Net Income (Loss) Per LP Unit (Details) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended			3 Months Ended		9 Months Ended
	Nov. 06, 2024	Aug. 05, 2024	May 06, 2024	Feb. 26, 2024	Sep. 30, 2024	Jun. 30, 2024	Apr. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 26, 2024	May 09, 2023
Net Income (Loss) Per LP Unit [Line Items]
Net Income (Loss)								$ 22	$ (6)	$ (347)	$ (545)
Net (loss) income attributable to Icahn Enterprises allocated to limited partners (98.01% allocation)								$ 22	$ (6)	$ (340)	$ (534)
Basic income (loss) per LP unit (in dollars per share)								$ 0.05	$ (0.01)	$ (0.75)	$ (1.47)
Basic weighted average LP units outstanding (in shares)								477,000,000	394,000,000	452,000,000	364,000,000
Diluted income (loss) per LP unit (in dollars per share)								$ 0.05	$ (0.01)	$ (0.75)	$ (1.47)
Diluted weighted average LP units outstanding (in shares)								477,000,000	394,000,000	452,000,000	364,000,000
Aggregate cash distributions to depositary unit holders					$ 111	$ 106	$ 97
Fixed-rate senior unsecured notes, repurchase program authorized amount													$ 500
Depositary units, repurchase program authorized amount													$ 500
Repurchased senior notes					269			$ 269		$ 269
Subsequent event
Net Income (Loss) Per LP Unit [Line Items]
Distribution declared per LP unit	$ 0.50
Fixed-rate senior unsecured notes, repurchase program authorized amount	$ 500
Depositary units, repurchase program authorized amount	$ 500
Open market sale agreement entered into November 2022
Net Income (Loss) Per LP Unit [Line Items]
Partners' Capital Account, Units, Sale of Units								233,000		5,806,986
Proceeds from Sale of Interest in Partnership Unit								$ 4		$ 102
Aggregate gross sale proceeds					47			47		47
Open market sale agreement entered into August 2024
Net Income (Loss) Per LP Unit [Line Items]
Sales of depositary units												$ 400
Aggregate gross sale proceeds					$ 400			$ 400		$ 400
Limited partners
Net Income (Loss) Per LP Unit [Line Items]
Distribution declared per LP unit		$ 1.00	$ 1.00	$ 1.00
Units distributed to LP unitholders					28,307,467	21,669,076	19,186,659
Mr. Icahn and affiliates
Net Income (Loss) Per LP Unit [Line Items]
Units distributed to LP unitholders					26,892,947	20,418,007	18,016,077
Aggregate cash distributions to depositary unit holders					$ 60	$ 60	$ 55
Icahn Enterprises Holdings LP
Net Income (Loss) Per LP Unit [Line Items]
Affiliate ownership interest								98.01%	98.01%	98.01%	98.01%