Schedule I - Condensed Financial Information of Parent - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]
Net loss	$ (1,012)	$ (25)	$ (500)
Adjustments to reconcile net loss to net cash used in operating activities:
Other, net	(84)	72	50
Net cash used in operating activities	3,736	1,055	321
Net cash (used in) provided by investing activities	(290)	(260)	528
Partnership contributions	185	768	835
Proceeds from borrowings	683	115	1,165
Investment segment distributions	(2,199)	(23)	(5)
Net cash provided by (used in) financing activities	(2,385)	(344)	293
Net change in cash and cash equivalents and restricted cash and restricted cash equivalents	1,060	450	1,145
Cash and cash equivalents and restricted cash and restricted cash equivalents, beginning of period	4,886	4,436	3,291
Cash and cash equivalents and restricted cash and restricted cash equivalents, end of period	5,946	4,886	4,436
Icahn Enterprises (Parent)
Condensed Financial Statements, Captions [Line Items]
Net loss	(684)	(183)	(518)
Adjustments to reconcile net loss to net cash used in operating activities:
Equity in loss of subsidiary	411	(108)	198
(Gain) loss on extinguishment of debt	(13)	(1)	(3)
Other, net	(3)	(14)	(15)
Net cash used in operating activities	(289)	(306)	(338)
Net investment in and advances from subsidiaries	629	264	(366)
Net cash (used in) provided by investing activities	629	264	(366)
Partnership distributions	(307)	(226)	(134)
Partnership contributions	185	768	835
Proceeds from borrowings	699		1,214
Repayments of borrowings	(1,159)	(500)	(1,205)
Investment segment distributions	242
Debt issuance costs and other			(6)
Net cash provided by (used in) financing activities	$ (340)	$ 42	$ 704