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Supplementary Cash Flow Information - Non-cash Investing and Financing Activities (Detail) $ in Millions | 6 Months Ended
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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