Business Segments (Details) (USD $) In Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010		Dec. 31, 2010
Segment Gross Operating Margin [Abstract]
Revenues	$ 11,216.5		$ 7,543.4		$ 21,400.2		$ 16,087.9
Less: Operating costs and expenses	(10,533.3)		(6,974.2)		(20,070.4)		(14,946.1)
Add: Equity in income of unconsolidated affiliates	11.1		11.0		27.3		37.6
Depreciation, amortization and accretion in operating costs and expenses	233.3	[1]	227.0	[1]	464.1	[1]	439.4	[1]
Non-cash asset impairment charges	0		0		0		1.5
Operating lease expenses paid by EPCO	0.1		0.1		0.3		0.3
Losses (gains) from asset sales and related transactions in operating costs and expenses	(5.2)	[2]	1.7	[2]	(23.6)	[2]	(5.6)	[2]
Total segment gross operating margin	922.5		809.0		1,797.9		1,615.0
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	922.5		809.0		1,797.9		1,615.0
Adjustments to reconcile total segment gross operating margin to operating income:
Depreciation, amortization and accretion in operating costs and expenses	(233.3)	[1]	(227.0)	[1]	(464.1)	[1]	(439.4)	[1]
Non-cash asset impairment charges	0		0		0		(1.5)
Operating lease expenses paid by EPCO	(0.1)		(0.1)		(0.3)		(0.3)
Gains (losses) from asset sales and related transactions in operating costs and expenses	5.2	[2]	(1.7)	[2]	23.6	[2]	5.6	[2]
General and administrative costs	(50.4)		(40.5)		(88.3)		(80.8)
Operating income	643.9		539.7		1,268.8		1,098.6
Other expense, net	(188.0)		(178.8)		(371.3)		(336.6)
Income before provision for income taxes	455.9		360.9		897.5		762.0
Information by business segment [Abstract]
Revenues from third parties	11,072.3		7,427.4		21,005.9		15,739.5
Revenues from related parties	144.2		116.0		394.3		348.4
Intersegment and intrasegment revenues	0		0		0		0
Total revenues	11,216.5		7,543.4		21,400.2		16,087.9
Equity in income (loss) of unconsolidated affiliates	11.1		11.0		27.3		37.6
Gross operating margin	922.5		809.0		1,797.9		1,615.0
Segment assets	26,748.5				26,748.5				25,575.4
Property, plant and equipment, net (see Note 6)	20,798.9				20,798.9				19,332.9
Investments in unconsolidated affiliates (see Note 7)	2,085.9				2,085.9				2,293.1
Intangible assets, net (see Note 8)	1,756.6				1,756.6				1,841.7
Goodwill (see Note 8)	2,107.1				2,107.1				2,107.7
Consolidated Revenues and Expenses [Abstract]
Total consolidated revenues	11,216.5		7,543.4		21,400.2		16,087.9
Operating costs and expenses:
Cost of sales related to our marketing activities	8,727.5		5,693.5		16,657.6		12,342.7
Depreciation, amortization and accretion	233.3	[1]	227.0	[1]	464.1	[1]	439.4	[1]
Losses (gains) from asset sales and related transactions	(5.2)	[2]	1.7	[2]	(23.6)	[2]	(5.6)	[2]
Non-cash asset impairment charges	0		0		0		1.5
Other operating costs and expenses	1,577.7		1,052.0		2,972.3		2,168.1
General and administrative costs	50.4		40.5		88.3		80.8
Total costs and expenses (see Note 11)	10,583.7		7,014.7		20,158.7		15,026.9
NGL Pipelines and Services [Member]
Segment Gross Operating Margin [Abstract]
Revenues	4,036.9		2,979.3		8,293.7		6,825.6
Add: Equity in income of unconsolidated affiliates	6.2		3.7		12.1		7.0
Total segment gross operating margin	497.7		441.0		1,002.1		878.3
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	497.7		441.0		1,002.1		878.3
Information by business segment [Abstract]
Revenues from third parties	3,960.1		2,923.8		8,015.5		6,590.1
Revenues from related parties	76.8		55.5		278.2		235.5
Intersegment and intrasegment revenues	3,228.2		2,407.7		6,702.8		4,954.9
Total revenues	7,265.1		5,387.0		14,996.5		11,780.5
Equity in income (loss) of unconsolidated affiliates	6.2		3.7		12.1		7.0
Gross operating margin	497.7		441.0		1,002.1		878.3
Segment assets	7,673.7				7,673.7				7,665.5
Property, plant and equipment, net (see Note 6)	6,851.5				6,851.5				6,813.1
Investments in unconsolidated affiliates (see Note 7)	131.7				131.7				131.5
Intangible assets, net (see Note 8)	349.3				349.3				379.7
Goodwill (see Note 8)	341.2	[3]			341.2	[3]			341.2	[3]
Consolidated Revenues and Expenses [Abstract]
Sales of NGLs	3,831.5		2,804.4		7,888.6		6,468.5
Sales of other petroleum and related products	0.7		0.7		1.3		1.2
Midstream services	204.7		174.2		403.8		355.9
Total consolidated revenues	4,036.9		2,979.3		8,293.7		6,825.6
Onshore Natural Gas Pipelines And Services [Member]
Segment Gross Operating Margin [Abstract]
Revenues	927.3		844.9		1,843.9		2,006.4
Add: Equity in income of unconsolidated affiliates	1.5		0.9		2.7		2.2
Total segment gross operating margin	161.1		106.9		320.3		237.2
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	161.1		106.9		320.3		237.2
Information by business segment [Abstract]
Revenues from third parties	862.5		786.2		1,734.2		1,897.3
Revenues from related parties	64.8		58.7		109.7		109.1
Intersegment and intrasegment revenues	253.9		212.7		524.8		428.3
Total revenues	1,181.2		1,057.6		2,368.7		2,434.7
Equity in income (loss) of unconsolidated affiliates	1.5		0.9		2.7		2.2
Gross operating margin	161.1		106.9		320.3		237.2
Segment assets	8,276.2				8,276.2				8,184.8
Property, plant and equipment, net (see Note 6)	6,727.7				6,727.7				6,595.0
Investments in unconsolidated affiliates (see Note 7)	31.4				31.4				32.6
Intangible assets, net (see Note 8)	1,206.0				1,206.0				1,246.1
Goodwill (see Note 8)	311.1	[3]			311.1	[3]			311.1	[3]
Consolidated Revenues and Expenses [Abstract]
Sales of natural gas	719.5		655.6		1,432.2		1,630.8
Midstream services	207.8		189.3		411.7		375.6
Total consolidated revenues	927.3		844.9		1,843.9		2,006.4
Onshore Crude Oil Pipelines and Services [Member]
Segment Gross Operating Margin [Abstract]
Revenues	4,281.6		2,629.3		7,652.2		5,015.9
Add: Equity in income of unconsolidated affiliates	(1.6)		3.6		(2.1)		5.9
Total segment gross operating margin	67.8		25.9		99.6		52.6
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	67.8		25.9		99.6		52.6
Information by business segment [Abstract]
Revenues from third parties	4,281.6		2,629.3		7,652.2		5,016.0
Revenues from related parties	0		0		0		(0.1)
Intersegment and intrasegment revenues	1,477.6		223.4		2,184.7		248.1
Total revenues	5,759.2		2,852.7		9,836.9		5,264.0
Equity in income (loss) of unconsolidated affiliates	(1.6)		3.6		(2.1)		5.9
Gross operating margin	67.8		25.9		99.6		52.6
Segment assets	923.6				923.6				917.5
Property, plant and equipment, net (see Note 6)	432.3				432.3				427.9
Investments in unconsolidated affiliates (see Note 7)	174.1				174.1				172.2
Intangible assets, net (see Note 8)	6.0				6.0				6.2
Goodwill (see Note 8)	311.2	[3]			311.2	[3]			311.2	[3]
Consolidated Revenues and Expenses [Abstract]
Sales of crude oil	4,257.9		2,603.4		7,606.1		4,970.7
Midstream services	23.7		25.9		46.1		45.2
Total consolidated revenues	4,281.6		2,629.3		7,652.2		5,015.9
Offshore Pipelines And Services [Member]
Segment Gross Operating Margin [Abstract]
Revenues	63.7		87.3		128.1		175.9
Add: Equity in income of unconsolidated affiliates	6.6		11.1		14.9		22.9
Total segment gross operating margin	53.4		82.8		114.7		163.9
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	53.4		82.8		114.7		163.9
Information by business segment [Abstract]
Revenues from third parties	61.1		85.5		121.7		172.0
Revenues from related parties	2.6		1.8		6.4		3.9
Intersegment and intrasegment revenues	0.1		0.3		1.8		0.7
Total revenues	63.8		87.6		129.9		176.6
Equity in income (loss) of unconsolidated affiliates	6.6		11.1		14.9		22.9
Gross operating margin	53.4		82.8		114.7		163.9
Segment assets	1,954.7				1,954.7				2,004.9
Property, plant and equipment, net (see Note 6)	1,355.7				1,355.7				1,390.9
Investments in unconsolidated affiliates (see Note 7)	434.0				434.0				443.2
Intangible assets, net (see Note 8)	82.9				82.9				88.7
Goodwill (see Note 8)	82.1	[3]			82.1	[3]			82.1	[3]
Consolidated Revenues and Expenses [Abstract]
Sales of natural gas	0.3		0.4		0.6		0.8
Sales of crude oil	2.5		1.9		5.8		4.0
Midstream services	60.9		85.0		121.7		171.1
Total consolidated revenues	63.7		87.3		128.1		175.9
Petrochemical and Refined Products Services [Member]
Segment Gross Operating Margin [Abstract]
Revenues	1,907.0		1,002.6		3,482.3		2,064.1
Add: Equity in income of unconsolidated affiliates	(4.3)		(2.6)		(9.3)		(5.3)
Total segment gross operating margin	139.8		158.1		252.2		278.1
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	139.8		158.1		252.2		278.1
Information by business segment [Abstract]
Revenues from third parties	1,907.0		1,002.6		3,482.3		2,064.1
Revenues from related parties	0		0		0		0
Intersegment and intrasegment revenues	445.5		287.2		918.6		545.0
Total revenues	2,352.5		1,289.8		4,400.9		2,609.1
Equity in income (loss) of unconsolidated affiliates	(4.3)		(2.6)		(9.3)		(5.3)
Gross operating margin	139.8		158.1		252.2		278.1
Segment assets	3,755.4				3,755.4				3,758.7
Property, plant and equipment, net (see Note 6)	2,508.6				2,508.6				2,498.8
Investments in unconsolidated affiliates (see Note 7)	72.9				72.9				76.8
Intangible assets, net (see Note 8)	112.4				112.4				121.0
Goodwill (see Note 8)	1,061.5	[3]			1,061.5	[3]			1,062.1	[3]
Consolidated Revenues and Expenses [Abstract]
Sales of other petroleum and related products	1,718.7		871.7		3,101.5		1,804.3
Midstream services	188.3		130.9		380.8		259.8
Total consolidated revenues	1,907.0		1,002.6		3,482.3		2,064.1
Other Investment [Member]
Segment Gross Operating Margin [Abstract]
Add: Equity in income of unconsolidated affiliates	2.7		(5.7)		9.0		4.9
Total segment gross operating margin	2.7		(5.7)		9.0		4.9
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	2.7		(5.7)		9.0		4.9
Information by business segment [Abstract]
Revenues from third parties	0		0		0		0
Revenues from related parties	0		0		0		0
Intersegment and intrasegment revenues	0		0		0		0
Total revenues	0		0		0		0
Equity in income (loss) of unconsolidated affiliates	2.7		(5.7)		9.0		4.9
Gross operating margin	2.7		(5.7)		9.0		4.9
Segment assets	1,241.8				1,241.8				1,436.8
Property, plant and equipment, net (see Note 6)	0				0				0
Investments in unconsolidated affiliates (see Note 7)	1,241.8				1,241.8				1,436.8
Intangible assets, net (see Note 8)	0				0				0
Goodwill (see Note 8)	0				0				0
Adjustments and Eliminations [Member]
Segment Gross Operating Margin [Abstract]
Add: Equity in income of unconsolidated affiliates	0		0		0		0
Total segment gross operating margin	0		0		0		0
Reconciliation of total Segment Gross Operating Margin [Abstract]
Total segment gross operating margin	0		0		0		0
Information by business segment [Abstract]
Revenues from third parties	0		0		0		0
Revenues from related parties	0		0		0		0
Intersegment and intrasegment revenues	(5,405.3)		(3,131.3)		(10,332.7)		(6,177.0)
Total revenues	(5,405.3)		(3,131.3)		(10,332.7)		(6,177.0)
Equity in income (loss) of unconsolidated affiliates	0		0		0		0
Gross operating margin	0		0		0		0
Segment assets	2,923.1				2,923.1				1,607.2
Property, plant and equipment, net (see Note 6)	2,923.1				2,923.1				1,607.2
Investments in unconsolidated affiliates (see Note 7)	0				0				0
Intangible assets, net (see Note 8)	0				0				0
Goodwill (see Note 8)	$ 0				$ 0				$ 0

[1] Amount is a component of "Depreciation, amortization and accretion" as presented on the Unaudited Condensed Statements of Consolidated Cash Flows.

[2] Amount is a component of "Gains from asset sales and related transactions" as presented on the Unaudited Condensed Statements of Consolidated Cash Flows.

[3] The total carrying amount of goodwill at June 30, 2011 and December 31, 2010 is presented net of $1.3 million of accumulated impairment charges.