Earnings Per Unit (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010		Sep. 30, 2011	Sep. 30, 2010		Dec. 31, 2010
Earnings Per Unit [Abstract]
Merger exchange ratio of Enterprise common units for each Holding unit							1.5
Numerator:
Net income attributable to partners	$ 471.4	$ 37.0		$ 1,325.8	$ 161.0
General partner interest in net income	0		[1]	0		[1]
Net income attributable to limited partners	471.4	37.0		1,325.8	161.0
Denominator:
Common units (in units)	817.9	208.8		812.9	208.8
Time-vested restricted common units (in units)	4.0	0		4.1	0
Total (in units)	821.9	208.8		817.0	208.8
Basic earnings per unit:
Net income attributable to partners (in dollars per unit)	$ 0.57	$ 0.18		$ 1.62	$ 0.77
General partner interest in net income (in dollars per unit)	$ 0		[1]	$ 0		[1]
Net income attributable to limited partners (in dollars per unit)	$ 0.57	$ 0.18		$ 1.62	$ 0.77
Numerator:
Net income attributable to partners	471.4	37.0		1,325.8	161.0
General partner interest in net income	0		[1]	0		[1]
Net income attributable to limited partners	$ 471.4	$ 37.0		$ 1,325.8	$ 161.0
Denominator:
Common units (in units)	817.9	208.8		812.9	208.8
Time-vested restricted common units (in units)	4.0	0		4.1	0
Class B units (in units)	4.5	0		4.5	0
Designated Units (in units)	30.6	0		30.6	0
Incremental option units (in units)	1.2	0		1.2	0
Total (in units)	858.2	208.8		853.3	208.8
Diluted earnings per unit:
Net income attributable to partners (in dollars per unit)	$ 0.55	$ 0.18		$ 1.55	$ 0.77
General partner interest in net income (in dollars per unit)	$ 0		[1]	$ 0		[1]
Net income attributable to limited partners (in dollars per unit)	$ 0.55	$ 0.18		$ 1.55	$ 0.77

[1] Amount is negligible.