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Related Party Transactions - Receivables (Payables) with Seadrill Partners (Detail) - Seadrill Partners LLC [Member] - Equity Method Investee [Member] - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Rig Financing and Loan Agreements [Member]
Related Party Transaction [Line Items]
Receivables (payables)		$ 25
Deferred Consideration Receivable [Member]
Related Party Transaction [Line Items]
Receivables (payables)	$ 41	52
Other Receivables [Member]
Related Party Transaction [Line Items]
Receivables (payables)	(148)	(157)
Other Payables [Member]
Related Party Transaction [Line Items]
Receivables (payables)	$ (7)	$ (24)

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- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Balance Type:	debit
Period Type:	instant

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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- Details

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- Details

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- Details

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- Details

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- Details

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