Revenues, Revenues by Business Segment and Revenue Type (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
Revenue [Abstract]
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]
Percentage increase in revenues due to addition of revenue stream for non-cash consideration									2.00%
Sales of Products [Member] | Revenues [Member]
Revenue [Abstract]
Concentration risk percentage									84.00%		85.00%		81.00%
Midstream Services [Member] | Revenues [Member]
Revenue [Abstract]
Concentration risk percentage									16.00%		15.00%		19.00%
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues									$ 15,648.9	[1]	$ 12,468.0	[2]	$ 10,242.5	[2]
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues									12,920.9	[1]	10,521.3	[2]	8,380.5	[2]
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues									2,728.0	[1]	1,946.7	[2]	1,862.0	[2]
NGL Pipelines & Services [Member] | Midstream Services: Natural Gas Processing and Fractionation [Member]
Revenue [Abstract]
Revenues									1,341.0	[1]	719.1	[2]	714.6	[2]
NGL Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues									1,007.0	[1]	891.7	[2]	885.6	[2]
NGL Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues									380.0	[1]	335.9	[2]	261.8	[2]
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues									11,042.6	[1]	8,156.8	[2]	6,515.0	[2]
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues									10,001.2	[1]	7,365.2	[2]	5,802.5	[2]
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues									1,041.4	[1]	791.6	[2]	712.5	[2]
Crude Oil Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues									676.5	[1]	473.9	[2]	411.1	[2]
Crude Oil Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues									364.9	[1]	317.7	[2]	301.4	[2]
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues									3,454.4	[1]	3,145.6	[2]	2,543.0	[2]
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues									2,411.7	[1]	2,238.5	[2]	1,591.9	[2]
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues									1,042.7	[1]	907.1	[2]	951.1	[2]
Natural Gas Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues									1,042.7	[1]	907.1	[2]	951.1	[2]
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues									6,388.3	[1]	5,471.1	[2]	3,721.8	[2]
Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]
Revenue [Abstract]
Revenues									5,535.4	[1]	4,696.3	[2]	2,921.9	[2]
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues									852.9	[1]	774.8	[2]	799.9	[2]
Petrochemical & Refined Products Services [Member] | Midstream Services: Fractionation and Isomerization [Member]
Revenue [Abstract]
Revenues									188.3	[1]	156.3	[2]	142.6	[2]
Petrochemical & Refined Products Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues									481.8	[1]	430.7	[2]	456.2	[2]
Petrochemical & Refined Products Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues									$ 182.8	[1]	$ 187.8	[2]	$ 201.1	[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.