Business Segments, Segment Reporting Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Information by business segment [Abstract]
Gross operating margin	$ 8,508.5	$ 8,188.1	$ 8,289.8
Revenues from third parties	40,726.8	27,163.0	32,721.9
Revenues from related parties	80.1	36.7	67.3
Intersegment and intrasegment revenues	0.0	0.0	0.0
Total revenues	40,806.9	27,199.7	32,789.2
Equity in income (loss) of unconsolidated affiliates	583.4	426.1	563.0
Property, plant and equipment, net	42,087.7	41,912.8	41,603.4
Investments in unconsolidated affiliates	2,428.4	2,429.2	2,600.2
Intangible assets, net	3,150.6	3,309.1	3,449.0
Goodwill	5,448.9	5,448.9	5,745.2
Segment assets	53,115.6	53,100.0	53,397.8
NGL Pipelines and Services [Member]
Information by business segment [Abstract]
Total revenues	16,302.6	11,177.2	13,470.7
Equity in income (loss) of unconsolidated affiliates	120.0	121.3	114.5
Intangible assets, net	317.2	334.1
Goodwill	2,651.7	2,651.7	2,651.7
Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	10,902.2	6,689.0	10,287.3
Equity in income (loss) of unconsolidated affiliates	456.3	301.2	449.2
Intangible assets, net	1,860.0	1,936.6
Goodwill	1,841.0	1,841.0	1,841.0
Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Total revenues	4,399.6	2,553.1	3,169.4
Equity in income (loss) of unconsolidated affiliates	5.8	5.8	6.3
Intangible assets, net	848.7	905.0
Goodwill	0.0	0.0	296.3
Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Total revenues	9,202.5	6,780.4	5,861.8
Equity in income (loss) of unconsolidated affiliates	1.3	(2.2)	(7.0)
Intangible assets, net	124.7	133.4
Goodwill	956.2	956.2	956.2
Reportable Business Segments [Member] | NGL Pipelines and Services [Member]
Information by business segment [Abstract]
Gross operating margin	4,315.9	4,182.4	4,069.8
Revenues from third parties	16,293.3	11,170.6	13,460.8
Revenues from related parties	9.3	6.6	9.9
Intersegment and intrasegment revenues	55,796.3	29,010.3	20,840.4
Total revenues	72,098.9	40,187.5	34,311.1
Equity in income (loss) of unconsolidated affiliates	120.0	121.3	114.5
Property, plant and equipment, net	17,202.1	17,128.3	16,652.1
Investments in unconsolidated affiliates	656.8	671.6	703.8
Intangible assets, net	317.2	334.1	360.2
Goodwill	2,651.7	2,651.7	2,651.7
Segment assets	20,827.8	20,785.7	20,367.8
Reportable Business Segments [Member] | Crude Oil Pipelines & Services [Member]
Information by business segment [Abstract]
Gross operating margin	1,679.9	1,997.3	2,087.8
Revenues from third parties	10,849.3	6,668.8	10,244.6
Revenues from related parties	52.9	20.2	42.7
Intersegment and intrasegment revenues	29,984.4	24,531.3	34,613.0
Total revenues	40,886.6	31,220.3	44,900.3
Equity in income (loss) of unconsolidated affiliates	456.3	301.2	449.2
Property, plant and equipment, net	6,973.5	6,982.6	6,324.4
Investments in unconsolidated affiliates	1,736.8	1,723.7	1,866.5
Intangible assets, net	1,860.0	1,936.6	2,001.9
Goodwill	1,841.0	1,841.0	1,841.0
Segment assets	12,411.3	12,483.9	12,033.8
Reportable Business Segments [Member] | Natural Gas Pipelines & Services [Member]
Information by business segment [Abstract]
Gross operating margin	1,155.5	926.6	1,062.6
Revenues from third parties	4,381.7	2,543.2	3,154.7
Revenues from related parties	17.9	9.9	14.7
Intersegment and intrasegment revenues	650.0	460.1	624.7
Total revenues	5,049.6	3,013.2	3,794.1
Equity in income (loss) of unconsolidated affiliates	5.8	5.8	6.3
Property, plant and equipment, net	8,560.3	8,465.8	8,432.5
Investments in unconsolidated affiliates	31.6	31.4	27.3
Intangible assets, net	848.7	905.0	941.2
Goodwill	0.0	0.0	296.3
Segment assets	9,440.6	9,402.2	9,697.3
Reportable Business Segments [Member] | Petrochemical & Refined Products Services [Member]
Information by business segment [Abstract]
Gross operating margin	1,357.2	1,081.8	1,069.6
Revenues from third parties	9,202.5	6,780.4	5,861.8
Revenues from related parties	0.0	0.0	0.0
Intersegment and intrasegment revenues	22,110.4	5,379.4	2,481.3
Total revenues	31,312.9	12,159.8	8,343.1
Equity in income (loss) of unconsolidated affiliates	1.3	(2.2)	(7.0)
Property, plant and equipment, net	7,735.4	7,528.4	7,553.2
Investments in unconsolidated affiliates	3.2	2.5	2.6
Intangible assets, net	124.7	133.4	145.7
Goodwill	956.2	956.2	956.2
Segment assets	8,819.5	8,620.5	8,657.7
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	(108,541.1)	(59,381.1)	(58,559.4)
Total revenues	(108,541.1)	(59,381.1)	(58,559.4)
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	1,616.4	1,807.7	2,641.2
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	$ 1,616.4	$ 1,807.7	$ 2,641.2