Cover page. Document Information [Table] Document Information [Table] Legal Entity [Axis] Entity [Domain] Entity [Domain] Icahn Enterprises Holdings [Member] Icahn Enterprises Holdings [Member] Icahn Enterprises Holdings Document Information [Line Items] Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Current Fiscal Year End Date Current Fiscal Year End Date Document Annual Report Document Annual Report Document Transition Report Document Transition Report Entity Central Index Key Entity Central Index Key Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company en-US ICFR Auditor Attestation Flag Icfr Auditor Attestation Flag Icfr Auditor Attestation Flag Entity Shell Company Entity Shell Company Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Assets [Abstract] Assets [Abstract] ASSETS Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Restricted Cash and Cash Equivalents Cash held at consolidated affiliated partnerships and restricted cash Restricted cash Investments Investments Amount receivable from brokers as at the end of the reporting period. Due from Brokers Due from brokers Accounts Receivable, after Allowance for Credit Loss Accounts receivable, net Inventory, Net Inventories, net Property, Plant and Equipment, Net Property, plant and equipment, net Property, plant and equipment, net Unrealized Gain On Derivative Contracts. Unrealized Gain On Derivative Contracts Unrealized gain on derivative contracts Derivative contracts, at fair value (asset) Goodwill Goodwill Intangible Assets, Net (Excluding Goodwill) Intangible assets, net Other Assets Other assets Assets Total Assets Total Assets Liabilities and Equity [Abstract] LIABILITIES AND EQUITY AccountsPayableCurrentAndNoncurrent Accounts payable Accrued Liabilities Accrued expenses and other liabilities Accounts payable, accrued expenses and other liabilities Deferred Income Tax Liabilities, Net Deferred tax liability Derivative Liability Derivative contracts, at fair value (liability) Unrealized loss on derivative contracts Financial Instruments Sold, Not yet Purchased, at Fair Value Securities sold, not yet purchased, at fair value Due to Correspondent Brokers Due to brokers Debt and Lease Obligation Debt Debt and Lease Obligation, Total Liabilities Total liabilities Total liabilities Commitments and Contingencies Commitments and contingencies (Note 18) Commitments and contingencies (Note 3) Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Equity: Limited Partners' Capital Account Limited partner General Partners' Capital Account General partner Partners' Capital Equity attributable to Icahn Enterprises Equity attributable to Icahn Enterprises Partners' Capital Attributable to Noncontrolling Interest Equity attributable to non-controlling interests Partners' Capital, Including Portion Attributable to Noncontrolling Interest Total equity Total equity Total equity Total equity Liabilities and Equity Total Liabilities and Equity Total Liabilities and Equity Stockholders' Equity Attributable to Parent [Abstract] Equity: Limited Partners' Capital Account, Units Issued Limited partners: Depositary units issued Limited Partners' Capital Account, Units Outstanding Limited partners: Depositary units outstanding Income Statement [Abstract] Revenues [Abstract] Revenues: Net Sales. Net Sales Net sales/Other revenue from operations Other operating revenue Other operating revenue Other revenues from operations Debt and Equity Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss Net (loss) gain from investment activities Interest and Dividend Income, Operating Interest and dividend income Gain (Loss) on Disposition of Assets (Gain) loss on disposition of assets (Loss) gain on disposition of assets, net (Loss) gain on disposition of assets, net (Loss) gain on disposition of assets, net Other Nonoperating Income (Expense) Other income, net Other income (loss), net Other (loss) income, net Revenues Total revenues Total revenues Costs and Expenses [Abstract] Expenses: Cost Of Goods Sold (New). Cost Of Goods Sold (New) Cost of goods sold/Other expenses from operations Cost of other revenue from operations Cost of other revenue from operations Other expenses from operations Other expenses from operations Selling, General and Administrative Expense Selling, general and administrative Restructuring Charges Restructuring, net Asset Impairment Charges Impairment Interest Expense Interest expense Costs and Expenses Total Expenses Total Expenses Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (loss) from continuing operations before income tax (expense) benefit (Loss) income before income tax benefit (expense) Income before income tax benefit (expense) Income Tax Expense (Benefit) Income tax (expense) benefit Income tax benefit (expense) Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net income (loss) from continuing operations (Loss) income from continuing operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Loss (income) from discontinued operations (Loss) income from discontinued operations Income from discontinued operations Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net (loss) income Net (loss) income Net Income (Loss) Attributable to Noncontrolling Interest Less: net (loss) income attributable to non-controlling interests Net Income (Loss) Attributable to Parent Net income (loss) attributable to Icahn Enterprises Net (loss) income attributable to Icahn Enterprises Net (loss) income attributable to investee shareholders Net Income (Loss) Attributable to Parent [Abstract] Net (loss) income attributable to Icahn Enterprises allocated to: Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Net income (loss) from continuing operations attributable to Icahn Enterprises Continuing operations Net (loss) income attributable to Icahn Enterprises from continuing operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Discontinued operations Income from discontinued operations attributable to Icahn Enterprises Net (loss) income attributable to Icahn Enterprises from discontinued operations Net Income (Loss) Allocated to Limited Partners Limited partners Net Income (Loss) Allocated to General Partners General partner Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax [Abstract] Basic and diluted (loss) income per LP unit: Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax Continuing operations Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted Discontinued operations Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax Basic and diluted (loss) income per LP unit Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted Basic and diluted weighted average LP units outstanding Distributions Per Limited Partnership Unit Outstanding, Basic Cash distributions declared per LP unit Statement of Comprehensive Income [Abstract] Partner Type [Axis] Partner Type Of Partners Capital Account Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Limited Partner [Member] Limited partners General Partner [Member] General partner Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive (loss) income, net of tax: Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Post-retirement benefits and other Post-employment benefits Other Comprehensive Income (Loss), Net of Tax Other comprehensive loss Other comprehensive (loss) income, net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive (loss) income Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Less: Comprehensive (loss) income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive (loss) income attributable to Icahn Enterprises Statement of Partners' Capital [Abstract] Parent [Member] Total Partners' Equity Noncontrolling Interest [Member] Non-controlling Interests Increase (Decrease) in Partners' Capital [Roll Forward] Increase (Decrease) in Equity Partners' Capital Account, Distributions Partnership distributions Partners' Capital Account, Contributions Partnership contributions Investment segment contributions Investment segment contributions Investment segment contributions Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Dividends and distributions to non-controlling interests in subsidiaries Cumulative Effect on Retained Earnings, Net of Tax Cumulative effect adjustment from adoption of accounting principle Stockholders' Equity, Other Changes in subsidiary equity and other Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities: Adjustments to reconcile net (loss) income to net cash used in operating activities: Gain (Loss) on Investments Net loss (gain) from securities transactions Amount of cash outflow to acquire securities during the reporting period. Payment to Acquire Securities Purchases of securities Amount of cash flows from sale of securities during the reporting period. Proceeds from Sale of Securities Purchases to cover securities sold not yet purchased Purchases to Cover Securities Sold Not Yet Purchased Payments to cover securities sold, not yet purchased Investment Sold, Not yet Purchased, Sale Proceeds Proceeds from securities sold, not yet purchased Increase (Decrease) in Broker-Dealer Related Receivables (Payables), Net Changes in receivables and payables relating to securities transactions Increase (Decrease) in Derivative Assets and Liabilities Changes in unrealized gains/losses on derivative contracts Depreciation, Depletion and Amortization Depreciation and amortization Increase (Decrease) in Deferred Income Taxes Deferred taxes Other Operating Activities, Cash Flow Statement Other, net Increase (Decrease) in Operating Capital [Abstract] Changes in other operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable, net Increase (Decrease) in Inventories Inventories, net Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Other Accrued Liabilities Accrued expenses and other liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash (used in) provided by operating activities from continuing operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Net cash provided by operating activities from discontinued operations Net Cash Provided by (Used in) Operating Activities Net cash used in operating activities Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from investing activities: Payments to Acquire Property, Plant, and Equipment Capital expenditures Capital expenditures Amount of turnaround expenditures paid during the period. Payments For Turnaround Expenditures Turnaround expenditures Payments to Acquire Businesses, Net of Cash Acquired Acquisition of businesses, net of cash acquired Payments to Acquire Investments Purchases of investments Proceeds from Sale, Maturity and Collection of Investments Proceeds from sale of investments Proceeds from Sales of Business, Affiliate and Productive Assets Proceeds from disposition of businesses and assets Payments for (Proceeds from) Other Investing Activities Other, net Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net cash (used in) provided by investing activities from continuing operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Net cash used in investing activities from discontinued operations Net Cash Provided by (Used in) Investing Activities Net cash (used in) provided by investing activities Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Cash flows from financing activities: Proceeds from Contributions from Affiliates Investment segment contributions from non-controlling interests Proceeds from Partnership Contribution Partnership contributions Payments of Dividends Partnership distributions Payments for additional interests in consolidated subsidiaries Payments For Additional Interests In Consolidated Subsidiaries Purchase of additional interests in consolidated subsidiaries Amount of cash outflow on dividends and distribution to non controlling interest. Payments of Dividends and Distributions to Non Controlling Interests in Subsidiaries Dividends and distributions to non-controlling interests in subsidiaries Proceeds from Issuance of Unsecured Debt Proceeds from Holding Company senior unsecured notes Repayments of Unsecured Debt Repayments of Holding Company senior unsecured notes Proceeds from Other Debt Proceeds from subsidiary borrowings Proceeds from borrowings Repayments of Other Debt Repayments of subsidiary borrowings Proceeds from (Payments for) Other Financing Activities Other, net Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash (used in) provided by financing activities from continuing operations Cash Provided by (Used in) Financing Activities, Discontinued Operations Net cash used in financing activities from discontinued operations Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Net cash (used in) provided by financing activities Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rate changes on cash and cash equivalents and restricted cash and restricted cash equivalents Net Change in Cash of Assets Held for Sale Net Change in Cash of Assets Held for Sale Add back change in cash and restricted cash of assets held for sale Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net change in cash and cash equivalents and restricted cash and restricted cash equivalents Net (decrease) increase in cash and cash equivalents and restricted cash and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents and restricted cash and restricted cash equivalents, end of period Cash and cash equivalents and restricted cash and restricted cash equivalents, beginning of period Description of Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Description of Business Accounting Policies [Abstract] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Basis of Presentation and Summary of Significant Accounting Policies Related Party Transactions [Abstract] Related Party Transactions Disclosure [Text Block] Related Party Transactions Schedule of Investments [Abstract] Investments and Other Noncurrent Assets [Text Block] Investments Fair Value Disclosures [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Derivative Instruments and Hedging Activities Disclosure [Abstract] Financial Instruments Disclosure [Text Block] Financial Instruments