Business Segments, Consolidated Revenues and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Consolidated Revenues [Abstract]
Total consolidated revenues	$ 12,093.3		$ 10,468.7		$ 34,625.7		$ 31,511.0
Operating costs and expenses:
Cost of sales	10,371.3	[1]	8,794.0	[1]	29,522.1	[1]	26,655.0	[1]
Other operating costs and expenses	612.0	[2]	556.1	[2]	1,702.4	[2]	1,672.9	[2]
Depreciation, amortization and accretion	285.2		269.2		851.7		785.1
Gains attributable to asset sales and insurance recoveries	(10.2)		(2.6)		(68.4)		(34.1)
Non-cash asset impairment charges	15.2		43.1		53.3		57.6
General and administrative costs	43.9		41.4		138.9		130.2
Total consolidated costs and expenses	11,317.4		9,701.2		32,200.0		29,266.7
NGL Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Sales of NGLs and related products	3,929.8		3,151.9		10,831.3		10,401.1
Midstream asset services	300.9		239.9		855.3		677.7
Total consolidated revenues	4,230.7		3,391.8		11,686.6		11,078.8
Onshore Natural Gas Pipelines And Services [Member]
Consolidated Revenues [Abstract]
Sales of natural gas	590.7		608.2		1,954.1		1,691.6
Midstream asset services	244.8		238.3		716.6		708.9
Total consolidated revenues	835.5		846.5		2,670.7		2,400.5
Onshore Crude Oil Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Sales of crude oil	5,359.7		4,471.8		15,159.9		13,093.4
Midstream asset services	77.8		33.4		200.3		74.1
Total consolidated revenues	5,437.5		4,505.2		15,360.2		13,167.5
Offshore Pipelines And Services [Member]
Consolidated Revenues [Abstract]
Sales of natural gas	0.1		0.2		0.3		0.3
Sales of crude oil	1.5		3.1		3.7		4.5
Midstream asset services	38.0		41.9		119.5		145.5
Total consolidated revenues	39.6		45.2		123.5		150.3
Petrochemical and Refined Products Services [Member]
Consolidated Revenues [Abstract]
Sales of petrochemicals and refined products	1,390.1		1,498.9		4,271.5		4,166.9
Midstream asset services	159.9		181.1		513.2		547.0
Total consolidated revenues	$ 1,550.0		$ 1,680.0		$ 4,784.7		$ 4,713.9

[1] Cost of sales is a component of "Operating costs and expenses," as presented on our Unaudited Condensed Statements of Consolidated Operations. Period-to-period fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.

[2] Represents cost of operating our plants, pipelines and other fixed assets, excluding depreciation, amortization and accretion charges.