Consolidated Statement Of Equity - USD ($) $ in Millions		Total		Limited Partner [Member]	General Partner	Noncontrolling Interest	AOCI Attributable to Parent [Member]
Balance, Beginning of Period at Dec. 31, 2018	[1]	$ 31,017		$ 20,773	$ (5)	$ 10,291	$ (42)
Distributions to partners		(800)		(799)	(1)	0	0
Distributions to noncontrolling interests		(425)		0	0	(425)	0
Capital contributions from noncontrolling interests		140		0	0	140	0
Sale of noncontrolling interest in subsidiary		93		0	0	93	0
Other comprehensive loss, net of tax		8		0	0	0	8
Other, net		29		17	0	12	0
Net income (loss)		3,420
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		1,105		807	1	297	0
Balance, End of Period at Mar. 31, 2019	[1]	31,167		20,798	(5)	10,408	(34)
Balance, Beginning of Period at Dec. 31, 2018	[1]	31,017		20,773	(5)	10,291	(42)
Other comprehensive loss, net of tax	[1]	2
Net income (loss)	[1]	3,514
Balance, End of Period at Sep. 30, 2019		32,174		21,094	(4)	11,124	(40)
Balance, Beginning of Period at Mar. 31, 2019	[1]	31,167		20,798	(5)	10,408	(34)
Distributions to partners		(749)		(748)	(1)	0	0
Distributions to noncontrolling interests		(388)		0	0	(388)	0
Subsidiary units issued		780		0	0	780	0
Capital contributions from noncontrolling interests		66		0	0	66	0
Other comprehensive loss, net of tax		1		0	0	0	1
Other, net		50		50	0	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		1,196		878	1	317	0
Balance, End of Period at Jun. 30, 2019	[1]	32,123		20,978	(5)	11,183	(33)
Distributions to partners		(800)		(800)	0	0	0
Distributions to noncontrolling interests		(457)		0	0	(457)	0
Capital contributions from noncontrolling interests		72		0	0	72	0
Other comprehensive loss, net of tax		(7)	[1]	0	0	0	(7)
Other, net		19		10	0	9	0
Net income (loss)	[1]	1,187
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		1,175		857	1	317	0
Balance, End of Period at Sep. 30, 2019		32,174		21,094	(4)	11,124	(40)
Partners' Capital Account, Sale of Units		49		49	0	0	0
Balance, Beginning of Period at Dec. 31, 2019	[1]	33,938		21,935	(4)	12,018	(11)
Distributions to partners		(1,592)		(1,591)	(1)	0	0
Distributions to noncontrolling interests		(444)		0	0	(444)	0
Subsidiary units issued		1,580		0	0	1,580	0
Capital contributions from noncontrolling interests		95		0	0	95	0
Other comprehensive loss, net of tax		(86)		0	0	(38)	(48)
Other, net		15		22	0	(7)	0
Net income (loss)		4,825
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		(976)		(854)	(1)	(121)	0
Balance, End of Period at Mar. 31, 2020		32,530		19,512	(6)	13,083	(59)
Balance, Beginning of Period at Dec. 31, 2019	[1]	33,938		21,935	(4)	12,018	(11)
Other comprehensive loss, net of tax		(13)
Net income (loss)		(693)
Balance, End of Period at Sep. 30, 2020		31,291		18,296	(8)	13,007	(4)
Balance, Beginning of Period at Mar. 31, 2020		32,530		19,512	(6)	13,083	(59)
Distributions to partners		8		9	(1)	0	0
Distributions to noncontrolling interests		(408)		0	0	(408)	0
Capital contributions from noncontrolling interests		83		0	0	83	0
Other comprehensive loss, net of tax		47		0	0	9	38
Other, net		(27)		(31)	0	4	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		659		353	0	306	0
Balance, End of Period at Jun. 30, 2020		32,892		19,843	(7)	13,077	(21)
Partners' Capital Account, Sale of Units		0		0	0	0	0
Distributions to partners		(813)		(812)	(1)	0	0
Distributions to noncontrolling interests		(430)		0	0	(430)	0
Capital contributions from noncontrolling interests		25		0	0	25	0
Other comprehensive loss, net of tax		26		0	0	9	17
Other, net		4		47	0	(43)	0
Net income (loss)		(401)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Excluding Portion Attributable to Redeemable Noncontrolling Interest		(413)		(782)	0	369	0
Balance, End of Period at Sep. 30, 2020		$ 31,291		$ 18,296	$ (8)	$ 13,007	$ (4)

[1] *As adjusted. See Note 1.