CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Noncontrolling Interests	Limited Partners Class A Shares
Beginning balance at Dec. 31, 2018	$ 13,319	$ 11,473	$ 1,846
Increase (Decrease) in Partners' Capital
Net income/(loss)	1,771	1,488	283
Distributions (Note 9)	(894)	(729)	(165)
Deferred tax asset	92	0	92
Other comprehensive income/(loss)	10	8	2
Change in ownership interest in connection with Exchange Right exercises (Note 9)	0	(100)	100
Contributions from noncontrolling interests (Note 9)	0
Sale of noncontrolling interest in a subsidiary	128	128	0
Other	(3)	0	(3)
Ending balance at Sep. 30, 2019	14,423	12,268	2,155
Beginning balance at Jun. 30, 2019	14,342	12,306	2,036
Increase (Decrease) in Partners' Capital
Net income/(loss)	431	361	70
Distributions (Note 9)	(315)	(255)	(60)
Deferred tax asset	65	0	65
Other comprehensive income/(loss)	(99)	(76)	(23)
Change in ownership interest in connection with Exchange Right exercises (Note 9)	0	(69)	69
Other	(1)	1	(2)
Ending balance at Sep. 30, 2019	14,423	12,268	2,155
Beginning balance at Dec. 31, 2019	14,485	12,330	2,155
Increase (Decrease) in Partners' Capital
Net income/(loss)	(2,417)	(1,869)	(548)
Distributions (Note 9)	(679)	(547)	(132)
Deferred tax asset	13	0	13
Other comprehensive income/(loss)	(129)	(97)	(32)
Change in ownership interest in connection with Exchange Right exercises (Note 9)	0	(10)	10
Contributions from noncontrolling interests (Note 9)	11	11	0
Other	13	7	6
Ending balance at Sep. 30, 2020	11,297	9,825	1,472
Beginning balance at Jun. 30, 2020	11,253	9,788	1,465
Increase (Decrease) in Partners' Capital
Net income/(loss)	139	122	17
Distributions (Note 9)	(182)	(149)	(33)
Other comprehensive income/(loss)	82	61	21
Change in ownership interest in connection with Exchange Right exercises (Note 9)	0	(1)	1
Contributions from noncontrolling interests (Note 9)	1	1	0
Other	4	3	1
Ending balance at Sep. 30, 2020	$ 11,297	$ 9,825	$ 1,472