Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($)	Dec. 31, 2018	Dec. 11, 2018	Dec. 31, 2017
Debt Instrument
Outstanding Principal	$ 4,461,400,000		$ 3,574,600,000
Less: net discount	(6,100,000)		(6,300,000)
Long-Term Debt	4,455,300,000		3,568,300,000
Less: debt issuance cost	(24,500,000)		(26,200,000)
Less: current maturities of long-term debt	(399,800,000)		0
Long-term debt, net of unamortized issuance cost	4,031,000,000		3,542,100,000
Debt issuance cost accumulated amortization	16,500,000		12,900,000
ENLC credit facility due 2019
Debt Instrument
Outstanding Principal	111,400,000		74,600,000
Less: net discount	0
Long-Term Debt	111,400,000		74,600,000
Long-term Line of Credit	$ 111,400,000		$ 74,600,000
Effective interest rate	4.40%		3.20%
Term Loan due 2021
Debt Instrument
Outstanding Principal	$ 850,000,000		$ 0
Less: net discount	0		0
Long-Term Debt	$ 850,000,000		0
2.70% Senior unsecured notes due 2019
Debt Instrument
Stated interest rate	2.70%
Outstanding Principal	$ 400,000,000		400,000,000
Less: net discount	0		(100,000)
Long-Term Debt	$ 400,000,000		399,900,000
4.40% Senior unsecured notes due 2024
Debt Instrument
Stated interest rate	4.40%
Outstanding Principal	$ 550,000,000		550,000,000
Less: net discount	1,800,000		2,200,000
Long-Term Debt	$ 551,800,000		552,200,000
4.15% Senior unsecured notes due 2025
Debt Instrument
Stated interest rate	4.15%
Outstanding Principal	$ 750,000,000		750,000,000
Less: net discount	(900,000)		(1,000,000)
Long-Term Debt	$ 749,100,000		749,000,000
4.85% Senior unsecured notes due 2026
Debt Instrument
Stated interest rate	4.85%
Outstanding Principal	$ 500,000,000		500,000,000
Less: net discount	(500,000)		(600,000)
Long-Term Debt	$ 499,500,000		499,400,000
5.60% Senior unsecured notes due 2044
Debt Instrument
Stated interest rate	5.60%
Outstanding Principal	$ 350,000,000		350,000,000
Less: net discount	(200,000)		(200,000)
Long-Term Debt	$ 349,800,000		349,800,000
5.05% Senior unsecured notes due 2045
Debt Instrument
Stated interest rate	5.05%
Outstanding Principal	$ 450,000,000		450,000,000
Less: net discount	(6,200,000)		(6,500,000)
Long-Term Debt	$ 443,800,000		443,500,000
5.45% Senior unsecured notes due 2047
Debt Instrument
Stated interest rate	5.45%
Outstanding Principal	$ 500,000,000		500,000,000
Less: net discount	(100,000)		(100,000)
Long-Term Debt	499,900,000		$ 499,900,000
Unsecured Debt \| Term Loan due 2021
Debt Instrument
Debt instrument, face amount	$ 850,000,000	$ 850,000,000
Effective interest rate	3.90%

Amount of long-term debt after unamortized (discount) premium and before debt issuance costs.

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- Definition

Amount of accumulated amortization of debt issuance costs.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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- 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.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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