Business Segments, Consolidated Revenues and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Consolidated Revenues [Abstract]
Total consolidated revenues	$ 11,383.1		$ 11,252.5
Operating costs and expenses:
Cost of sales	9,692.5	[1]	9,665.8	[1]
Other operating costs and expenses	504.0	[2]	543.9	[2]
Depreciation, amortization and accretion	276.8		254.6
Gains attributable to asset sales and insurance recoveries	(63.9)		(2.5)
Non-cash asset impairment charges	11.0		5.4
General and administrative costs	49.5		46.3
Total consolidated costs and expenses	10,469.9		10,513.5
NGL Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Sales of NGLs and related products	3,665.6		4,115.3
Midstream services	285.4		239.2
Total consolidated revenues	3,951.0		4,354.5
Onshore Natural Gas Pipelines And Services [Member]
Consolidated Revenues [Abstract]
Sales of natural gas	639.5		572.6
Midstream services	238.2		261.0
Total consolidated revenues	877.7		833.6
Onshore Crude Oil Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Sales of crude oil	4,742.8		4,447.6
Midstream services	50.4		26.0
Total consolidated revenues	4,793.2		4,473.6
Offshore Pipelines And Services [Member]
Consolidated Revenues [Abstract]
Sales of natural gas	0.1		0.1
Sales of crude oil	2.3		1.4
Midstream services	40.2		54.6
Total consolidated revenues	42.6		56.1
Petrochemical and Refined Products Services [Member]
Consolidated Revenues [Abstract]
Sales of petrochemicals and refined products	1,547.2		1,351.2
Midstream services	171.4		183.5
Total consolidated revenues	$ 1,718.6		$ 1,534.7

[1] Cost of sales is a component of "Operating costs and expenses," as presented on our Unaudited Condensed Statements of Consolidated Operations. Quarter-to-quarter 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.