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Business Segments, Consolidated Revenues and Expenses (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2015

Sep. 30, 2014

Consolidated Revenues [Abstract]

Total consolidated revenues

$ 6,307.9

$ 12,330.2

$ 20,872.9

$ 37,760.9

Operating costs and expenses:

Cost of sales

^[1]

4,419.9

10,455.1

15,355.9

32,213.1

Other operating costs and expenses

^[2]

642.5

633.9

1,834.8

1,865.6

Depreciation, amortization and accretion

351.1

322.7

1,082.0

936.5

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

12.3

(2.6)

14.7

(99.0)

Non-cash asset impairment charges

26.8

5.7

139.1

18.2

General and administrative costs

49.0

50.0

143.2

150.9

Total consolidated costs and expenses

5,501.6

11,464.8

18,569.7

35,085.3

NGL Pipelines and Services [Member]

Consolidated Revenues [Abstract]

Sales of NGLs and related products

1,844.9

3,603.4

5,936.2

12,029.8

Midstream services

441.9

423.3

1,293.0

1,197.6

Total consolidated revenues

2,286.8

4,026.7

7,229.2

13,227.4

Crude Oil Pipelines & Services [Member]

Consolidated Revenues [Abstract]

Sales of crude oil

2,147.3

5,348.2

7,689.3

16,003.5

Midstream services

175.3

88.9

399.7

264.2

Total consolidated revenues

2,322.6

5,437.1

8,089.0

16,267.7

Natural Gas Pipelines & Services [Member]

Consolidated Revenues [Abstract]

Sales of natural gas

455.0

775.5

1,361.2

2,515.7

Midstream services

254.7

256.4

767.1

761.8

Total consolidated revenues

709.7

1,031.9

2,128.3

3,277.5

Petrochemical and Refined Products Services [Member]

Consolidated Revenues [Abstract]

Sales of petrochemicals and refined products

780.5

1,605.4

2,764.2

4,338.2

Midstream services

199.5

186.6

583.4

531.7

Total consolidated revenues

980.0

1,792.0

3,347.6

4,869.9

Offshore Pipelines And Services [Member]

Consolidated Revenues [Abstract]

Sales of natural gas

0.0

0.0

0.0

0.2

Sales of crude oil

0.4

2.5

3.2

7.5

Midstream services

8.4

40.0

75.6

110.7

Total consolidated revenues

$ 8.8

$ 42.5

$ 78.8

$ 118.4

[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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