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Variable Interest Entities (VIEs) - Summary of Sale and Leaseback Arrangements (Parenthetical) (Detail) $ in Millions		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Variable Interest Entity [Line Items]
Term of lease contracts	15 years
West Taurus [Member]
Variable Interest Entity [Line Items]
Term of lease contracts		15 years
SFL Hercules Limited [Member]
Variable Interest Entity [Line Items]
Term of lease contracts		15 years
SFL Linus Limited [Member]
Variable Interest Entity [Line Items]
Repurchase obligation	$ 100	$ 100

X

- Definition

The agreed amount of the repurchase obligation at the end of the lease terms pursuant to the sale and leaseback arrangement.

+ References

No definition available.

+ Details

Name:	sdrl_RepurchaseObligation
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Term of lease contracts.

+ References

No definition available.

+ Details

Name:	sdrl_TermOfLeaseContracts
Namespace Prefix:	sdrl_
Data Type:	xbrli:durationItemType
Balance Type:	na
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: