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Contingencies (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) plaintiffs
Oil and Gas Delivery Commitments and Contracts [Line Items]
Loss Contingency, Number of Plaintiffs	46
Loss Contingency, Claims Settled, Number	58
Loss Contingency, Claims Settled Pending Documentation, Number	13
Letters of Credit Outstanding, Amount | $	$ 72.3

X

- Definition

Loss Contingency, Claims Settled Pending Documentation, Number

+ References

No definition available.

+ Details

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Namespace Prefix:	esv_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Number of claims settled.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Number of plaintiffs that have filed claims pertaining to a loss contingency.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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