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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 01, 2017 | Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Debt | $ 11,198 |  | $ 11,198 |  |  | $ 11,119
Fair value of long-term debt | 11,500 |  | 11,500 |  |  | 11,200
Restricted cash | 999 |  | 999 |  |  | 804
Restricted cash |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Restricted cash | 866 |  | 866 |  |  | 686
Automotive Segment |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Debt | 3,451 |  | 3,451 |  |  | 3,259
Restricted cash | 0 |  | 0 |  |  | 2
Gross amount of transferred receivables under factoring arrangements | 607 |  | 607 |  |  | 487
Gross amount of transferred receivables under factoring arrangements qualifying as sales | 600 |  | 600 |  |  | 485
Proceeds from transferred receivables under factoring arrangements qualifying as sales | 424 | $ 311 | 1,300 | $ 1,200 |  |
Expenses associated with transferred receivables under factoring arrangements | 2 | $ 2 | $ 10 | $ 9 |  |
Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 99.00% |  |  |
Debt | 11,202 |  | $ 11,202 |  |  | 11,122
Restricted cash | 999 |  | 999 |  |  | 804
Cash and cash equivalents | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 630 |  | 630 |  |  | 370
Cash held at consolidated affiliated partnerships and restricted cash | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 951 |  | 951 |  |  | 752
Investments | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 9,022 |  | 9,022 |  |  | 9,219
Due from brokers | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 1,006 |  | 1,006 |  |  | 1,482
Property, plant and equipment, net | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 3,215 |  | 3,215 |  |  | 3,331
Inventories | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 340 |  | 340 |  |  | 349
Intangible assets, net | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 303 |  | 303 |  |  | 318
Other assets | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Assets of VIE's | 69 |  | 69 |  |  | 110
Accounts payable, accrued expenses and other liabilities | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Liabilities of VIE's | 2,302 |  | 2,302 |  |  | 1,769
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Liabilities of VIE's | 1,258 |  | 1,258 |  |  | 1,139
Due to brokers | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Liabilities of VIE's | 603 |  | 603 |  |  | 3,725
Debt | Icahn Enterprises Holdings |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Liabilities of VIE's | $ 1,166 |  | $ 1,166 |  |  | $ 1,165
Equity |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |
Effect of adopting new accounting principle on consolidated financial statements |  |  |  |  | $ 47 |

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