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Revenues, Revenues by Business Segment and Revenue Type (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2018

Sep. 30, 2017

Sep. 30, 2018

Sep. 30, 2017

Revenue [Abstract]

Revenues

$ 9,585.9

^[1]

$ 6,886.9

^[2]

$ 27,351.9

^[1]

$ 20,814.9

^[2]

Percentage increase in revenues due to addition of revenue stream for non-cash consideration

2.00%

Sales of Products [Member] | Revenues [Member] | Product Concentration Risk [Member]

Revenue [Abstract]

Concentration risk percentage

85.00%

84.00%

85.00%

84.00%

Midstream Services [Member] | Revenues [Member] | Product Concentration Risk [Member]

Revenue [Abstract]

Concentration risk percentage

15.00%

16.00%

15.00%

16.00%

NGL Pipelines & Services [Member]

Revenue [Abstract]

Revenues

$ 4,622.9

^[1]

$ 2,914.3

^[2]

$ 11,309.9

^[1]

$ 8,880.7

^[2]

NGL Pipelines & Services [Member] | Sales of NGLs and Related Products [Member]

Revenue [Abstract]

Revenues

3,898.2

^[1]

2,415.3

^[2]

9,324.5

^[1]

7,460.5

^[2]

NGL Pipelines & Services [Member] | Midstream Services [Member]

Revenue [Abstract]

Revenues

724.7

^[1]

499.0

^[2]

1,985.4

^[1]

1,420.2

^[2]

Crude Oil Pipelines & Services [Member]

Revenue [Abstract]

Revenues

2,494.9

^[1]

1,796.7

^[2]

8,847.0

^[1]

5,503.5

^[2]

Crude Oil Pipelines & Services [Member] | Sales of Crude Oil [Member]

Revenue [Abstract]

Revenues

2,209.0

^[1]

1,589.0

^[2]

8,082.9

^[1]

4,912.7

^[2]

Crude Oil Pipelines & Services [Member] | Midstream Services [Member]

Revenue [Abstract]

Revenues

285.9

^[1]

207.7

^[2]

764.1

^[1]

590.8

^[2]

Natural Gas Pipelines & Services [Member]

Revenue [Abstract]

Revenues

850.2

^[1]

796.6

^[2]

2,447.8

^[1]

2,344.0

^[2]

Natural Gas Pipelines & Services [Member] | Sales of Natural Gas [Member]

Revenue [Abstract]

Revenues

589.0

^[1]

568.9

^[2]

1,681.5

^[1]

1,673.5

^[2]

Natural Gas Pipelines & Services [Member] | Midstream Services [Member]

Revenue [Abstract]

Revenues

261.2

^[1]

227.7

^[2]

766.3

^[1]

670.5

^[2]

Petrochemical & Refined Products Services [Member]

Revenue [Abstract]

Revenues

1,617.9

^[1]

1,379.3

^[2]

4,747.2

^[1]

4,086.7

^[2]

Petrochemical & Refined Products Services [Member] | Sales of Petrochemicals and Refined Products [Member]

Revenue [Abstract]

Revenues

1,408.9

^[1]

1,194.2

^[2]

4,111.6

^[1]

3,519.4

^[2]

Petrochemical & Refined Products Services [Member] | Midstream Services [Member]

Revenue [Abstract]

Revenues

$ 209.0

^[1]

$ 185.1

^[2]

$ 635.6

^[1]

$ 567.3

^[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.

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