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Variable Interest Entities (VIEs) - Summary of Sale and Leaseback Arrangements (Detail) $ in Millions	6 Months Ended
	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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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