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Related PartyTtransactions - Seabras Sapura Transactions - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018
Seabras Sapura Participacoes Sa [Member]
Related Party Transaction [Line Items]
Ownership interest	50.00%
Ownership percentage held by equity method investee	50.00%
Seabras Sapura Hold Co Ltd [Member]
Related Party Transaction [Line Items]
Ownership interest	50.00%
Ownership percentage held by equity method investee	50.00%

X

- Definition

Ownership percentage held by equity eethod investee.

+ References

No definition available.

+ Details

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Namespace Prefix:	sdrl_
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Period Type:	duration

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

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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

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- Details

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X

- Details

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