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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Consolidated Revenues [Abstract]        
Total consolidated revenues $ 12,520.8 $ 11,149.3 $ 25,430.7 $ 22,532.4
Operating costs and expenses:        
Cost of sales 10,705.3 [1] 9,458.3 [1] 21,758.0 [1] 19,150.8 [1]
Other operating costs and expenses 624.5 [2] 586.4 [2] 1,231.7 [2] 1,090.4 [2]
Depreciation, amortization and accretion 312.4 289.7 613.8 566.5
Net losses (gains) attributable to asset sales and insurance recoveries (6.8) 5.7 (96.4) (58.2)
Non-cash asset impairment charges 3.7 27.1 12.5 38.1
General and administrative costs 47.7 45.5 100.9 95.0
Total consolidated costs and expenses 11,686.8 10,412.7 23,620.5 20,882.6
NGL Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of NGLs and related products 3,630.6 3,235.9 8,426.4 6,901.5
Midstream services 390.6 269.0 774.3 554.4
Total consolidated revenues 4,021.2 3,504.9 9,200.7 7,455.9
Operating costs and expenses:        
Non-cash asset impairment charges 2.8 8.7 5.4 9.7
Onshore Natural Gas Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of natural gas 787.0 723.9 1,740.2 1,363.4
Midstream services 254.0 233.6 505.4 471.8
Total consolidated revenues 1,041.0 957.5 2,245.6 1,835.2
Operating costs and expenses:        
Non-cash asset impairment charges 0.1 0 0.3 0
Onshore Crude Oil Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of crude oil 5,781.9 5,057.4 10,655.3 9,800.2
Midstream services 90.4 72.1 175.3 122.5
Total consolidated revenues 5,872.3 5,129.5 10,830.6 9,922.7
Operating costs and expenses:        
Non-cash asset impairment charges 0.8 16.6 1.8 16.6
Offshore Pipelines And Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of natural gas 0 0.1 0.2 0.2
Sales of crude oil 2.9 (0.1) 5.0 2.2
Midstream services 36.1 41.3 70.7 81.5
Total consolidated revenues 39.0 41.3 75.9 83.9
Petrochemical and Refined Products Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of petrochemicals and refined products 1,376.6 1,334.2 2,732.8 2,881.4
Midstream services 170.7 181.9 345.1 353.3
Total consolidated revenues 1,547.3 1,516.1 3,077.9 3,234.7
Operating costs and expenses:        
Non-cash asset impairment charges $ 0 $ 1.8 $ 5.0 $ 11.8
[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.