Schedule I - Condensed Financial Information of Parent - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]
Net loss	$ (326)	$ (542)	$ (1,012)
Adjustments to reconcile net loss to net cash used in operating activities:
Other, net	31	3	(84)
Net cash used in operating activities	(313)	832	3,736
Net cash provided by (used in) by investing activities	(402)	(215)	(290)
Partnership contributions	85	104	185
Proceeds from borrowings	18	362	683
Proceeds from sale of (purchase of) additional interests in consolidated subsidiaries	(72)	(13)	158
Investment segment distributions	(526)	(511)	(2,199)
Net cash provided by (used in) financing activities	(1,105)	(1,323)	(2,385)
Net change in cash and cash equivalents and restricted cash and restricted cash equivalents	(1,820)	(707)	1,060
Cash and cash equivalents and restricted cash and restricted cash equivalents, beginning of period	5,239	5,946	4,886
Cash and cash equivalents and restricted cash and restricted cash equivalents, end of period	3,419	5,239	5,946
Icahn Enterprises (Parent)
Condensed Financial Statements, Captions [Line Items]
Net loss	(299)	(445)	(684)
Adjustments to reconcile net loss to net cash used in operating activities:
Equity in (gain) loss of subsidiary	(37)	136	411
Gain on extinguishment of debt	(4)	(8)	(13)
Other, net	6	30	(3)
Net cash used in operating activities	(334)	(287)	(289)
Net investment in and advances from subsidiaries	571	320	629
Net cash provided by (used in) by investing activities	571	320	629
Partnership distributions	(288)	(391)	(307)
Partnership contributions	85	104	185
Proceeds from borrowings	495	1,266	699
Repayments of borrowings	(529)	(1,397)	(1,159)
Investment segment distributions		394	242
Debt issuance costs and other		(9)
Net cash provided by (used in) financing activities	$ (237)	$ (33)	$ (340)