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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 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 | $ 7,907 |  | 7,907 |  | $ 7,918
Fair value of long-term debt | 8,100 |  | 8,100 |  | 8,200
Restricted cash | 801 |  | 801 |  | 766
Accrued expenses and other liabilities | 1,069 |  | 1,069 |  | 1,033
Deferred tax liability | 787 |  | 787 |  | 924
Net sales | 2,864 | $ 2,404 | 8,220 | 7,107 |
Cost of goods sold | 2,406 | 2,054 | 7,007 | 6,174 |
Accounts receivable, net | 700 |  | 700 |  | 612
Total assets | 30,975 |  | 30,975 |  | 31,801
Total liabilities | 18,639 |  | 18,639 |  | 20,433
Cash held at consolidated affiliated partnerships |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Restricted cash | 64 |  | 64 |  | 192
Restricted cash |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Restricted cash | 737 |  | 737 |  | 574
Automotive Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt | 359 |  | 359 |  | 340
Restricted cash | 0 |  | 0 |  | 0
Deferred revenue | 42 |  | 42 |  | 42
Deferred revenue, recognized | 5 |  | 18 |  |
Deferred revenue, noncurrent | 36 |  | 36 |  |
Net sales | 600 | 604 | 1,760 | 1,702 |
Cost of goods sold | 373 | 396 | 1,119 | 1,125 |
Accounts receivable, net | 259 |  | 259 |  | 224
Total assets | 3,164 |  | 3,164 |  | 3,011
Total liabilities | 1,273 |  | 1,273 |  | 1,284
Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt | 1,168 |  | 1,168 |  | 1,166
Restricted cash | 0 |  | 0 |  | 0
Deferred revenue | 32 |  | 32 |  | 34
Deferred revenue, recognized | 2 |  | 34 |  |
Revenue, remaining performance obligation | 12 |  | 12 |  |
Revenue, current portion of remaining performance obligation | 6 |  | 6 |  |
Revenue, non-current portion of remaining performance obligation | 3 |  | 3 |  |
Net sales | 1,935 | 1,454 | 5,386 | 4,395 |
Cost of goods sold | 1,742 | 1,357 | 4,948 | 4,191 |
Accounts receivable, net | 214 |  | 214 |  | 178
Total assets | 4,852 |  | 4,852 |  | 4,700
Total liabilities | 2,315 |  | 2,315 |  | 2,291
Railcar Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Debt | 527 |  | 527 |  | 546
Restricted cash | 19 |  | 19 |  | 19
Deferred revenue | 2 |  | 2 |  | 2
Revenue, remaining performance obligation | 963 |  | 963 |  |
Revenue, current portion of remaining performance obligation | 184 |  | 184 |  |
Revenue, non-current portion of remaining performance obligation | 779 |  | 779 |  |
Unbilled revenue | 7 |  | 7 |  | 4
Net sales | 40 | 68 | 194 | 184 |
Cost of goods sold | 42 | 65 | 184 | 170 |
Accounts receivable, net | 40 |  | 40 |  | 44
Total assets | 1,498 |  | 1,498 |  | 1,487
Total liabilities | 822 |  | 822 |  | 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 | 7,911 |  | $ 7,911 |  | 7,923
Restricted cash | 801 |  | 801 |  | 766
Accrued expenses and other liabilities | 1,069 |  | 1,069 |  | 1,033
Deferred tax liability | 787 |  | 787 |  | 924
Net sales | 2,864 | 2,404 | 8,220 | 7,107 |
Cost of goods sold | 2,406 | 2,054 | 7,007 | 6,174 |
Accounts receivable, net | 700 |  | 700 |  | 612
Total assets | 31,007 |  | 31,007 |  | 31,833
Total liabilities | 18,643 |  | 18,643 |  | 20,438
Cash and cash equivalents | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 460 |  | 460 |  | 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 | 637 |  | 637 |  | 734
Investments | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 8,794 |  | 8,794 |  | 9,615
Due from brokers | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 338 |  | 338 |  | 506
Property, plant and equipment, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 3,034 |  | 3,034 |  | 3,191
Inventories, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 427 |  | 427 |  | 385
Intangible assets, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 283 |  | 283 |  | 298
Other assets | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 381 |  | 381 |  | 226
Accounts payable, accrued expenses and other liabilities | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 1,656 |  | 1,656 |  | 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 | 625 |  | 625 |  | 1,023
Due to brokers | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 243 |  | 243 |  | 1,057
Debt | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 1,168 |  | 1,168 |  | $ 1,166
Selling, general and administrative |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Prior period reclassification adjustment |  | (1) |  | (3) |
Other income (loss), net |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Prior period reclassification adjustment |  | (1) |  | (3) |
Net cash provided by operating activities |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Prior period reclassification adjustment |  |  |  | 195 |
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 | 15 | 14 | 47 | 50 |
Cost of goods sold | 15 | $ 14 | 47 | $ 50 |
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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