Earnings Per Unit (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			6 Months Ended			12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010		Jun. 30, 2011	Jun. 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	$ 433.7	$ 54.1		$ 854.4	$ 124.0
General partner interest in net income	0		[1]	0		[1]
Net income attributable to limited partners	433.7	54.1		854.4	124.0
Denominator:
Common units (in units)	810.8	208.8		810.3	208.8
Time-vested restricted common units (in units)	4.3	0		4.2	0
Total (in units)	815.1	208.8		814.5	208.8
Basic earnings per unit:
Net income attributable to partners (in dollars per unit)	$ 0.53	$ 0.26		$ 1.05	$ 0.59
General partner interest in net income (in dollars per unit)	$ 0		[1]	$ 0		[1]
Net income attributable to limited partners (in dollars per unit)	$ 0.53	$ 0.26		$ 1.05	$ 0.59
Numerator:
Net income attributable to partners	433.7	54.1		854.4	124.0
General partner interest in net income	0		[1]	0		[1]
Net income attributable to limited partners	$ 433.7	$ 54.1		$ 854.4	$ 124.0
Denominator:
Common units (in units)	810.8	208.8		810.3	208.8
Time-vested restricted common units (in units)	4.3	0		4.2	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		1.3	0
Total (in units)	851.4	208.8		850.9	208.8
Diluted earnings per unit:
Net income attributable to partners (in dollars per unit)	$ 0.51	$ 0.26		$ 1.00	$ 0.59
General partner interest in net income (in dollars per unit)	$ 0		[1]	$ 0		[1]
Net income attributable to limited partners (in dollars per unit)	$ 0.51	$ 0.26		$ 1.00	$ 0.59

[1] Amount is negligible.