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Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014 service segments contract
Segment Reporting Information [Line Items]
Number of operating segments	3us-gaap_NumberOfOperatingSegments
Number of reportable segments	2us-gaap_NumberOfReportableSegments
Number of services	1esv_NumberOfServices
Number of drilling management contracts	6esv_NumberOfDrillingManagementContracts
Moored Semisubmersible Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	5
Jackup Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	42
Floaters [Member]
Segment Reporting Information [Line Items]
Number of drillships	7esv_NumberOfDrillships / us-gaap_StatementBusinessSegmentsAxis = esv_FloatersMember
Floaters [Member] | Dynamically Positioned Semisubmersible [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	13
Floaters [Member] | Moored Semisubmersible Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	5
Floaters [Member] | Ultra-Deepwater [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	3
Jackups [Member] | Jackup Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	42
Jackups [Member] | Asset under Construction [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	4
Asia Pacific, Europe and Mediterranean, Middle East and Africa and North and South America [Member] | Jackups [Member] | Jackup Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs	38

X

- Definition

Number Of Contract Drilling Rig

+ References

No definition available.

+ Details

Name:	esv_NumberOfContractDrillingRigs
Namespace Prefix:	esv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Drilling Management Contracts

+ References

No definition available.

+ Details

Name:	esv_NumberOfDrillingManagementContracts
Namespace Prefix:	esv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of drillships.

+ References

No definition available.

+ Details

Name:	esv_NumberOfDrillships
Namespace Prefix:	esv_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of Services

+ References

No definition available.

+ Details

Name:	esv_NumberOfServices
Namespace Prefix:	esv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=esv_JackupRigsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=esv_MooredSemisubmersibleRigsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=esv_FloatersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=esv_JackupsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=esv_AsiaPacificEuropeAndMediterraneanMiddleEastAndAfricaAndNorthAndSouthAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: