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Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue [Abstract]
Revenues	$ 7,964.1	$ 9,585.9	$ 24,783.9	$ 27,351.9
Sales of Products [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	82.00%	85.00%	82.00%	85.00%
Midstream Services [Member] | Revenues [Member] | Product Concentration Risk [Member]
Revenue [Abstract]
Concentration risk percentage	18.00%	15.00%	18.00%	15.00%
NGL Pipelines & Services [Member]
Revenue [Abstract]
Revenues	$ 3,252.1	$ 4,622.9	$ 9,851.2	$ 11,309.9
NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]
Revenue [Abstract]
Revenues	2,624.9	3,898.2	7,955.5	9,324.5
NGL Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	627.2	724.7	1,895.7	1,985.4
NGL Pipelines & Services [Member] | Midstream Services: Natural Gas Processing and Fractionation [Member]
Revenue [Abstract]
Revenues	279.6	397.2	837.3	982.2
NGL Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	248.2	241.8	767.4	725.5
NGL Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	99.4	85.7	291.0	277.7
Crude Oil Pipelines & Services [Member]
Revenue [Abstract]
Revenues	2,478.3	2,494.9	7,952.2	8,847.0
Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]
Revenue [Abstract]
Revenues	2,130.0	2,209.0	6,990.1	8,082.9
Crude Oil Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	348.3	285.9	962.1	764.1
Crude Oil Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	209.1	187.9	598.1	490.7
Crude Oil Pipelines & Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	139.2	98.0	364.0	273.4
Natural Gas Pipelines & Services [Member]
Revenue [Abstract]
Revenues	715.5	850.2	2,462.3	2,447.8
Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]
Revenue [Abstract]
Revenues	440.0	589.0	1,627.1	1,681.5
Natural Gas Pipelines & Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	275.5	261.2	835.2	766.3
Natural Gas Pipelines & Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	275.5	261.2	835.2	766.3
Petrochemical & Refined Products Services [Member]
Revenue [Abstract]
Revenues	1,518.2	1,617.9	4,518.2	4,747.2
Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]
Revenue [Abstract]
Revenues	1,299.0	1,408.9	3,867.3	4,111.6
Petrochemical & Refined Products Services [Member] | Midstream Services [Member]
Revenue [Abstract]
Revenues	219.2	209.0	650.9	635.6
Petrochemical & Refined Products Services [Member] | Midstream Services: Fractionation and Isomerization [Member]
Revenue [Abstract]
Revenues	43.2	45.9	125.5	146.8
Petrochemical & Refined Products Services [Member] | Midstream Services: Transportation [Member]
Revenue [Abstract]
Revenues	134.4	119.2	393.2	353.0
Petrochemical & Refined Products Services [Member] | Midstream Services: Storage and Terminals [Member]
Revenue [Abstract]
Revenues	$ 41.6	$ 43.9	$ 132.2	$ 135.8

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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