Consolidated Statement Of Equity - USD ($) $ in Millions		Total		AOCI	Noncontrolling Interests	Predecessor Equity [Member]	Preferred Units [Member]	Common unitholders [Member]
Balance, Beginning at Dec. 31, 2018	[1]	$ 36,788		$ (42)	$ 7,903		$ 2,388	$ 26,539
Distributions to partners		(1,514)		0	0		(64)	(1,450)
Distributions to noncontrolling interests		(361)		0	(361)		0	0
Capital contributions from noncontrolling interests		140		0	140		0	0
Sale of noncontrolling interest in subsidiary		93		0	93		0	0
Other comprehensive loss, net of tax		8		8	0		0	0
Other, net		28		0	13		0	15
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		1,206		0	256		40	910
Balance, Ending at Mar. 31, 2019	[1]	36,388		(34)	8,044		2,364	26,014
Balance, Beginning at Dec. 31, 2018	[1]	36,788		(42)	7,903		2,388	26,539
Equity in earnings (losses) of unconsolidated affiliates	[1]	224
Capital contributions from noncontrolling interests	[1]	278
Other comprehensive loss, net of tax	[1]	2
Balance, Ending at Sep. 30, 2019		35,743		(40)	7,974		3,151	24,658
Balance, Beginning at Mar. 31, 2019	[1]	36,388		(34)	8,044		2,364	26,014
Distributions to partners		(1,643)		0	0		(18)	(1,625)
Distributions to noncontrolling interests		(370)		0	(370)		0	0
Units issued for cash		(780)		0	0		(780)	0
Capital contributions from noncontrolling interests		66		0	66		0	0
Other comprehensive loss, net of tax		1		1	0		0	0
Other, net		(37)		0	0		(1)	(36)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		1,269		0	266		53	950
Balance, Ending at Jun. 30, 2019	[1]	36,454		(33)	8,006		3,178	25,303
Distributions to partners		(1,644)		0	0		(82)	(1,562)
Equity in earnings (losses) of unconsolidated affiliates	[1]	82
Distributions to noncontrolling interests		(374)		0	(374)		0	0
Capital contributions from noncontrolling interests		72		0	72		0	0
Other comprehensive loss, net of tax		(7)	[1]	(7)	0		0	0
Other, net		4		0	9		0	(5)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		1,238		0	261		55	922
Balance, Ending at Sep. 30, 2019		35,743		(40)	7,974		3,151	24,658
Balance, Beginning at Dec. 31, 2019	[1]	37,425		(18)	8,018	$ 2,025	3,174	24,226
Distributions to partners		(2,630)		0	0	0	(80)	(2,550)
Distributions to noncontrolling interests		(365)		0	(340)	(25)	0	0
Units issued for cash		(1,580)		0	0	0	(1,580)	0
Capital contributions from noncontrolling interests		96		0	66	30	0	0
Proceeds from Contributions from Parent		0		(2)	333	(2,171)	0	1,840
Other comprehensive loss, net of tax		(57)		(19)	0	(38)	0	0
Other, net		(18)		0	3	(10)	(3)	(8)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		(926)		0	(200)	(6)	77	(797)
Balance, Ending at Mar. 31, 2020	[1]	35,105		(39)	7,880	(195)	4,748	22,711
Balance, Beginning at Dec. 31, 2019	[1]	37,425		(18)	8,018	2,025	3,174	24,226
Equity in earnings (losses) of unconsolidated affiliates		46
Capital contributions from noncontrolling interests		173
Other comprehensive loss, net of tax		54
Balance, Ending at Sep. 30, 2020		33,717		(4)	8,239	0	4,768	20,714
Balance, Beginning at Mar. 31, 2020	[1]	35,105		(39)	7,880	(195)	4,748	22,711
Distributions to partners		(67)		0	0	0	(67)	0
Distributions to noncontrolling interests		(340)		0	(340)	0	0	0
Capital contributions from noncontrolling interests		82		0	82	0	0	0
Other comprehensive loss, net of tax		47		38	9	0	0	0
Other, net		33		0	2	0	(1)	32
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		706		0	225	0	84	397
Balance, Ending at Jun. 30, 2020		35,566		(21)	8,313	0	4,764	22,510
Partners' Capital Account, Contributions		0		(20)	455	195	0	(630)
Distributions to partners		(1,180)		0	0	0	(80)	(1,100)
Equity in earnings (losses) of unconsolidated affiliates		(32)
Distributions to noncontrolling interests		(350)		0	(350)	0	0	0
Capital contributions from noncontrolling interests		25		0	25	0	0	0
Other comprehensive loss, net of tax		26		17	9	0	0	0
Other, net		3		0	(42)	0	0	45
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		(373)		0	284	0	84	(741)
Balance, Ending at Sep. 30, 2020		$ 33,717		$ (4)	$ 8,239	$ 0	$ 4,768	$ 20,714

[1] *As adjusted. See Note 1.