Business Segments, Consolidated Revenues and Expenses (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Consolidated Revenues [Abstract]
Total consolidated revenues		$ 9,182.3	$ 9,585.9	$ 8,467.5	$ 9,298.5	$ 8,426.6	$ 6,886.9	$ 6,607.6	$ 7,320.4	$ 36,534.2	[1]	$ 29,241.5	[2]	$ 23,022.3	[2]
Operating costs and expenses:
Cost of sales	[3]									26,789.8		21,487.0		15,710.9
Other operating costs and expenses	[4]									2,898.7		2,500.1		2,425.6
Depreciation, amortization and accretion										1,687.0		1,531.3		1,456.7
Asset impairment and related charges										50.5		49.8		52.8
Net gains attributable to asset sales										(28.7)		(10.7)		(2.5)
General and administrative costs										208.3		181.1		160.1
Total costs and expenses										$ 31,605.6		$ 25,738.6		$ 19,803.6
Vitol Holding B.V. [Member] | Revenues [Member]
Consolidated Revenues [Abstract]
Largest non-affiliated customer percentage										7.80%		11.20%		9.90%
NGL Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues										$ 15,648.9	[1]	$ 12,468.0	[2]	$ 10,242.5	[2]
Crude Oil Pipelines & Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues										11,042.6	[1]	8,156.8	[2]	6,515.0	[2]
Natural Gas Pipelines & Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues										3,454.4	[1]	3,145.6	[2]	2,543.0	[2]
Petrochemical and Refined Products Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues										$ 6,388.3	[1]	$ 5,471.1	[2]	$ 3,721.8	[2]

[1] Revenues are accounted for under ASC 606 upon implementation at January 1, 2018.

[2] Revenues are accounted for under ASC 605 for historical periods prior to January 1, 2018.

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

[4] Represents the cost of operating our plants, pipelines and other fixed assets excluding: depreciation, amortization and accretion charges; asset impairment and related charges; and net losses (or gains) attributable to asset sales and insurance recoveries.