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Earnings Per Share - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Plan of reorganization, equity securities issued or to be issued, ownership percentage | 2.00%

X
- Definition Plan of reorganization equity securities issued or to be issued ownership percentage. + References No definition available. + Details
Name: | sdrl_PlanOfReorganizationEquitySecuritiesIssuedOrToBeIssuedOwnershipPercentage
Namespace Prefix: | sdrl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration