Net Income (Loss) Per LP Unit (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 23, 2026 $ / shares	Dec. 31, 2025 USD ($) item $ / shares shares	Dec. 31, 2024 USD ($) item $ / shares shares	Dec. 31, 2023 USD ($) item $ / shares shares	Nov. 06, 2023 USD ($)	May 09, 2023 USD ($)
Net Income (Loss) Per LP Unit [Line Items]
Net Income (Loss)		$ (299)	$ (445)	$ (684)
Net loss attributable to Icahn Enterprises allocated to limited partners (98.01% allocation)		$ (293)	$ (436)	$ (670)
Basic loss per LP unit (in dollars per share) | $ / shares		$ (0.52)	$ (0.94)	$ (1.75)
Basic weighted average LP units outstanding (in shares) | shares		562,000,000	466,000,000	382,000,000
Diluted loss per LP unit (in dollars per share) | $ / shares		$ (0.52)	$ (0.94)	$ (1.75)
Diluted weighted average LP units outstanding (in shares) | shares		562,000,000	466,000,000	382,000,000
Limited partners: Depositary units issued | shares		637,209,452	522,736,315	429,033,241
Units distributed to LP unitholders | shares		104,405,738	87,896,088
Aggregate cash distributions to depositary unit holders		$ 282	$ 383
Partners' Capital Account, Units, Sale of Units | shares		10,067,399	5,806,986
Proceeds from sale of interest in partnership unit		$ 84
Aggregate gross sale proceeds		363
Fixed-rate senior unsecured notes, repurchase program authorized amount					$ 500	$ 500
Depositary units, repurchase program authorized amount		500				$ 500
Repurchased senior notes		50			$ 269
Total cash paid		46	$ 168
Remaining authorized amount		$ 450
Number of distributions | item		4	4	4
Amount of distribution per share | $ / shares		$ 2	$ 3.5
Subsequent event
Net Income (Loss) Per LP Unit [Line Items]
Distribution declared per LP unit | $ / shares	$ 0.5
Limited partners
Net Income (Loss) Per LP Unit [Line Items]
Net loss attributable to Icahn Enterprises allocated to limited partners (98.01% allocation)		$ (293)	$ (436)	$ (670)
Units distributed to LP unitholders | shares		104,405,738	87,896,088
Mr. Icahn and affiliates
Net Income (Loss) Per LP Unit [Line Items]
Limited partners: Depositary units issued | shares		549,400,539	450,788,170	367,879,902
Units distributed to LP unitholders | shares		98,612,369	82,908,268
Aggregate cash distributions to depositary unit holders		$ 175	$ 220
Public unitholders
Net Income (Loss) Per LP Unit [Line Items]
Limited partners: Depositary units issued | shares		87,808,913	71,948,145	61,153,339
Units distributed to LP unitholders | shares		5,793,369	4,987,820
Partners' Capital Account, Units, Sale of Units | shares		10,067,399	5,806,986
Icahn Enterprises Holdings LP
Net Income (Loss) Per LP Unit [Line Items]
Affiliate ownership interest		98.01%	98.01%	98.01%