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Guarantee Of Registered Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Guarantor Obligations [Line Items]
Senior notes aggregate outstanding principal balance	1,700.0us-gaap_SeniorNotes
8.50% Senior Notes [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember	8.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_EightPointFiveZeroPercentSeniorNotesMember
Debt Instrument, Maturity Date	2019
6.875% Senior Notes due 2020 [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember	6.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SixPointEightSevenFivePercentSeniorNotesDueTwoThousandTwentyMember
Debt Instrument, Maturity Date	2020
7.875% Senior Notes [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember	7.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointEightSevenFivePercentSeniorNotesMember
Debt Instrument, Maturity Date	2040
7.20% Debentures Due 2027 [Member]
Guarantor Obligations [Line Items]
Debt instrument interest rate stated percentage	7.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesDueTwoThousandTwentySevenMember
Debt Instrument, Maturity Date	2027
Senior notes aggregate outstanding principal balance	150.0us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = esv_SevenPointTwoZeroPercentDebenturesDueTwoThousandTwentySevenMember

X

- Definition

Senior Note Maturity Year

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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