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Business Segments, Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Information by business segment [Abstract]          
Revenues from third parties $ 5,604.6 $ 7,085.2 $ 10,594.3 $ 14,551.6  
Revenues from related parties 13.2 7.3 28.8 13.4  
Intersegment and intrasegment revenues 0.0 0.0 0.0 0.0  
Total revenues 5,617.8 7,092.5 10,623.1 14,565.0  
Equity in income (loss) of unconsolidated affiliates 76.4 110.2 177.5 199.4  
Gross operating margin 1,249.4 1,303.2 2,567.9 2,637.6  
Property, plant and equipment, net 33,011.5   33,011.5   $ 32,034.7
Investments in unconsolidated affiliates 2,669.4   2,669.4   2,628.5
Intangible assets, net 3,948.3   3,948.3   4,037.2
Goodwill 5,745.2   5,745.2   5,745.2
Segment assets 45,374.4   45,374.4   44,445.6
NGL Pipelines & Services [Member]          
Information by business segment [Abstract]          
Total revenues 2,515.5 2,266.1 4,919.3 4,942.4  
Equity in income (loss) of unconsolidated affiliates 14.0 12.5 29.1 24.1  
Intangible assets, net 365.3   365.3   380.3
Goodwill 2,651.7   2,651.7   2,651.7
Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Total revenues 1,660.0 3,088.4 2,948.6 5,766.4  
Equity in income (loss) of unconsolidated affiliates 65.8 79.4 155.9 139.3  
Intangible assets, net 2,325.0   2,325.0   2,377.5
Goodwill 1,841.0   1,841.0   1,841.0
Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Total revenues 535.7 684.7 1,085.7 1,418.6  
Equity in income (loss) of unconsolidated affiliates 0.9 1.0 1.9 1.9  
Intangible assets, net 1,070.8   1,070.8   1,087.7
Goodwill 296.3   296.3   296.3
Petrochemical & Refined Products Services [Member]          
Information by business segment [Abstract]          
Total revenues 906.6 1,018.5 1,669.5 2,367.6  
Equity in income (loss) of unconsolidated affiliates (4.3) (3.7) (9.4) (7.1)  
Intangible assets, net 187.2   187.2   191.7
Goodwill 956.2   956.2   956.2
Offshore Pipelines & Services [Member]          
Information by business segment [Abstract]          
Total revenues 0.0 34.8 0.0 70.0  
Equity in income (loss) of unconsolidated affiliates 0.0 21.0 0.0 41.2  
Reportable Business Segments [Member] | NGL Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 2,512.7 2,263.8 4,914.7 4,938.6  
Revenues from related parties 2.8 2.3 4.6 3.8  
Intersegment and intrasegment revenues 4,880.8 2,781.0 8,055.6 5,224.1  
Total revenues 7,396.3 5,047.1 12,974.9 10,166.5  
Equity in income (loss) of unconsolidated affiliates 14.0 12.5 29.1 24.1  
Gross operating margin 719.1 650.6 1,502.8 1,345.8  
Property, plant and equipment, net 13,297.2   13,297.2   12,909.7
Investments in unconsolidated affiliates 745.7   745.7   718.7
Intangible assets, net 365.3   365.3   380.3
Goodwill 2,651.7   2,651.7   2,651.7
Segment assets 17,059.9   17,059.9   16,660.4
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 1,651.4 3,087.0 2,928.9 5,764.0  
Revenues from related parties 8.6 1.4 19.7 2.4  
Intersegment and intrasegment revenues 2,445.7 1,539.7 3,945.1 2,816.8  
Total revenues 4,105.7 4,628.1 6,893.7 8,583.2  
Equity in income (loss) of unconsolidated affiliates 65.8 79.4 155.9 139.3  
Gross operating margin 177.4 235.6 379.7 449.6  
Property, plant and equipment, net 4,060.1   4,060.1   3,550.3
Investments in unconsolidated affiliates 1,827.2   1,827.2   1,813.4
Intangible assets, net 2,325.0   2,325.0   2,377.5
Goodwill 1,841.0   1,841.0   1,841.0
Segment assets 10,053.3   10,053.3   9,582.2
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 533.9 681.4 1,081.2 1,412.3  
Revenues from related parties 1.8 3.3 4.5 6.3  
Intersegment and intrasegment revenues 146.9 169.5 271.6 339.5  
Total revenues 682.6 854.2 1,357.3 1,758.1  
Equity in income (loss) of unconsolidated affiliates 0.9 1.0 1.9 1.9  
Gross operating margin 177.4 191.4 355.1 395.9  
Property, plant and equipment, net 8,500.0   8,500.0   8,620.0
Investments in unconsolidated affiliates 22.0   22.0   22.5
Intangible assets, net 1,070.8   1,070.8   1,087.7
Goodwill 296.3   296.3   296.3
Segment assets 9,889.1   9,889.1   10,026.5
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 906.6 1,018.5 1,669.5 2,367.6  
Revenues from related parties 0.0 0.0 0.0 0.0  
Intersegment and intrasegment revenues 307.7 322.9 550.4 608.5  
Total revenues 1,214.3 1,341.4 2,219.9 2,976.1  
Equity in income (loss) of unconsolidated affiliates (4.3) (3.7) (9.4) (7.1)  
Gross operating margin 175.5 181.3 330.3 355.9  
Property, plant and equipment, net 3,265.2   3,265.2   3,060.7
Investments in unconsolidated affiliates 74.5   74.5   73.9
Intangible assets, net 187.2   187.2   191.7
Goodwill 956.2   956.2   956.2
Segment assets 4,483.1   4,483.1   4,282.5
Reportable Business Segments [Member] | Offshore Pipelines & Services [Member]          
Information by business segment [Abstract]          
Revenues from third parties 0.0 34.5 0.0 69.1  
Revenues from related parties 0.0 0.3 0.0 0.9  
Intersegment and intrasegment revenues 0.0 0.1 0.0 0.5  
Total revenues 0.0 34.9 0.0 70.5  
Equity in income (loss) of unconsolidated affiliates 0.0 21.0 0.0 41.2  
Gross operating margin 0.0 44.3 0.0 90.4  
Property, plant and equipment, net 0.0   0.0   0.0
Investments in unconsolidated affiliates 0.0   0.0   0.0
Intangible assets, net 0.0   0.0   0.0
Goodwill 0.0   0.0   0.0
Segment assets 0.0   0.0   0.0
Eliminations [Member]          
Information by business segment [Abstract]          
Revenues from third parties 0.0 0.0 0.0 0.0  
Revenues from related parties 0.0 0.0 0.0 0.0  
Intersegment and intrasegment revenues (7,781.1) (4,813.2) (12,822.7) (8,989.4)  
Total revenues (7,781.1) (4,813.2) (12,822.7) (8,989.4)  
Equity in income (loss) of unconsolidated affiliates 0.0 0.0 0.0 0.0  
Gross operating margin 0.0 $ 0.0 0.0 $ 0.0  
Adjustments [Member]          
Information by business segment [Abstract]          
Property, plant and equipment, net 3,889.0   3,889.0   3,894.0
Investments in unconsolidated affiliates 0.0   0.0   0.0
Intangible assets, net 0.0   0.0   0.0
Goodwill 0.0   0.0   0.0
Segment assets $ 3,889.0   $ 3,889.0   $ 3,894.0