Description of the Business and Basis of Presentation (Details)	12 Months Ended
	Dec. 31, 2020 segment shares	Apr. 01, 2020 shares	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Common units (in units)		393,289,537
Number of segments | segment	1
Limited Partner | Partnership Interests Restructuring Agreement | Series A Perpetual Convertible Preferred Units
Schedule of Equity Method Investments [Line Items]
Unit distribution (in units)	50,782,904
Economic Interest | General Partner SPLC
Schedule of Equity Method Investments [Line Items]
Noncontrolling interest	2.00%
Shell Pipeline Company L P | Limited Partner
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percentage)	68.50%
Common units (in units)	269,457,304
Shell Pipeline Company L P | Limited Partner | Common Units And Series A Perpetual Convertible Preferred Units
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percentage)	72.00%
Pecten Midstream LLC (“Pecten”)
Schedule of Equity Method Investments [Line Items]
Ownership	100.00%
Sand Dollar Pipeline LLC (“Sand Dollar”)
Schedule of Equity Method Investments [Line Items]
Ownership	100.00%
Triton West LLC (“Triton”)
Schedule of Equity Method Investments [Line Items]
Ownership	100.00%
Zydeco Pipeline Company LLC (“Zydeco”)
Schedule of Equity Method Investments [Line Items]
Ownership	92.50%
Zydeco Pipeline Company LLC (“Zydeco”) | Zydeco Pipeline Company LLC (“Zydeco”)
Schedule of Equity Method Investments [Line Items]
Shell's Retained Ownership	7.50%
Mattox Pipeline Company LLC (“Mattox”)
Schedule of Equity Method Investments [Line Items]
Ownership	79.00%
Amberjack Pipeline Company LLC - Series A
Schedule of Equity Method Investments [Line Items]
Ownership	75.00%		75.00%
Amberjack Pipeline Company LLC - Series B
Schedule of Equity Method Investments [Line Items]
Ownership	50.00%		50.00%
Mars Oil Pipeline Company LLC (“Mars”)
Schedule of Equity Method Investments [Line Items]
Ownership	71.50%		71.50%
Odyssey Pipeline L.L.C. (“Odyssey”)
Schedule of Equity Method Investments [Line Items]
Ownership	71.00%
Bengal Pipeline Company LLC (“Bengal”)
Schedule of Equity Method Investments [Line Items]
Ownership	50.00%		50.00%
Crestwood Permian Basin LLC (“Permian Basin”)
Schedule of Equity Method Investments [Line Items]
Ownership	50.00%
LOCAP LLC (“LOCAP”)
Schedule of Equity Method Investments [Line Items]
Ownership	41.48%		41.48%
Explorer Pipeline Company (“Explorer”)
Schedule of Equity Method Investments [Line Items]
Ownership	38.59%		38.59%
Poseidon Oil Pipeline Company, L.L.C. (“Poseidon”)
Schedule of Equity Method Investments [Line Items]
Ownership	36.00%		36.00%
Colonial Enterprises, Inc. (“Colonial”)
Schedule of Equity Method Investments [Line Items]
Ownership	16.125%		16.125%
Proteus Oil Pipeline Company, LLC (“Proteus”)
Schedule of Equity Method Investments [Line Items]
Ownership	10.00%		10.00%
Endymion Oil Pipeline Company, LLC (“Endymion”)
Schedule of Equity Method Investments [Line Items]
Ownership	10.00%		10.00%
Cleopatra Gas Gathering Company, LLC (“Cleopatra”)
Schedule of Equity Method Investments [Line Items]
Ownership	1.00%