Business Segments, Consolidated Revenues and Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Consolidated Revenues [Abstract]
Total consolidated revenues	$ 12,909.9		$ 11,383.1
Operating costs and expenses:
Cost of sales	11,052.7	[1]	9,692.5	[1]
Other operating costs and expenses	607.2	[2]	504.0	[2]
Depreciation, amortization and accretion	301.4		276.8
Net gains attributable to asset sales and insurance recoveries	(89.6)		(63.9)
Non-cash asset impairment charges	8.8		11.0
General and administrative costs	53.2		49.5
Total consolidated costs and expenses	11,933.7		10,469.9
NGL Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Sales of NGLs and related products	4,795.8		3,665.6
Midstream services	383.7		285.4
Total consolidated revenues	5,179.5		3,951.0
Operating costs and expenses:
Non-cash asset impairment charges	2.6		1.0
Onshore Natural Gas Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Sales of natural gas	953.2		639.5
Midstream services	251.4		238.2
Total consolidated revenues	1,204.6		877.7
Operating costs and expenses:
Non-cash asset impairment charges	0.2		0
Onshore Crude Oil Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Sales of crude oil	4,873.4		4,742.8
Midstream services	84.9		50.4
Total consolidated revenues	4,958.3		4,793.2
Operating costs and expenses:
Non-cash asset impairment charges	1.0		0
Offshore Pipelines And Services [Member]
Consolidated Revenues [Abstract]
Sales of natural gas	0.2		0.1
Sales of crude oil	2.1		2.3
Midstream services	34.6		40.2
Total consolidated revenues	36.9		42.6
Petrochemical and Refined Products Services [Member]
Consolidated Revenues [Abstract]
Sales of petrochemicals and refined products	1,356.2		1,547.2
Midstream services	174.4		171.4
Total consolidated revenues	1,530.6		1,718.6
Operating costs and expenses:
Non-cash asset impairment charges	$ 5.0		$ 10.0

[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.