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Business Segments, Consolidated Revenues and Expenses (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues | $ 11,072.1 | $ 10,468.7 | $ 9,789.8 | $ 11,252.5 | $ 11,585.7 | $ 11,327.1 | $ 11,216.5 | $ 10,183.7 | $ 42,583.1 |  | $ 44,313.0 |  | $ 33,739.3 |
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 36,015.5 | [1] | 38,292.6 | [1] | 28,723.1 | [1]
Other operating costs and expenses |  |  |  |  |  |  |  |  | 2,244.9 | [2] | 2,195.4 | [2] | 1,825.9 | [2]
Depreciation, amortization and accretion |  |  |  |  |  |  |  |  | 1,061.7 |  | 958.7 |  | 936.3 |
Gains attributable to disposal of assets |  |  |  |  |  |  |  |  | (17.6) |  | (156.0) |  | (44.4) |
Non-cash asset impairment charges |  |  |  |  |  |  |  |  | 63.4 |  | 27.8 |  | 8.4 |
General and administrative costs |  |  |  |  |  |  |  |  | 170.3 |  | 181.8 |  | 204.8 |
Total costs and expenses |  |  |  |  |  |  |  |  | 39,538.2 |  | 41,500.3 |  | 31,654.1 |
NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of NGLs and related products |  |  |  |  |  |  |  |  | 14,218.5 |  | 16,724.6 |  | 13,449.4 |
Midstream services |  |  |  |  |  |  |  |  | 949.9 |  | 758.7 |  | 753.1 |
Total consolidated revenues |  |  |  |  |  |  |  |  | 15,168.4 |  | 17,483.3 |  | 14,202.5 |
Onshore Natural Gas Pipelines And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of natural gas |  |  |  |  |  |  |  |  | 2,395.4 |  | 2,866.5 |  | 2,928.7 |
Midstream services |  |  |  |  |  |  |  |  | 957.2 |  | 863.7 |  | 772.9 |
Total consolidated revenues |  |  |  |  |  |  |  |  | 3,352.6 |  | 3,730.2 |  | 3,701.6 |
Onshore Crude Oil Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of crude oil |  |  |  |  |  |  |  |  | 17,548.7 |  | 15,962.6 |  | 10,710.4 |
Midstream services |  |  |  |  |  |  |  |  | 113.0 |  | 98.5 |  | 84.4 |
Total consolidated revenues |  |  |  |  |  |  |  |  | 17,661.7 |  | 16,061.1 |  | 10,794.8 |
Offshore Pipelines And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of natural gas |  |  |  |  |  |  |  |  | 0.4 |  | 1.1 |  | 1.3 |
Sales of crude oil |  |  |  |  |  |  |  |  | 3.3 |  | 9.4 |  | 9.5 |
Midstream services |  |  |  |  |  |  |  |  | 187.8 |  | 245.5 |  | 299.9 |
Total consolidated revenues |  |  |  |  |  |  |  |  | 191.5 |  | 256.0 |  | 310.7 |
Petrochemical and Refined Products Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales of petrochemicals and refined products |  |  |  |  |  |  |  |  | 5,470.9 |  | 6,000.6 |  | 4,009.1 |
Midstream services |  |  |  |  |  |  |  |  | 738.0 |  | 781.8 |  | 720.6 |
Total consolidated revenues |  |  |  |  |  |  |  |  | $ 6,208.9 |  | $ 6,782.4 |  | $ 4,729.7 |
[1] | Cost of sales is a component of "Operating costs and expenses," as presented on our Statements of Consolidated Operations. Year-to-year 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 non-cash depreciation, amortization and accretion charges.

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