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Business Segments, Consolidated Revenues and Expenses (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
Consolidated Revenues [Abstract]                      
Total consolidated 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]
Operating costs and expenses:                      
Cost of sales [3]                 22,065.8 26,789.8 21,487.0
Other operating costs and expenses [4]                 3,020.7 2,898.7 2,500.1
Depreciation, amortization and accretion                 1,848.3 1,687.0 1,531.3
Asset impairment and related charges                 132.7 50.5 49.8
Net gains attributable to asset sales                 (5.7) (28.7) (10.7)
General and administrative costs                 211.7 208.3 181.1
Total costs and expenses                 27,273.5 31,605.6 25,738.6
NGL Pipelines and Services [Member]                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 13,470.7 [1] 15,648.9 [1] 12,468.0 [2]
Crude Oil Pipelines & Services [Member]                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 10,287.3 [1] 11,042.6 [1] 8,156.8 [2]
Natural Gas Pipelines & Services [Member]                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 3,169.4 [1] 3,454.4 [1] 3,145.6 [2]
Petrochemical and Refined Products Services [Member]                      
Consolidated Revenues [Abstract]                      
Total consolidated revenues                 $ 5,861.8 [1] $ 6,388.3 [1] $ 5,471.1 [2]
[1] Revenues are accounted for under ASC 606.
[2] Revenues are accounted for under ASC 605.
[3] Cost of sales is a component of “Operating costs and expenses,” as presented on our Statements of Consolidated Operations.  Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.
[4] Represents the cost of operating our plants, pipelines and other fixed assets excluding: depreciation, amortization and accretion charges; asset impairment and related charges; and net losses (or gains) attributable to asset sales and insurance recoveries.