Net Income Per Limited Partner Unit - Schedule of Basic and Diluted Net Income Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Distribution Made To Limited Partner [Line Items]
Distributions declared			$ 645	$ 552
Distributions in excess of income			(138)	(24)
Net income attributable to the Partnership’s common unitholders (basic)			507	528
General Partner SPLC
Distribution Made To Limited Partner [Line Items]
Distributions declared			55	148
Distributions in excess of income			0	(1)
Net income attributable to the Partnership’s common unitholders (basic)			55	147
Limited Partners Common Units
Distribution Made To Limited Partner [Line Items]
Distributions declared			590	404
Distributions in excess of income			(138)	(23)
Net income attributable to the Partnership’s common unitholders (basic)		$ 508	452	$ 381
Dilutive effect of preferred units		48	36
Net income attributable to the Partnership’s common unitholders (diluted)		$ 556	$ 488
Weighted average units outstanding:
Weighted average units outstanding - Basic (in shares)		393.3	353.5	229.2
Dilutive effect of preferred units (in shares)	50.8		38.2
Weighted average units outstanding - Diluted (in shares)		444.1	391.7	229.2
Net income per limited partner unit:
Net income per limited partner unit - basic (in dollars per share)		$ 1.29	$ 1.28	$ 1.66
Net income per limited partner unit - diluted (in dollars per share)		$ 1.25	$ 1.25	$ 1.66