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Shareholders' Equity (Details) - Class A ordinary shares, U.S. [Member] shares in Millions	May 22, 2017 shares
Class of Stock [Line Items]
Shares authorized under UK law (in shares)	101.1
Shares authorized, offered by way of a rights issue or similar issue under UK law (in shares)	202.2

X

- Definition

Common Stock, Shares Authorized, Offered with a Rights Issue, Under UK Law

+ References

No definition available.

+ Details

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Namespace Prefix:	esv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Common Stock, Shares Authorized, Under UK Law

+ References

No definition available.

+ Details

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Namespace Prefix:	esv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: