Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue [Abstract]
Revenues	$ 27,199.7	$ 32,789.2	$ 36,534.2
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues	11,177.2	13,470.7	15,648.9
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues	8,970.7	10,934.3	12,920.9
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	2,206.5	2,536.4	2,728.0
NGL Pipelines & Services [Member] | Midstream Services: Natural Gas Processing and Fractionation [Member]
Revenue [Abstract]
Revenues	757.3	1,069.9	1,341.0
NGL Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	1,036.8	1,054.3	1,007.0
NGL Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	412.4	412.2	380.0
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues	6,689.0	10,287.3	11,042.6
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues	5,410.8	9,007.8	10,001.2
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	1,278.2	1,279.5	1,041.4
Crude Oil Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	804.9	801.8	676.5
Crude Oil Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	473.3	477.7	364.9
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues	2,553.1	3,169.4	3,454.4
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues	1,530.5	2,075.4	2,411.7
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	1,022.6	1,094.0	1,042.7
Natural Gas Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	1,022.6	1,094.0	1,042.7
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues	6,780.4	5,861.8	6,388.3
Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]
Revenue [Abstract]
Revenues	5,942.6	4,985.2	5,535.4
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	837.8	876.6	852.9
Petrochemical & Refined Products Services [Member] | Midstream Services: Fractionation and Isomerization [Member]
Revenue [Abstract]
Revenues	187.7	166.6	188.3
Petrochemical & Refined Products Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	482.9	539.4	481.8
Petrochemical & Refined Products Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	$ 167.2	$ 170.6	$ 182.8