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Business Segments, Consolidated Revenues and Expenses (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Consolidated Revenues [Abstract]        
Total consolidated revenues $ 11,149.3 $ 9,789.8 $ 22,532.4 $ 21,042.3
Operating costs and expenses:        
Cost of sales 9,458.3 [1] 8,195.2 [1] 19,150.8 [1] 17,861.0 [1]
Other operating costs and expenses 586.4 [2] 572.9 [2] 1,090.4 [2] 1,116.8 [2]
Depreciation, amortization and accretion 289.7 261.3 566.5 515.9
Losses (gains) attributable to asset sales and insurance recoveries 5.7 (29.0) (58.2) (31.5)
Non-cash asset impairment charges 27.1 9.1 38.1 14.5
General and administrative costs 45.5 42.5 95.0 88.8
Total consolidated costs and expenses 10,412.7 9,052.0 20,882.6 19,565.5
NGL Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of NGLs and related products 3,235.9 3,133.9 6,901.5 7,249.2
Midstream asset services 269.0 198.6 554.4 437.8
Total consolidated revenues 3,504.9 3,332.5 7,455.9 7,687.0
Onshore Natural Gas Pipelines And Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of natural gas 723.9 510.8 1,363.4 1,083.4
Midstream asset services 233.6 209.6 471.8 470.6
Total consolidated revenues 957.5 720.4 1,835.2 1,554.0
Onshore Crude Oil Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of crude oil 5,057.4 4,174.0 9,800.2 8,621.6
Midstream asset services 72.1 14.7 122.5 40.7
Total consolidated revenues 5,129.5 4,188.7 9,922.7 8,662.3
Offshore Pipelines And Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of natural gas 0.1 0 0.2 0.1
Sales of crude oil (0.1) 0 2.2 1.4
Midstream asset services 41.3 49.0 81.5 103.6
Total consolidated revenues 41.3 49.0 83.9 105.1
Petrochemical and Refined Products Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of petrochemicals and refined products 1,334.2 1,316.8 2,881.4 2,668.0
Midstream asset services 181.9 182.4 353.3 365.9
Total consolidated revenues $ 1,516.1 $ 1,499.2 $ 3,234.7 $ 3,033.9
[1] Cost of sales is a component of "Operating costs and expenses," as presented on our Unaudited Condensed Statements of Consolidated Operations. Period-to-period 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.