Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Millions	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
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	1,200	9	451	460	740	1,201	5	456	461	740
Other comprehensive loss	5	0	5	5	0	5	0	5	5	0
Partnership distributions	(72)	(1)	(71)	(72)	0	(72)	(1)	(71)	(72)	0
Investment segment contributions	500	0	0	0	500	500	0	0	0	500
Distributions to non-controlling interests in subsidiaries	(493)	0	0	0	(493)	(493)	0	0	0	(493)
Proceeds from subsidiary equity offerings	140	0	9	9	131	140	0	9	9	131
Changes in subsidiary equity and other	138	3	134	137	1	138	1	136	137	1
Equity at Jun. 30, 2014	14,727	(205)	6,836	6,631	8,096	14,750	(274)	6,928	6,654	8,096
Equity at Dec. 31, 2014	12,390	(229)	5,672	5,443	6,947	12,413	(285)	5,751	5,466	6,947
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	963	7	366	373	590	964	4	370	374	590
Other comprehensive loss	(80)	(1)	(61)	(62)	(18)	(80)	(1)	(61)	(62)	(18)
Partnership distributions	(58)	(1)	(57)	(58)	0	(58)	(1)	(57)	(58)	0
Investment segment contributions	245	0	0	0	245	245	0	0	0	245
Distributions to non-controlling interests in subsidiaries	(115)	0	0	0	(115)	(115)	0	0	0	(115)
Proceeds from subsidiary equity offerings	31	0	0	0	31	31	0	0	0	31
Acquisitions	65	0	0	0	65	65	0	0	0	65
Changes in subsidiary equity and other	1	0	(9)	(9)	10	1	0	(9)	(9)	10
Equity at Jun. 30, 2015	$ 13,442	$ (224)	$ 5,911	$ 5,687	$ 7,755	$ 13,466	$ (283)	$ 5,994	$ 5,711	$ 7,755