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

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- 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