Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018		Jun. 30, 2017
Revenue [Abstract]
Revenues	$ 8,467.5	[1]	$ 6,607.6	[2]	$ 17,766.0	[1]	$ 13,928.0	[2]
Sales of Products [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	84.00%		84.00%		85.00%		85.00%
Midstream Services [Member]
Revenue [Abstract]
Percentage increase in revenues due to addition of revenue stream for non-cash consideration					2.00%
Midstream Services [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	16.00%		16.00%		15.00%		15.00%
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues	$ 3,273.7	[1]	$ 2,620.6	[2]	$ 6,687.0	[1]	$ 5,966.4	[2]
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues	2,610.9	[1]	2,158.0	[2]	5,426.3	[1]	5,045.2	[2]
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	662.8	[1]	462.6	[2]	1,260.7	[1]	921.2	[2]
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues	2,781.2	[1]	1,899.6	[2]	6,352.1	[1]	3,706.8	[2]
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues	2,532.2	[1]	1,705.1	[2]	5,873.9	[1]	3,323.7	[2]
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	249.0	[1]	194.5	[2]	478.2	[1]	383.1	[2]
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues	792.8	[1]	786.2	[2]	1,597.6	[1]	1,547.4	[2]
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues	532.5	[1]	560.6	[2]	1,092.5	[1]	1,104.6	[2]
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	260.3	[1]	225.6	[2]	505.1	[1]	442.8	[2]
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues	1,619.8	[1]	1,301.2	[2]	3,129.3	[1]	2,707.4	[2]
Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]
Revenue [Abstract]
Revenues	1,413.4	[1]	1,114.1	[2]	2,702.7	[1]	2,325.2	[2]
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	$ 206.4	[1]	$ 187.1	[2]	$ 426.6	[1]	$ 382.2	[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.