Condensed Consolidated Statement of Changes in Equity (USD $) In Millions, unless otherwise specified	Total	General partner	Limited partners	Parent [Member]	Non-controlling Interests	Icahn Enterprises Holdings [Member]	Icahn Enterprises Holdings [Member] General partner	Icahn Enterprises Holdings [Member] Limited partners	Icahn Enterprises Holdings [Member] Parent [Member]	Icahn Enterprises Holdings [Member] Non-controlling Interests
Equity at Dec. 31, 2013	$ 13,309	$ (216)	$ 6,308	$ 6,092	$ 7,217	$ 13,331	$ (279)	$ 6,393	$ 6,114	$ 7,217
General partner	(1)					0
Limited partners	(28)					(29)
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	77	(1)	(28)	(29)	106	77	0	(29)	(29)	106
Other comprehensive loss	(3)	0	(2)	(2)	(1)	(3)	0	(2)	(2)	(1)
Partnership distributions	(199)	(4)	(195)	(199)	0	(199)	(2)	(197)	(199)	0
Distributions to non-controlling interests in subsidiaries	(427)	0	0	0	(427)	(427)	0	0	0	(427)
Changes in subsidiary equity and other	134	3	131	134	0	134	1	133	134	0
Equity at Mar. 31, 2014	12,891	(218)	6,214	5,996	6,895	12,913	(280)	6,298	6,018	6,895
Equity at Dec. 31, 2014	12,390	(229)	5,672	5,443	6,947	12,413	(285)	5,751	5,466	6,947
General partner	3	3				2
Limited partners	158		158			159
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income (loss)	422			161	261	422	2	159	161	261
Other comprehensive loss	(105)	(1)	(82)	(83)	(22)	(105)	(1)	(82)	(83)	(22)
Partnership distributions	(188)	(4)	(184)	(188)	0	(188)	(2)	(186)	(188)	0
Investment segment contributions	245	0	0	0	245	245	0	0	0	245
Distributions to non-controlling interests in subsidiaries	(48)	0	0	0	(48)	(48)	0	0	0	(48)
Proceeds from subsidiary equity offering	20	0	0	0	20	20	0	0	0	20
Changes in subsidiary equity and other	(1)	0	(11)	(11)	10	(1)	0	(11)	(11)	10
Equity at Mar. 31, 2015	$ 12,735	$ (231)	$ 5,553	$ 5,322	$ 7,413	$ 12,758	$ (286)	$ 5,631	$ 5,345	$ 7,413