Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Icahn Enterprises Holdings	General partner	General partner Icahn Enterprises Holdings	Limited partners	Limited partners Icahn Enterprises Holdings	Total Partners' Equity	Total Partners' Equity Icahn Enterprises Holdings	Non-controlling Interests	Non-controlling Interests Icahn Enterprises Holdings
Equity at Dec. 31, 2016	$ 8,017	$ 8,042	$ (294)	$ (317)	$ 2,448	$ 2,496	$ 2,154	$ 2,179	$ 5,863	$ 5,863
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	(160)	(160)	0	0	(18)	(18)	(18)	(18)	(142)	(142)
Other comprehensive income	100	100	2	1	92	93	94	94	6	6
Partnership distributions	(239)	(239)	(5)	(3)	(234)	(236)	(239)	(239)	0	0
Partnership contributions	612	612	12	6	600	606	612	612	0	0
Investment segment contributions	600	600	0	0	0	0	0	0	600	600
Dividends and distributions to non-controlling interests in subsidiaries	(10)	(10)	0	0	0	0	0	0	(10)	(10)
Cumulative effect adjustment from adoption of accounting principle	(47)	(47)	(1)	0	(46)	(47)	(47)	(47)	0	0
Changes in subsidiary equity and other	(306)	(306)	(3)	(2)	(123)	(124)	(126)	(126)	(180)	(180)
Equity at Mar. 31, 2017	8,567	8,592	(289)	(315)	2,719	2,770	2,430	2,455	6,137	6,137
Equity at Dec. 31, 2017	11,368	11,395	(235)	(287)	5,341	5,420	5,106	5,133	6,262	6,262
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	423	423	3	1	134	136	137	137	286	286
Other comprehensive income	43	43	1	1	39	39	40	40	3	3
Partnership distributions	(310)	(310)	(6)	(3)	(304)	(307)	(310)	(310)	0	0
Investment segment contributions	280	280	0	0	0	0	0	0	280	280
Dividends and distributions to non-controlling interests in subsidiaries	(31)	(31)	0	0	0	0	0	0	(31)	(31)
Cumulative effect adjustment from adoption of accounting principle	(20)	(20)	0	0	(20)	(20)	(20)	(20)	0	0
Changes in subsidiary equity and other	2	2	0	0	(8)	(8)	(8)	(8)	10	10
Equity at Mar. 31, 2018	$ 11,755	$ 11,782	$ (237)	$ (288)	$ 5,182	$ 5,260	$ 4,945	$ 4,972	$ 6,810	$ 6,810