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Investments in Unconsolidated Entities - Equity Method Investments (Details) shares in Millions, $ in Millions		3 Months Ended			12 Months Ended
	Apr. 03, 2017 USD ($) shares	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2021 USD ($) bbl	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2019
Investments in Unconsolidated Entities
Investments in unconsolidated entities						$ 3,683.0	$ 2,702.0	$ 2,756.0
Carrying value of undivided joint interest						15,355.0	14,787.0
Advance cash payment, pipeline capacity agreements						354.0	338.0	90.0
Value of units contributed								40.0
Capital contributions to equity method investees excluding capitalized interest						504.0	459.0	398.0
Capitalized interest related to contributions to unconsolidated entities						34.0	30.0	$ 35.0
Amount by which investments in unconsolidated entities exceeded our share of the underlying equity in the net assets						$ 349.0	467.0
Advantage Pipeline Holdings LLC (“Advantage Joint Venture”)
Investments in Unconsolidated Entities
Ownership interest	50.00%					50.00%
Investments in unconsolidated entities	$ 66.5					$ 76.0	72.0
Payments to acquire equity method investments	26.0
BridgeTex Pipeline Company, LLC (“BridgeTex”)
Investments in Unconsolidated Entities
Ownership interest			20.00%			20.00%
Investments in unconsolidated entities						$ 431.0	435.0
Proceeds from sale of equity method investment			$ 868.0
Ownership percentage sold			30.00%
Gain on sale of investment in unconsolidated entities							200.0
Cactus II Pipeline LLC (“Cactus II”)
Investments in Unconsolidated Entities
Ownership interest						65.00%
Investments in unconsolidated entities						$ 738.0	455.0
Reduction of property and equipment from deconsolidation				$ 74.0
Proceeds from sale of equity method investment				$ 26.0
Caddo Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 65.0	65.0
Capline Pipeline Company LLC
Investments in Unconsolidated Entities
Ownership interest						54.00%
Investments in unconsolidated entities						$ 484.0
Fair value of investment in unconsolidated entity		$ 444.0
Capline Pipeline Company LLC \| Gain on investment in unconsolidated entities
Investments in Unconsolidated Entities
Gain from remeasurement to fair value of retained investment						$ 269.0
Cheyenne Pipeline LLC (“Cheyenne”)
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 44.0	44.0
Cushing Connect Pipeline & Terminal LLC
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 23.0
Diamond Pipeline LLC (“Diamond”)
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 476.0	479.0
Eagle Ford Pipeline LLC (“Eagle Ford Pipeline”)
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 382.0	383.0
Eagle Ford Terminals Corpus Christi LLC (“Eagle Ford Terminals”)
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 126.0	108.0
Midway Pipeline LLC
Investments in Unconsolidated Entities
Ownership interest						50.00%		50.00%
Investments in unconsolidated entities						$ 76.0	78.0
Red Oak Pipeline LLC (“Red Oak”)
Investments in Unconsolidated Entities
Ownership interest						50.00%			50.00%
Investments in unconsolidated entities						$ 20.0
Red Oak Pipeline LLC (“Red Oak”) \| Forecast
Investments in Unconsolidated Entities
Future increase in investment from contribution					$ 155.0
Red Oak Pipeline LLC (“Red Oak”) \| Sunrise II pipeline \| Forecast
Investments in Unconsolidated Entities
Pipeline capacity to be contributed (in bbls) \| bbl					260,000
Capacity lease agreement, term of contract					33 years
Saddlehorn Pipeline Company, LLC (“Saddlehorn”)
Investments in Unconsolidated Entities
Ownership interest						40.00%
Investments in unconsolidated entities						$ 234.0	215.0
Settoon Towing, LLC
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 59.0	58.0
STACK Pipeline LLC (“STACK”)
Investments in Unconsolidated Entities
Ownership interest						50.00%
Investments in unconsolidated entities						$ 117.0	120.0
White Cliffs Pipeline, LLC
Investments in Unconsolidated Entities
Ownership interest						36.00%
Investments in unconsolidated entities						$ 196.0	190.0
Wink to Webster Pipeline LLC (“W2W Pipeline”)
Investments in Unconsolidated Entities
Ownership interest						16.00%
Investments in unconsolidated entities						$ 136.0
Equity Method Investees
Investments in Unconsolidated Entities
Capitalized interest related to contributions to unconsolidated entities						$ 20.0	$ 9.0	$ 18.0
Capline Pipeline Company LLC \| Capline pipeline system
Investments in Unconsolidated Entities
Percentage of Capline pipeline system owned		100.00%
Advantage Joint Venture \| Advantage Pipeline Holdings LLC (“Advantage Joint Venture”)
Investments in Unconsolidated Entities
Purchase price	$ 133.0
Oxy \| Cactus II Pipeline LLC (“Cactus II”)
Investments in Unconsolidated Entities
Interest acquired				20.00%
Third Party \| Cactus II Pipeline LLC (“Cactus II”)
Investments in Unconsolidated Entities
Interest acquired				15.00%
Common Units \| Advantage Pipeline Holdings LLC (“Advantage Joint Venture”)
Investments in Unconsolidated Entities
Units contributed \| shares	1.3
Value of units contributed	$ 40.0
Other long-term liabilities and deferred credits \| Cactus II Pipeline LLC (“Cactus II”)
Investments in Unconsolidated Entities
Advance cash payment, pipeline capacity agreements				$ 100.0
Undivided joint interest in Capline pipeline system
Investments in Unconsolidated Entities
Undivided joint interest ownership percentage		54.00%
Carrying value of undivided joint interest		$ 175.0
Undivided joint interest in pipeline segment \| Wink to Webster Pipeline LLC (“W2W Pipeline”) \| Midland, Texas to Webster, Texas pipeline segment
Investments in Unconsolidated Entities
Undivided joint interest ownership percentage						71.00%
Undivided joint interest in pipeline segment \| Enterprise Products Partners, L.P. \| Midland, Texas to Webster, Texas pipeline segment
Investments in Unconsolidated Entities
Undivided joint interest ownership percentage						29.00%