CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS' CAPITAL - USD ($) $ in Millions	Total	Noncontrolling Interests	Limited Partners Class A Shares
Increase (Decrease) in Partners' Capital
Impact of adoption of ASU 2017-05 | ASU 2017-05	$ 113	$ 89	$ 24
Beginning balance, adjusted balance	12,471	10,752	1,719
Beginning balance at Dec. 31, 2017	12,358	10,663	1,695
Increase (Decrease) in Partners' Capital
Net income	1,046	892	154
Distributions (Note 9)	(802)	(660)	(142)
Deferred tax asset	11		11
Other comprehensive income/(loss)	(46)	(36)	(10)
Change in ownership interest in connection with Exchange Right exercises (Note 9)		(6)	6
Equity-indexed compensation expense	37	31	6
Other	(6)	(9)	3
Ending balance at Sep. 30, 2018	12,711	10,964	1,747
Beginning balance at Jun. 30, 2018	12,215	10,554	1,661
Increase (Decrease) in Partners' Capital
Net income	676	565	111
Distributions (Note 9)	(267)	(219)	(48)
Deferred tax asset	2		2
Other comprehensive income/(loss)	76	59	17
Change in ownership interest in connection with Exchange Right exercises (Note 9)		(3)	3
Equity-indexed compensation expense	14	12	2
Other	(5)	(4)	(1)
Ending balance at Sep. 30, 2018	12,711	10,964	1,747
Beginning balance at Dec. 31, 2018	13,319	11,473	1,846
Increase (Decrease) in Partners' Capital
Net income	1,771	1,488	283
Distributions (Note 9)	(894)	(729)	(165)
Deferred tax asset	92		92
Other comprehensive income/(loss)	10	8	2
Change in ownership interest in connection with Exchange Right exercises (Note 9)		(100)	100
Equity-indexed compensation expense	14	10	4
Sale of noncontrolling interest in a subsidiary (Note 9)	128	128
Other	(17)	(10)	(7)
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	431	361	70
Distributions (Note 9)	(315)	(255)	(60)
Deferred tax asset	65		65
Other comprehensive income/(loss)	(99)	(76)	(23)
Change in ownership interest in connection with Exchange Right exercises (Note 9)		(69)	69
Equity-indexed compensation expense	6	5	1
Other	(7)	(4)	(3)
Ending balance at Sep. 30, 2019	$ 14,423	$ 12,268	$ 2,155