Schedule I - Condensed Financial Information of Parent - Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net loss	$ (500)	$ (2,468)	$ (1,791)
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Other, net	50	12	18
Net cash used in operating activities	321	(416)	(1,460)
Net cash (used in) provided by investing activities	528	(581)	586
Partnership contributions	835	102	55
Proceeds from borrowings	1,165	1,946	810
Net cash (used in) provided by financing activities	293	(653)	566
Net change in cash and cash equivalents and restricted cash and restricted cash equivalents	1,145	(1,654)	(393)
Cash and cash equivalents and restricted cash and restricted cash equivalents, beginning of period	3,291	4,945	5,338
Cash and cash equivalents and restricted cash and restricted cash equivalents, end of period	4,436	3,291	4,945
Icahn Enterprises (Parent)
Condensed Financial Statements, Captions [Line Items]
Net loss	518	1,653	1,098
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Equity in loss (income) of subsidiary	198	1,307	750
Loss (gain) on extinguishment of debt	(3)	4	(2)
Other, net	(15)	(23)	(25)
Net cash used in operating activities	(338)	(365)	(375)
Net investment in and advances from subsidiaries	(366)	1,276	(363)
Net cash (used in) provided by investing activities	(366)	1,276	(363)
Partnership distributions	(134)	(526)	(112)
Partnership contributions	835	102	55
Proceeds from borrowings	1,214	866	2,507
Repayments of borrowings	(1,205)	(1,350)	(1,700)
Debt issuance costs and other	(6)	(3)	(12)
Net cash (used in) provided by financing activities	$ 704	$ (911)	$ 738