Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net (loss) income	$ (2,468)	$ (1,791)	$ 2,001
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss (income) from discontinued operations		32	(1,764)
Net loss (gain) from securities transactions	926	(570)	476
Purchases of securities	(1,945)	(4,948)	(4,810)
Proceeds from Sale of Securities	4,040	3,648	6,763
Payments to cover securities sold, not yet purchased	(2,336)	(938)	(1,083)
Proceeds from securities sold, not yet purchased	2,913	1,523	1,077
Changes in receivables and payables relating to securities transactions	(1,880)	(220)	(1,195)
Changes in unrealized gains/losses on derivative contracts	(433)	1,181	(1,763)
(Loss) gain on disposition of assets, net	17	(253)	(84)
Depreciation and amortization	510	519	508
Impairment	11	2	92
Deferred taxes	(49)	(89)	(29)
Other, net	60	16	123
Changes in other operating assets and liabilities:
Accounts receivable, net	28	(33)	45
Inventories, net	147	(20)	(86)
Other assets	30	356	316
Accounts payable	(162)	145	(59)
Accrued expenses and other liabilities	175	(20)	(84)
Net cash (used in) provided by operating activities from continuing operations	(416)	(1,460)	444
Net cash provided by operating activities from discontinued operations			479
Net cash (used in) provided by operating activities	(416)	(1,460)	923
Cash flows from investing activities:
Capital expenditures	(199)	(250)	(272)
Turnaround expenditures	(159)	(38)	(8)
Acquisition of businesses, net of cash acquired	(8)	(39)	(15)
Purchases of investments	(337)	(50)	(60)
Proceeds from sale of investments	98	458	1
Proceeds from disposition of businesses and assets	25	505	3,370
Other, net	(1)		8
Net cash (used in) provided by investing activities from continuing operations	(581)	586	3,024
Net cash used in investing activities from discontinued operations			(437)
Net cash (used in) provided by investing activities	(581)	586	2,587
Cash flows from financing activities:
Investment segment contributions from non-controlling interests	13	220	310
Partnership contributions	102	55
Partnership distributions	(526)	(112)	(97)
Purchase of additional interests in consolidated subsidiaries		(241)	(5)
Dividends and distributions to non-controlling interests in subsidiaries	(36)	(119)	(139)
Proceeds from Holding Company senior unsecured notes	866	2,507
Repayments of Holding Company senior unsecured notes	(1,350)	(1,700)
Proceeds from subsidiary borrowings	1,946	810	1,268
Repayments of subsidiary borrowings	(1,644)	(847)	(1,346)
Other, net	(24)	(7)	15
Net cash (used in) provided by financing activities from continuing operations	(653)	566	6
Net cash used in financing activities from discontinued operations			(163)
Net cash (used in) provided by financing activities	(653)	566	(157)
Effect of exchange rate changes on cash and cash equivalents and restricted cash and restricted cash equivalents	(4)	(2)	(7)
Add back change in cash and restricted cash of assets held for sale		(83)	81
Net (decrease) increase in cash and cash equivalents and restricted cash and restricted cash equivalents	(1,654)	(393)	3,427
Cash and cash equivalents and restricted cash and restricted cash equivalents, beginning of period	4,945	5,338	1,911
Cash and cash equivalents and restricted cash and restricted cash equivalents, end of period	3,291	4,945	5,338
Icahn Enterprises Holdings
Cash flows from operating activities:
Net (loss) income	(2,467)	(1,790)	2,002
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Loss (income) from discontinued operations		32	(1,764)
Net loss (gain) from securities transactions	926	(570)	476
Purchases of securities	(1,945)	(4,948)	(4,810)
Proceeds from Sale of Securities	4,040	3,648	6,763
Payments to cover securities sold, not yet purchased	(2,336)	(938)	(1,083)
Proceeds from securities sold, not yet purchased	2,913	1,523	1,077
Changes in receivables and payables relating to securities transactions	(1,880)	(220)	(1,195)
Changes in unrealized gains/losses on derivative contracts	(433)	1,181	(1,763)
(Loss) gain on disposition of assets, net	17	(253)	(84)
Depreciation and amortization	510	519	508
Impairment	11	2	92
Deferred taxes	(49)	(89)	(29)
Other, net	59	15	122
Changes in other operating assets and liabilities:
Accounts receivable, net	28	(33)	45
Inventories, net	147	(20)	(86)
Other assets	30	356	316
Accounts payable	(162)	145	(59)
Accrued expenses and other liabilities	175	(20)	(84)
Net cash (used in) provided by operating activities from continuing operations	(416)	(1,460)	444
Net cash provided by operating activities from discontinued operations			479
Net cash (used in) provided by operating activities	(416)	(1,460)	923
Cash flows from investing activities:
Capital expenditures	(199)	(250)	(272)
Turnaround expenditures	(159)	(38)	(8)
Acquisition of businesses, net of cash acquired	(8)	(39)	(15)
Purchases of investments	(337)	(50)	(60)
Proceeds from sale of investments	98	458	1
Proceeds from disposition of businesses and assets	25	505	3,370
Other, net	(1)		8
Net cash (used in) provided by investing activities from continuing operations	(581)	586	3,024
Net cash used in investing activities from discontinued operations			(437)
Net cash (used in) provided by investing activities	(581)	586	2,587
Cash flows from financing activities:
Investment segment contributions from non-controlling interests	13	220	310
Partnership contributions	102	55
Partnership distributions	(526)	(112)	(97)
Purchase of additional interests in consolidated subsidiaries		(241)	(5)
Dividends and distributions to non-controlling interests in subsidiaries	(36)	(119)	(139)
Proceeds from Holding Company senior unsecured notes	866	2,507
Repayments of Holding Company senior unsecured notes	(1,350)	(1,700)
Proceeds from subsidiary borrowings	1,946	810	1,268
Repayments of subsidiary borrowings	(1,644)	(847)	(1,346)
Other, net	(24)	(7)	15
Net cash (used in) provided by financing activities from continuing operations	(653)	566	6
Net cash used in financing activities from discontinued operations			(163)
Net cash (used in) provided by financing activities	(653)	566	(157)
Effect of exchange rate changes on cash and cash equivalents and restricted cash and restricted cash equivalents	(4)	(2)	(7)
Add back change in cash and restricted cash of assets held for sale		(83)	81
Net (decrease) increase in cash and cash equivalents and restricted cash and restricted cash equivalents	(1,654)	(393)	3,427
Cash and cash equivalents and restricted cash and restricted cash equivalents, beginning of period	4,945	5,338	1,911
Cash and cash equivalents and restricted cash and restricted cash equivalents, end of period	$ 3,291	$ 4,945	$ 5,338