Commercial Paper, Capacity

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- Definition

Debt Instrument Maturity Term Years

+ References

No definition available.

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- Definition

Maximum Days Of Maturity Of Notes

+ References

No definition available.

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- Definition

Maximum Percentage Of Debt To Total Capitalization Ratio

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No definition available.

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- Definition

Number of semiannual principal installments.

+ References

No definition available.

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- Definition

Semiannual principal installment amount.

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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- Definition

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

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- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

Amount of interest capitalized during the period.

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-Glossary Allowance for Funds Used during Construction

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Amount of the cost of borrowed funds accounted for as interest expense.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Fair value of the amount outstanding under the credit facility.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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- Definition

The fair value of notes issued in noncash investing and financing activities.

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Weighted average interest rate of short-term debt outstanding.

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Debt (Narrative) (Details) (USD $)	12 Months Ended
Debt (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014
Debt Instrument [Line Items]
Commercial paper	$ 0us-gaap_CommercialPaper	$ 0us-gaap_CommercialPaper
Gains (Losses) on Extinguishment of Debt	600,000
Net unamortized premiums	247,900,000
Interest Expense	161,400,000us-gaap_InterestExpense	158,800,000us-gaap_InterestExpense	123,600,000us-gaap_InterestExpense
Capitalized interest	78,200,000us-gaap_InterestCostsCapitalized	67,700,000us-gaap_InterestCostsCapitalized	105,800,000us-gaap_InterestCostsCapitalized
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Commercial paper, capacity	2,250,000,000
Maximum days of maturity of notes	364
Weighted-average interest rate	0.26%	0.35%
Debentures Due 2027 [Member]
Debt Instrument [Line Items]
Unsecured debt instruments issued	150,000,000.0
Debt instrument interest rate stated percentage	7.20%
Debt Instrument, Redemption Price, Percentage	100.00%
ENSCO 7500 [Member] \| Bonds Due 2015 And 2020 [Member]
Debt Instrument [Line Items]
Aggregate amount of unsecured debt instrument	190,000,000.0
Debt instrument maturity term, years	15
ENSCO 105 [Member] \| Bonds Due 2015 And 2020 [Member]
Debt Instrument [Line Items]
Unsecured debt instruments issued	76,500,000
Debt instrument interest rate stated percentage	4.65%
Number of semiannual principal installments	34
Semiannual principal installment amount	2,300,000
Debt instrument maturity term, years	17
Four Point Five Percent Senior Notes Member [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.50%
Debt instrument maturity period	2024
Four Point Five Percent Senior Notes Member [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.50%
Aggregate amount of unsecured debt instrument	625,000,000
Discount to senior notes	850,000
Debt instrument maturity period	2024
Five Point Seven Five Percent Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	5.75%
Debt instrument maturity period	2044
Five Point Seven Five Percent Senior Notes [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	5.75%
Aggregate amount of unsecured debt instrument	625,000,000
Discount to senior notes	2,800,000
Debt instrument maturity period	2044
6.875% Senior notes due 2020 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	6.875%
Debt instrument maturity period	2020
6.875% Senior notes due 2020 [Member] \| Acquired Debt [Member]
Debt Instrument [Line Items]
Unsecured debt instruments issued	900,000,000
Debt instrument interest rate stated percentage	6.875%
Debt instrument maturity period	2020
8.50% Senior notes due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	8.50%
Debt instrument maturity period	2019
8.50% Senior notes due 2019 [Member] \| Acquired Debt [Member]
Debt Instrument [Line Items]
Unsecured debt instruments issued	500,000,000
Debt instrument interest rate stated percentage	8.50%
Debt instrument maturity period	2019
7.875% Senior notes due 2040 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	7.875%
Debt instrument maturity period	2040
7.875% Senior notes due 2040 [Member] \| Acquired Debt [Member]
Debt Instrument [Line Items]
Unsecured debt instruments issued	300,000,000
Debt instrument interest rate stated percentage	7.875%
Debt instrument maturity period	2040
4.33% MARAD bonds due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.33%
Debt instrument maturity period	2016
4.33% MARAD bonds due 2016 [Member] \| Acquired Debt [Member]
Debt Instrument [Line Items]
Unsecured debt instruments issued	151,500,000
3.25% Senior notes due 2016 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.25%
Debt instrument maturity period	2016
3.25% Senior notes due 2016 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	3.25%
Aggregate amount of unsecured debt instrument	1,000,000,000
Discount to senior notes	7,600,000
Debt instrument maturity period	2016
4.70% Senior notes due 2021 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.70%
Debt instrument maturity period	2021
4.70% Senior notes due 2021 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate stated percentage	4.70%
Aggregate amount of unsecured debt instrument	1,500,000,000
Discount to senior notes	29,600,000
Debt instrument maturity period	2021
Five Year Credit Facility Member
Debt Instrument [Line Items]
Current borrowing capacity	2,250,000,000			2,000,000,000
Total facility fee commitment	0	0
Maximum amount of right to increase the commitment	2,750,000,000
Amounts outstanding	0	0
Line of Credit Facility, Fair Value of Amount Outstanding	$ 0
Base Rate [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Basis spread on variable rate	0.125%
London Interbank Offered Rate (LIBOR) [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	1.125%
Maximum [Member] \| Five Year Credit Facility Member
Debt Instrument [Line Items]
Maximum percentage of debt to total capitalization ratio	50.00%