UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN (DEFICIT) EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Financing Receivable	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Preferred Partner Shell Pipeline Company L P	Common Unitholders	Common Unitholders Cumulative Effect, Period of Adoption, Adjustment	Common Unitholders Shell Pipeline Company L P	Common Unitholders Shell Pipeline Company L P Cumulative Effect, Period of Adoption, Adjustment	General Partner Shell Pipeline Company L P	General Partner Shell Pipeline Company L P Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2018	$ (257)	$ (9)		$ 0	$ 25		$ 3,459	$ (4)	$ (198)	$ (5)	$ (3,543)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	137				5		58		47		27
Other contributions from Parent	7										7
Distributions to unitholders and general partner	(129)						(49)		(40)		(40)
Distributions to noncontrolling interests	(3)				(3)
Ending balance at Mar. 31, 2019	(254)			0	27		3,464		(196)		(3,549)
Beginning balance at Dec. 31, 2018	(257)	$ (9)		0	25		3,459	$ (4)	(198)	$ (5)	(3,543)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	256
Ending balance at Jun. 30, 2019	(767)			(6)	25		3,458		(198)		(4,046)
Beginning balance at Mar. 31, 2019	(254)			0	27		3,464		(196)		(3,549)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	119				4		45		40		30
Other contributions from Parent	3			(6)							9
Distributions to unitholders and general partner	(119)						(51)		(42)		(26)
Distributions to noncontrolling interests	(6)				(6)
April 2020 Transaction and June 2019 Acquisition	(510)										(510)
Ending balance at Jun. 30, 2019	(767)			(6)	25		3,458		(198)		(4,046)
Beginning balance at Dec. 31, 2019	(749)		$ 0	(8)	26	$ 0	3,450		(203)		(4,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	142				4		44		39		55
Distributions to unitholders and general partner	(162)						(57)		(50)		(55)
Distributions to noncontrolling interests	(5)				(5)
Ending balance at Mar. 31, 2020	(774)		0	(8)	25	0	3,437		(214)		(4,014)
Beginning balance at Dec. 31, 2019	(749)		0	(8)	26	0	3,450		(203)		(4,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	286
Ending balance at Jun. 30, 2020	(379)		(301)	(8)	24	(1,059)	3,421		(2,456)		0
Beginning balance at Mar. 31, 2020	(774)		0	(8)	25	0	3,437		(214)		(4,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	144				3	12	41		88		0
Other contributions from Parent	1			0					1		0
Distributions to unitholders and general partner	(163)						(57)		(51)		(55)
Distributions to noncontrolling interests	(4)				(4)
Principal repayments on financing receivables	1		1
April 2020 Transaction and June 2019 Acquisition	416		(302)			(1,071)			(2,280)		4,069
Ending balance at Jun. 30, 2020	$ (379)		$ (301)	$ (8)	$ 24	$ (1,059)	$ 3,421		$ (2,456)		$ 0