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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Cumulative effect adjustment from adoption of accounting principle |  |  | $ (29) | $ (47) |
Debt | $ 7,880 |  | 7,880 |  | $ 7,918
Fair value of long-term debt | 8,000 |  | 8,000 |  | 8,200
Restricted cash | 350 |  | 350 |  | 766
Accrued expenses and other liabilities | 1,009 |  | 1,009 |  | 1,033
Deferred tax liability | 896 |  | 896 |  | 924
Net sales | 2,919 | $ 2,332 | 5,356 | 4,704 |
Cost of goods sold | 2,510 | 2,068 | 4,601 | 4,120 |
Accounts receivable, net | 682 |  | 682 |  | 612
Total assets | 30,190 |  | 30,190 |  | 31,801
Total liabilities | 17,742 |  | 17,742 |  | 20,433
Restricted cash |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Restricted cash | 286 |  | 286 |  | 574
Automotive Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt | 324 |  | 324 |  | 340
Restricted cash | 0 |  | 0 |  | 0
Deferred revenue | 42 |  | 42 |  | 42
Deferred revenue, recognized | 6 |  | 12 |  |
Deferred revenue, noncurrent | 30 |  | 30 |  |
Net sales | 602 | 569 | 1,160 | 1,098 |
Cost of goods sold | 384 | 372 | 746 | 729 |
Accounts receivable, net | 266 |  | 266 |  | 224
Total assets | 3,142 |  | 3,142 |  | 3,011
Total liabilities | 1,265 |  | 1,265 |  | 1,284
Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt | 1,167 |  | 1,167 |  | 1,166
Restricted cash | 0 |  | 0 |  | 0
Deferred revenue | 11 |  | 11 |  | 34
Deferred revenue, recognized | 20 |  | 32 |  |
Net sales | 1,914 | 1,434 | 3,451 | 2,942 |
Cost of goods sold | 1,776 | 1,416 | 3,206 | 2,834 |
Accounts receivable, net | 190 |  | 190 |  | 178
Total assets | 4,716 |  | 4,716 |  | 4,700
Total liabilities | 2,273 |  | 2,273 |  | 2,291
Railcar Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt | 533 |  | 533 |  | 546
Restricted cash | 19 |  | 19 |  | 19
Revenue, remaining performance obligation | 241 |  | 241 |  |
Revenue, current portion of remaining performance obligation | 98 |  | 98 |  |
Revenue, non-current portion of remaining performance obligation | 143 |  | 143 |  |
Net sales | 90 | 55 | 154 | 116 |
Cost of goods sold | 84 | 50 | 142 | 105 |
Accounts receivable, net | 38 |  | 38 |  | 44
Total assets | 1,481 |  | 1,481 |  | 1,487
Total liabilities | 810 |  | 810 |  | 808
Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Cumulative effect adjustment from adoption of accounting principle |  |  | $ (29) | (47) |
Percentage of equity ownership in operating subsidiary |  |  | 99.00% |  |
Debt | 7,884 |  | $ 7,884 |  | 7,923
Restricted cash | 350 |  | 350 |  | 766
Accrued expenses and other liabilities | 1,009 |  | 1,009 |  | 1,033
Deferred tax liability | 896 |  | 896 |  | 924
Net sales | 2,919 | 2,332 | 5,356 | 4,704 |
Cost of goods sold | 2,510 | 2,068 | 4,601 | 4,120 |
Accounts receivable, net | 682 |  | 682 |  | 612
Total assets | 30,222 |  | 30,222 |  | 31,833
Total liabilities | 17,746 |  | 17,746 |  | 20,438
Cash and cash equivalents | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 286 |  | 286 |  | 223
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 | 316 |  | 316 |  | 734
Investments | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 8,215 |  | 8,215 |  | 9,615
Due from brokers | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 334 |  | 334 |  | 506
Property, plant and equipment, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 3,098 |  | 3,098 |  | 3,191
Inventories, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 433 |  | 433 |  | 385
Intangible assets, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 288 |  | 288 |  | 298
Other assets | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 840 |  | 840 |  | 48
Accounts payable, accrued expenses and other liabilities | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 934 |  | 934 |  | 1,816
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 368 |  | 368 |  | 1,023
Due to brokers | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 0 |  | 0 |  | 1,057
Debt | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 1,167 |  | 1,167 |  | $ 1,166
Selling, general and administrative |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Prior period reclassification adjustment |  | (1) |  | (2) |
Other income |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Prior period reclassification adjustment |  | (1) |  | (2) |
Net cash provided by operating activities |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Prior period reclassification adjustment |  |  |  | (215) |
Difference between Revenue Guidance in Effect before and after adoption |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Total assets | 32 |  | 32 |  |
Difference between Revenue Guidance in Effect before and after adoption | Automotive Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Net sales | 16 | 18 | 32 | 36 |
Cost of goods sold | 16 | $ 18 | 32 | $ 36 |
Accounts receivable, net | 21 |  | 21 |  |
Total liabilities | (29) |  | (29) |  |
Difference between Revenue Guidance in Effect before and after adoption | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Accrued expenses and other liabilities | (21) |  | (21) |  |
Extended warranties | Difference between Revenue Guidance in Effect before and after adoption | Automotive Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Accrued expenses and other liabilities | (42) |  | (42) |  |
Deferred tax liability | $ 10 |  | $ 10 |  |

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- Definition The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5710-111685 + Details
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