Business Segments, Consolidated Revenues and Expenses (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Revenues [Abstract]
Total consolidated revenues		$ 27,199.7	$ 32,789.2	$ 36,534.2
Operating costs and expenses:
Cost of sales	[1]	16,723.2	22,065.8	26,789.8
Other operating costs and expenses	[2]	2,800.2	3,020.7	2,898.7
Depreciation, amortization and accretion		1,961.5	1,848.3	1,687.0
Impairment of goodwill		296.3	0.0	0.0
Impairment of assets other than goodwill		594.3	132.7	50.5
Net gains attributable to asset sales		(4.4)	(5.7)	(28.7)
General and administrative costs		219.6	211.7	208.3
Total costs and expenses		22,590.7	27,273.5	31,605.6
Vitol Holding B.V. [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues			$ 3,314.8
Revenues [Member] | Vitol Holding B.V. [Member]
Consolidated Revenues [Abstract]
Percent of revenues			10.10%
NGL Pipelines and Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		11,177.2	$ 13,470.7	15,648.9
Operating costs and expenses:
Impairment of goodwill		0.0
NGL Pipelines and Services [Member] | Vitol Holding B.V. [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues			1,410.8
Crude Oil Pipelines & Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		6,689.0	10,287.3	11,042.6
Operating costs and expenses:
Impairment of goodwill		0.0
Crude Oil Pipelines & Services [Member] | Vitol Holding B.V. [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues			1,670.7
Natural Gas Pipelines & Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		2,553.1	3,169.4	3,454.4
Operating costs and expenses:
Impairment of goodwill		296.3
Natural Gas Pipelines & Services [Member] | Vitol Holding B.V. [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues			31.2
Petrochemical and Refined Products Services [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues		6,780.4	5,861.8	$ 6,388.3
Operating costs and expenses:
Impairment of goodwill		$ 0.0
Petrochemical and Refined Products Services [Member] | Vitol Holding B.V. [Member]
Consolidated Revenues [Abstract]
Total consolidated revenues			$ 202.1

[1] 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.

[2] 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.