Business Combinations, Purchase Price Allocation (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Jul. 02, 2015	Oct. 02, 2014	Dec. 31, 2013	Dec. 31, 2012
Liabilities assumed in business combination:
Goodwill		$ 5,745.2	$ 4,300.2			$ 2,080.0	$ 2,086.8
Eagle Ford Midstream Assets [Member]
Consideration:
Cash		1,069.9
Accrued liability related to EFS Midstream acquisition		986.6
Fair value of total consideration transferred		2,056.5
Indentifiable assets acquired in business combination:
Current assets, including cash				$ 64.0
Property, plant, and equipment				636.0
Identifiable intangible assets:
Intangible assets				1,409.8
Total assets acquired				2,109.8
Liabilities assumed in business combination:
Current liabilities				(9.6)
Long-term debt				(125.0)
Other long-term liabilities				(1.3)
Total liabilities assumed				(135.9)
Total assets acquired less liabilities assumed and noncontrolling interest				1,973.9
Total consideration for acquisition		$ 2,056.5
Goodwill				82.6
Business Combinations:
Cash acquired				13.4
Eagle Ford Midstream Assets [Member] | Pipelines and related equipment [Member]
Indentifiable assets acquired in business combination:
Property, plant, and equipment				366.0
Eagle Ford Midstream Assets [Member] | Processing equipment [Member]
Indentifiable assets acquired in business combination:
Property, plant, and equipment				112.0
Eagle Ford Midstream Assets [Member] | Electrical and metering equipment [Member]
Indentifiable assets acquired in business combination:
Property, plant, and equipment				84.0
Eagle Ford Midstream Assets [Member] | Pumps and compressors [Member]
Indentifiable assets acquired in business combination:
Property, plant, and equipment				42.0
Eagle Ford Midstream Assets [Member] | Other property, plant and equipment [Member]
Indentifiable assets acquired in business combination:
Property, plant, and equipment				$ 32.0
Oiltanking Partners L.P. - Step 1 [Member]
Consideration:
Cash			2,438.3
Equity instruments (54,807,352 common units of Enterprise)	[1]		2,171.5
Fair value of total consideration transferred			4,609.8
Indentifiable assets acquired in business combination:
Current assets, including cash					$ 68.0
Property, plant, and equipment					1,080.1
Identifiable intangible assets:
Intangible assets					2,949.1
Other assets					227.6
Total assets acquired					4,324.8
Liabilities assumed in business combination:
Current liabilities					(84.8)
Long-term debt					(223.3)
Other long-term liabilities	[2]				(230.0)
Total liabilities assumed					(538.1)
Noncontrolling interest in Oiltanking	[3]				(1,397.2)
Total assets acquired less liabilities assumed and noncontrolling interest					2,389.5
Total consideration for acquisition			$ 4,609.8
Goodwill					2,220.3
Business Combinations:
Cash acquired					$ 21.5
Common units issued in connection with acquisition of Oiltanking (in units)			54,807,352
Common unit price (in dollars per share)					$ 39.62
Liquidity Option Agreement					$ 219.7
Noncontrolling interests:
Inputs to calculate noncontrolling interests		28,328,890 Oiltanking common units at $49.32 per unit
Oiltanking Partners L.P. - Step 1 [Member] | Customer relationship intangibles [Member]
Identifiable intangible assets:
Intangible assets					1,192.4
Oiltanking Partners L.P. - Step 1 [Member] | Contract-based intangibles [Member]
Identifiable intangible assets:
Intangible assets					297.5
Oiltanking Partners L.P. - Step 1 [Member] | Incentive distribution rights [Member]
Identifiable intangible assets:
Intangible assets	[4]				$ 1,459.2

[1] The fair value of the equity-based consideration paid in connection with Step 1 of the Oiltanking acquisition was based on the closing market price of our common units of $39.62 per unit on the acquisition date.

[2] In connection with Step 1, we entered into the Liquidity Option Agreement with OTA and Marquard & Bahls ("M&B", a German corporation and ultimate parent company of OTA). Other long-term liabilities includes $219.7 million for the Liquidity Option Agreement (see Note 17).

[3] From an accounting perspective, Enterprise acquired control of Oiltanking as a result of completing Step 1. The estimated fair value of Oiltanking's common units held by parties other than Enterprise following Step 1 (i.e., the "noncontrolling interest") is based on 28,328,890 common units held by third parties on October 1, 2014 multiplied by the closing unit price for Oiltanking common units of $49.32 per unit on that date.

[4] The IDRs represented contractual rights to future cash incentive distributions to be paid by Oiltanking. These rights were granted to Oiltanking GP under the terms of Oiltanking's partnership agreement. Oiltanking GP could separate and sell the IDRs independent of its other residual general partner interest in Oiltanking. In February 2015 (following completion of Step 2 of the Oiltanking acquisition), the Oiltanking IDRs were cancelled and the carrying value of this intangible asset was reclassified to goodwill.