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Business Segments, Consolidated Revenues and Expenses (Details) - Consolidation Items [Domain] - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2015

Jun. 30, 2014

Jun. 30, 2015

Jun. 30, 2014

Consolidated Revenues [Abstract]

Total consolidated revenues

$ 7,092.5

$ 12,520.8

$ 14,565.0

$ 25,430.7

Operating costs and expenses:

Cost of sales

^[1]

5,257.9

10,705.3

10,936.0

21,758.0

Other operating costs and expenses

^[2]

632.5

624.5

1,192.3

1,231.7

Depreciation, amortization and accretion

385.6

312.4

730.9

613.8

Net losses (gains) attributable to asset sales and insurance recoveries

2.5

(6.8)

2.4

(96.4)

Non-cash asset impairment charges

79.0

3.7

112.3

12.5

General and administrative costs

44.9

47.7

94.2

100.9

Total consolidated costs and expenses

6,402.4

11,686.8

13,068.1

23,620.5

NGL Pipelines and Services [Member]

Consolidated Revenues [Abstract]

Sales of NGLs and related products

1,849.1

3,630.6

4,091.3

8,426.4

Midstream services

417.0

390.6

851.1

774.3

Total consolidated revenues

2,266.1

4,021.2

4,942.4

9,200.7

Crude Oil Pipelines & Services [Member]

Consolidated Revenues [Abstract]

Sales of crude oil

2,971.3

5,781.9

5,542.0

10,655.3

Midstream services

117.1

90.4

224.4

175.3

Total consolidated revenues

3,088.4

5,872.3

5,766.4

10,830.6

Natural Gas Pipelines & Services [Member]

Consolidated Revenues [Abstract]

Sales of natural gas

429.9

787.0

906.2

1,740.2

Midstream services

254.8

254.0

512.4

505.4

Total consolidated revenues

684.7

1,041.0

1,418.6

2,245.6

Petrochemical and Refined Products Services [Member]

Consolidated Revenues [Abstract]

Sales of petrochemicals and refined products

832.7

1,376.6

1,983.7

2,732.8

Midstream services

185.8

170.7

383.9

345.1

Total consolidated revenues

1,018.5

1,547.3

2,367.6

3,077.9

Offshore Pipelines And Services [Member]

Consolidated Revenues [Abstract]

Sales of natural gas

0.0

0.0

0.0

0.2

Sales of crude oil

1.7

2.9

2.8

5.0

Midstream services

33.1

36.1

67.2

70.7

Total consolidated revenues

$ 34.8

$ 39.0

$ 70.0

$ 75.9

[1]	Cost of sales is a component of "Operating costs and expenses" as presented on our Unaudited Condensed Statements of Consolidated Operations. Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.
[2]	Represents cost of operating our plants, pipelines and other fixed assets, excluding depreciation, amortization and accretion charges.

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