UNAUDITED CONSOLIDATED STATEMENT OF CHANGES IN (DEFICIT) EQUITY - USD ($) $ in Millions	Total	Financing Receivables	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Preferred Partner Shell Pipeline Company L P	Common Unitholders	Common Unitholders Shell Pipeline Company L P	General Partner SPLC Shell Pipeline Company L P
Beginning balance at Dec. 31, 2019	$ (749)		$ (8)	$ 26		$ 3,450	$ (203)	$ (4,014)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	142			4		44	39	55
Distributions to unitholders	(162)					(57)	(50)	(55)
Distributions to noncontrolling interests	(5)			(5)
Ending balance at Mar. 31, 2020	(774)		(8)	25		3,437	(214)	$ (4,014)
Beginning balance at Dec. 31, 2020	(458)	$ (298)	(9)	23	$ (1,059)	3,382	(2,497)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	167			4	12	48	103
Distributions to unitholders	(173)				(12)	(57)	(104)
Distributions to noncontrolling interests	(4)			(4)
Principal repayments on financing receivables	1	1
Ending balance at Mar. 31, 2021	$ (467)	$ (297)	$ (9)	$ 23	$ (1,059)	$ 3,373	$ (2,498)