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Supplementary Cash Flow Information - Non-cash Investing and Financing Activities (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Supplemental Cash Flow Elements [Abstract]
Sale of rigs and equipment	$ 74
Repayment of debt following sale of rigs and equipment	(74)
Dividend to non-controllinginterests in VIEs	$ (14)

X

- Definition

Noncash financing activities, Dividends to noncontrolling interests.

+ References

No definition available.

+ Details

Name:	sdrl_NoncashFinancingActivitiesDividendsToNoncontrollingInterests
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Noncash financing activities, Repayment of debt.

+ References

No definition available.

+ Details

Name:	sdrl_NoncashFinancingActivitiesRepaymentOfDebt
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Noncash or part noncash divestiture, Sale of machinery and equipment.

+ References

No definition available.

+ Details

Name:	sdrl_NoncashOrPartNoncashDivestitureSaleOfMachineryAndEquipment
Namespace Prefix:	sdrl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration