CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Partners’ Capital Excluding Noncontrolling Interests	Noncontrolling Interests	Series A Preferred Units Limited Partners Partners’ Capital Excluding Noncontrolling Interests	Series B Preferred Units Limited Partners Partners’ Capital Excluding Noncontrolling Interests	Common Units	Common Units Limited Partners Partners’ Capital Excluding Noncontrolling Interests
Balance, beginning of period at Dec. 31, 2016	$ 8,816	$ 8,759	$ 57	$ 1,508			$ 7,251
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	858	856	2		$ 11		845
Distributions (Note 12)	(1,399)	(1,397)	(2)		(11)		(1,386)
Sale of Series B preferred units	788	788			788
Sales of common units	1,664	1,664				$ 1,664	1,664
Acquisition of interest in Advantage Joint Venture (Note 7)	40	40					40
Sale of interest in SLC Pipeline LLC (Note 12)	(57)		(57)
Other comprehensive income/(loss)	239	239					239
Equity-indexed compensation expense	22	22					22
Other	(13)	(13)		(3)			(10)
Balance, end of period at Dec. 31, 2017	10,958	10,958		1,505	788		8,665
Increase (Decrease) in Partners' Capital [Roll Forward]
Impact of adoption of ASU 2017-05 | ASU 2017-05	113	113					113
Balance at January 1, 2018	11,071	11,071		1,505	788		8,778
Net income	2,216	2,216		149	49		2,018
Distributions (Note 12)	(1,069)	(1,069)		(149)	(49)		(871)
Other comprehensive income/(loss)	(260)	(260)					(260)
Equity-indexed compensation expense	56	56					56
Other	(12)	(12)			(1)		(11)
Balance, end of period at Dec. 31, 2018	12,002	12,002		1,505	787		9,710
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	2,180	2,171	9	149	49		1,973
Distributions (Note 12)	(1,208)	(1,202)	(6)	(149)	(49)		(1,004)
Other comprehensive income/(loss)	97	97					97
Equity-indexed compensation expense	17	17					17
Sale of noncontrolling interest in a subsidiary (Note 12)	128	(2)	130				(2)
Other	(21)	(21)					(21)
Balance, end of period at Dec. 31, 2019	$ 13,195	$ 13,062	$ 133	$ 1,505	$ 787		$ 10,770