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Business Segments, Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Information by business segment [Abstract]                      
Gross operating margin                 $ 8,289.8 $ 7,291.0 $ 5,674.6
Revenues from third parties                 32,721.9 36,426.5 29,196.5
Revenues from related parties                 67.3 107.7 45.0
Intersegment and intrasegment revenues                 0.0 0.0 0.0
Total revenues $ 8,005.3 $ 7,964.1 $ 8,276.3 $ 8,543.5 $ 9,182.3 $ 9,585.9 $ 8,467.5 $ 9,298.5 32,789.2 [1] 36,534.2 [1] 29,241.5 [2]
Equity in income (loss) of unconsolidated affiliates                 563.0 480.0 426.0
Property, plant and equipment, net 41,603.4       38,737.6       41,603.4 38,737.6 35,620.4
Investments in unconsolidated affiliates 2,600.2       2,615.1       2,600.2 2,615.1 2,659.4
Intangible assets, net 3,449.0       3,608.4       3,449.0 3,608.4 3,690.3
Goodwill 5,745.2       5,745.2       5,745.2 5,745.2 5,745.2
Segment assets 53,397.8       50,706.3       53,397.8 50,706.3 47,715.3
NGL Pipelines and Services [Member]                      
Information by business segment [Abstract]                      
Total revenues                 13,470.7 [1] 15,648.9 [1] 12,468.0 [2]
Equity in income (loss) of unconsolidated affiliates                 114.5 117.0 73.4
Intangible assets, net 360.2       380.1       360.2 380.1  
Crude Oil Pipelines & Services [Member]                      
Information by business segment [Abstract]                      
Total revenues                 10,287.3 [1] 11,042.6 [1] 8,156.8 [2]
Equity in income (loss) of unconsolidated affiliates                 449.2 365.4 358.4
Intangible assets, net 2,001.9       2,094.6       2,001.9 2,094.6  
Natural Gas Pipelines & Services [Member]                      
Information by business segment [Abstract]                      
Total revenues                 3,169.4 [1] 3,454.4 [1] 3,145.6 [2]
Equity in income (loss) of unconsolidated affiliates                 6.3 6.8 3.8
Intangible assets, net 941.2       979.3       941.2 979.3  
Petrochemical & Refined Products Services [Member]                      
Information by business segment [Abstract]                      
Total revenues                 5,861.8 [1] 6,388.3 [1] 5,471.1 [2]
Equity in income (loss) of unconsolidated affiliates [3]                 (7.0) (9.2) (9.6)
Intangible assets, net 145.7       154.4       145.7 154.4  
Reportable Business Segments [Member] | NGL Pipelines and Services [Member]                      
Information by business segment [Abstract]                      
Gross operating margin                 4,069.8 3,830.7 3,258.3
Revenues from third parties                 13,460.8 15,630.5 12,455.7
Revenues from related parties                 9.9 18.4 12.3
Intersegment and intrasegment revenues                 20,840.4 26,453.6 27,278.6
Total revenues                 34,311.1 42,102.5 39,746.6
Equity in income (loss) of unconsolidated affiliates                 114.5 117.0 73.4
Property, plant and equipment, net 16,652.1       14,845.4       16,652.1 14,845.4 13,831.2
Investments in unconsolidated affiliates 703.8       662.0       703.8 662.0 733.9
Intangible assets, net 360.2       380.1       360.2 380.1 322.3
Goodwill 2,651.7       2,651.7       2,651.7 2,651.7 2,651.7
Segment assets 20,367.8       18,539.2       20,367.8 18,539.2 17,539.1
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]                      
Information by business segment [Abstract]                      
Gross operating margin                 2,087.8 1,511.3 987.2
Revenues from third parties                 10,244.6 10,968.2 8,137.2
Revenues from related parties                 42.7 74.4 19.6
Intersegment and intrasegment revenues                 34,613.0 35,490.4 15,943.0
Total revenues                 44,900.3 46,533.0 24,099.8
Equity in income (loss) of unconsolidated affiliates                 449.2 365.4 358.4
Property, plant and equipment, net 6,324.4       5,847.7       6,324.4 5,847.7 5,208.4
Investments in unconsolidated affiliates 1,866.5       1,867.5       1,866.5 1,867.5 1,839.2
Intangible assets, net 2,001.9       2,094.6       2,001.9 2,094.6 2,186.5
Goodwill 1,841.0       1,841.0       1,841.0 1,841.0 1,841.0
Segment assets 12,033.8       11,650.8       12,033.8 11,650.8 11,075.1
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]                      
Information by business segment [Abstract]                      
Gross operating margin                 1,062.6 891.2 714.5
Revenues from third parties                 3,154.7 3,439.5 3,132.5
Revenues from related parties                 14.7 14.9 13.1
Intersegment and intrasegment revenues                 624.7 721.9 850.8
Total revenues                 3,794.1 4,176.3 3,996.4
Equity in income (loss) of unconsolidated affiliates                 6.3 6.8 3.8
Property, plant and equipment, net 8,432.5       8,303.8       8,432.5 8,303.8 8,375.0
Investments in unconsolidated affiliates 27.3       22.8       27.3 22.8 20.8
Intangible assets, net 941.2       979.3       941.2 979.3 1,018.4
Goodwill 296.3       296.3       296.3 296.3 296.3
Segment assets 9,697.3       9,602.2       9,697.3 9,602.2 9,710.5
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]                      
Information by business segment [Abstract]                      
Gross operating margin                 1,069.6 1,057.8 714.6
Revenues from third parties                 5,861.8 6,388.3 5,471.1
Revenues from related parties                 0.0 0.0 0.0
Intersegment and intrasegment revenues                 2,481.3 2,917.5 1,766.9
Total revenues                 8,343.1 9,305.8 7,238.0
Equity in income (loss) of unconsolidated affiliates                 (7.0) (9.2) (9.6)
Property, plant and equipment, net 7,553.2       6,213.9       7,553.2 6,213.9 3,507.7
Investments in unconsolidated affiliates 2.6       62.8       2.6 62.8 65.5
Intangible assets, net 145.7       154.4       145.7 154.4 163.1
Goodwill 956.2       956.2       956.2 956.2 956.2
Segment assets 8,657.7       7,387.3       8,657.7 7,387.3 4,692.5
Eliminations [Member]                      
Information by business segment [Abstract]                      
Revenues from third parties                 0.0 0.0 0.0
Revenues from related parties                 0.0 0.0 0.0
Intersegment and intrasegment revenues                 (58,559.4) (65,583.4) (45,839.3)
Total revenues                 (58,559.4) (65,583.4) (45,839.3)
Equity in income (loss) of unconsolidated affiliates                 0.0 0.0 0.0
Adjustments [Member]                      
Information by business segment [Abstract]                      
Property, plant and equipment, net 2,641.2       3,526.8       2,641.2 3,526.8 4,698.1
Investments in unconsolidated affiliates 0.0       0.0       0.0 0.0 0.0
Intangible assets, net 0.0       0.0       0.0 0.0 0.0
Goodwill 0.0       0.0       0.0 0.0 0.0
Segment assets $ 2,641.2       $ 3,526.8       $ 2,641.2 $ 3,526.8 $ 4,698.1
[1] Revenues are accounted for under ASC 606.
[2] Revenues are accounted for under ASC 605.
[3]
The losses recorded for this segment are primarily due to protection, maintenance and pipeline integrity costs of the idled Centennial Pipeline, which was purged and filled with nitrogen in 2013.  Although we wrote off our investment in Centennial in 2019, we, as a 50% owner of Centennial, have a continuing obligation to fund the pipeline’s costs in its idled state.