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Business Segments, Consolidated Revenues and Expenses (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Consolidated Revenues [Abstract]        
Total consolidated revenues $ 12,330.2 $ 12,093.3 $ 37,760.9 $ 34,625.7
Operating costs and expenses:        
Cost of sales 10,455.1 [1] 10,371.3 [1] 32,213.1 [1] 29,522.1 [1]
Other operating costs and expenses 633.9 [2] 612.0 [2] 1,865.6 [2] 1,702.4 [2]
Depreciation, amortization and accretion 322.7 285.2 936.5 851.7
Net gains attributable to asset sales and insurance recoveries (2.6) (10.2) (99.0) (68.4)
Non-cash asset impairment charges 5.7 15.2 18.2 53.3
General and administrative costs 50.0 43.9 150.9 138.9
Total consolidated costs and expenses 11,464.8 11,317.4 35,085.3 32,200.0
NGL Pipelines and Services [Member]
        
Operating costs and expenses:        
Non-cash asset impairment charges 1.2 0.3 6.6 10.0
Onshore Natural Gas Pipelines and Services [Member]
        
Operating costs and expenses:        
Non-cash asset impairment charges 0.4 0 0.7 0
Onshore Crude Oil Pipelines and Services [Member]
        
Operating costs and expenses:        
Non-cash asset impairment charges 0.4 0 2.2 16.6
Offshore Pipelines And Services [Member]
        
Operating costs and expenses:        
Non-cash asset impairment charges 0 13.2 0 13.2
Petrochemical and Refined Products Services [Member]
        
Operating costs and expenses:        
Non-cash asset impairment charges 3.7 1.7 8.7 13.5
Reportable Business Segments [Member] | NGL Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of NGLs and related products 3,603.4 3,929.8 12,029.8 10,831.3
Midstream services 423.3 300.9 1,197.6 855.3
Total consolidated revenues 4,026.7 4,230.7 13,227.4 11,686.6
Reportable Business Segments [Member] | Onshore Natural Gas Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of natural gas 775.5 590.7 2,515.7 1,954.1
Midstream services 256.4 244.8 761.8 716.6
Total consolidated revenues 1,031.9 835.5 3,277.5 2,670.7
Reportable Business Segments [Member] | Onshore Crude Oil Pipelines and Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of crude oil 5,348.2 5,359.7 16,003.5 15,159.9
Midstream services 88.9 77.8 264.2 200.3
Total consolidated revenues 5,437.1 5,437.5 16,267.7 15,360.2
Reportable Business Segments [Member] | Offshore Pipelines And Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of natural gas 0 0.1 0.2 0.3
Sales of crude oil 2.5 1.5 7.5 3.7
Midstream services 40.0 38.0 110.7 119.5
Total consolidated revenues 42.5 39.6 118.4 123.5
Reportable Business Segments [Member] | Petrochemical and Refined Products Services [Member]
        
Consolidated Revenues [Abstract]        
Sales of petrochemicals and refined products 1,605.4 1,390.1 4,338.2 4,271.5
Midstream services 186.6 159.9 531.7 513.2
Total consolidated revenues $ 1,792.0 $ 1,550.0 $ 4,869.9 $ 4,784.7
[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.