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

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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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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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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.

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Long-Term Debt (Indebtedness Table) (Details) (USD $)	12 Months Ended
Long-Term Debt (Indebtedness Table) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of debt	$ 3,200,000	$ 0	$ 0
Total outstanding debt	2,022,500,000us-gaap_LongTermDebt
Line of Credit Facility, Amount Outstanding	237,000,000us-gaap_LineOfCredit
Other Long-term Debt	400,000us-gaap_OtherLongTermDebt
Line of Credit
Debt Instrument [Line Items]
Total outstanding debt	237,000,000
ENLC Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding	0
2.7% Senior Notes due 2019
Debt Instrument [Line Items]
Senior Notes	399,500,000
7.125% Senior Notes due 2022
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of debt	2,400,000
Senior Notes	184,400,000
8.875% Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Gains (Losses) on Extinguishment of debt	700,000
4.4% Senior Notes due 2024
Debt Instrument [Line Items]
Senior Notes	553,200,000
5.6% Senior Notes due 2044
Debt Instrument [Line Items]
Senior Notes	349,700,000
5.05% Senior Notes due 2045
Debt Instrument [Line Items]
Senior Notes	$ 298,300,000