Earnings Per Unit (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Earnings per unit:
Merger exchange ratio of Enterprise common units for each Holding unit										1.5
Numerator:
Net income attributable to partners	$ 721.1	$ 471.4	$ 433.7	$ 420.7	$ 159.8	$ 37.0	$ 54.1	$ 69.9	$ 2,046.9	$ 320.8		$ 204.1
General partner interest in net income									0		[1]		[1]
Allocation of net income to limited partners									2,046.9	320.8		204.1
Denominator:
Common units (in units)									820.5	274.1		206.7
Time-vested restricted common units (in units)									4.1	0.4		0
Total (in units)									824.6	274.5		206.7
Basic earnings per unit:
Net income attributable to partners (in dollars per unit)									$ 2.48	$ 1.17		$ 0.99
General partner interest in net income (in dollars per unit)									$ 0		[1]		[1]
Net income attributable to limited partners (in dollars per unit)	$ 0.85	$ 0.57	$ 0.53	$ 0.52	$ 0.34	$ 0.18	$ 0.26	$ 0.33	$ 2.48	$ 1.17		$ 0.99
Numerator:
Net income attributable to partners	721.1	471.4	433.7	420.7	159.8	37.0	54.1	69.9	2,046.9	320.8		204.1
General partner interest in net income									0		[1]		[1]
Allocation of net income to limited partners									$ 2,046.9	$ 320.8		$ 204.1
Denominator:
Common units (in units)									820.5	274.1		206.7
Time-vested restricted common units (in units)									4.1	0.4		0
Class B units (in units)									4.5	0.5		0
Designated Units (in units)									29.5	3.4		0
Incremental option units (in units)									1.3	0.1		0
Total (in units)									859.9	278.5		206.7
Diluted earnings per unit:
Net income attributable to partners (in dollars per unit)									$ 2.38	$ 1.15		$ 0.99
General partner interest in net income (in dollars per unit)									$ 0		[1]		[1]
Net income attributable to limited partners (in dollars per unit)	$ 0.82	$ 0.55	$ 0.51	$ 0.49	$ 0.33	$ 0.18	$ 0.26	$ 0.33	$ 2.38	$ 1.15		$ 0.99

[1] Amount is negligible.