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	$ 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)	1,118
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	31,167	20,798	(5)	10,408	(34)
Balance, Beginning of Period at Dec. 31, 2018	31,017	20,773	(5)	10,291	(42)
Net income (loss)	4,825
Balance, End of Period at Dec. 31, 2019	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)	(964)
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)