$ 41

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

The amount of the current period expense recorded for use of the property in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

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Balance Type:	debit
Period Type:	duration

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- Details

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- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=sdrl_WestHerculesMember
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X

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=sdrl_WestTaurusMember
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- Details

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