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Basis of Presentation and Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Jan. 01, 2018
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt | $ 7,326 |  |  |  | $ 7,372 |  |  |  | $ 7,326 | $ 7,372 |  |  |
Fair value of long-term debt | 7,300 |  |  |  | 7,600 |  |  |  | $ 7,300 | 7,600 |  |  |
Affiliate ownership interest |  |  |  |  |  |  |  |  | 98.01% |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2,682 |  |  |  | 747 |  |  |  | $ 2,682 | 747 |  |  |
Portion of inventory under LIFO method | 846 |  |  |  | 900 |  |  |  | 846 | 900 |  |  |
Post-retirement benefit liability | 77 |  |  |  | 80 |  |  |  | 77 | 80 |  |  |
Accumulated other comprehensive loss | (84) |  |  |  | (1,384) |  |  |  | (84) | (1,384) |  |  |
Cumulative effect adjustment from adoption of accounting principal |  |  |  |  |  |  |  |  | (29) | (47) |  |  |
Accounts receivable, net | 474 |  |  |  | 473 |  |  |  | 474 | 473 |  |  |
Accrued expenses and other liabilities | 900 |  |  |  | 984 |  |  |  | 900 | 984 |  |  |
Deferred tax liability | 676 |  |  |  | 732 |  |  |  | 676 | 732 |  |  |
Net sales | 2,578 | $ 2,815 | $ 2,820 | $ 2,363 | 2,385 | $ 2,334 | $ 2,277 | $ 2,310 | 10,576 | 9,306 | $ 7,740 |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 8,947 | 8,258 | 6,837 |  |
Assets | 23,396 |  |  |  | 31,801 |  |  |  | 23,396 | 31,801 |  |  |
Liabilities | 10,491 |  |  |  | 20,433 |  |  |  | 10,491 | 20,433 |  |  |
Cash held at consolidated affiliated partnerships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2,648 |  |  |  | 192 |  |  |  | 2,648 | 192 |  |  |
Restricted cash |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 34 |  |  |  | 555 |  |  |  | 34 | 555 |  |  |
Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt | 372 |  |  |  | 340 |  |  |  | 372 | 340 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |
Deferred revenue | 42 |  |  |  |  |  |  |  | 42 |  |  |  | $ 42
Revenue recognition during period of previously deferred revenue |  |  |  |  |  |  |  |  | 22 |  |  |  |
Deferred revenue expected to be earned within one year | 22 |  |  |  |  |  |  |  | 22 |  |  |  |
Accounts receivable, net | 149 |  |  |  | 128 |  |  |  | 149 | 128 |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,295 | 2,225 | 2,079 |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 1,502 | 1,540 | 1,430 |  |
Assets | 3,024 |  |  |  | 3,011 |  |  |  | 3,024 | 3,011 |  |  |
Liabilities | 1,277 |  |  |  | 1,284 |  |  |  | 1,277 | 1,284 |  |  |
Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt | 1,170 |  |  |  | 1,166 |  |  |  | 1,170 | 1,166 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 0 |  |  |  | 0 |  |  |  | 0 | 0 |  |  |
Planned major maintenance |  |  |  |  |  |  |  |  | 10 | 83 | 38 |  |
Remaining performance obligation for contracts with an original expected duration of more than one year | 11 |  |  |  |  |  |  |  | 11 |  |  |  |
Remaining performance obligation expected to be recognized as revenue within one year | 5 |  |  |  |  |  |  |  | 5 |  |  |  |
Deferred revenue | 69 |  |  |  |  |  |  |  | 69 |  |  |  | 34
Revenue recognition during period of previously deferred revenue |  |  |  |  |  |  |  |  | 34 |  |  |  |
Accounts receivable, net | 169 |  |  |  | 179 |  |  |  | 169 | 179 |  |  |
Net sales |  |  |  |  |  |  |  |  | 7,124 | 5,988 | 4,782 |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 6,453 | 5,799 | 4,637 |  |
Assets | 4,738 |  |  |  | 4,700 |  |  |  | 4,738 | 4,700 |  |  |
Liabilities | 2,195 |  |  |  | 2,291 |  |  |  | 2,195 | 2,291 |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  | (19) | (446) |  |
Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  | 32
Difference between Revenue Guidance in Effect before and after Topic 606 | Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  |  |  | 21
Net sales |  |  |  |  |  |  |  |  | 62 |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | $ 62 |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (29)
Selling, general and administrative |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  | (4) | (4) |  |
Other Income, net |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prior Period Reclassification Adjustment |  |  |  |  |  |  |  |  |  | (4) | (4) |  |
Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 99.00% |  |  |  |
Debt | 7,330 |  |  |  | 7,377 |  |  |  | $ 7,330 | 7,377 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2,682 |  |  |  | 747 |  |  |  | 2,682 | 747 |  |  |
Cumulative effect adjustment from adoption of accounting principal |  |  |  |  |  |  |  |  | (29) | (47) |  |  |
Accounts receivable, net | 474 |  |  |  | 473 |  |  |  | 474 | 473 |  |  |
Accrued expenses and other liabilities | 900 |  |  |  | 984 |  |  |  | 900 | 984 |  |  |
Deferred tax liability | 676 |  |  |  | 732 |  |  |  | 676 | 732 |  |  |
Net sales |  |  |  |  |  |  |  |  | 10,576 | 9,306 | 7,740 |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 8,947 | 8,258 | $ 6,837 |  |
Assets | 23,428 |  |  |  | 31,833 |  |  |  | 23,428 | 31,833 |  |  |
Liabilities | $ 10,495 |  |  |  | $ 20,438 |  |  |  | $ 10,495 | $ 20,438 |  |  |
CVR Energy |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 70.80% |  |  |  |
Extended warranties | Difference between Revenue Guidance in Effect before and after Topic 606 | Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (42)
Deferred tax liability |  |  |  |  |  |  |  |  |  |  |  |  | $ 10
Subsequent event | Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | $ 639 |
Operating lease liability |  |  |  |  |  |  |  |  |  |  |  | 674 |
Subsequent event | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | 53 |
Operating lease liability |  |  |  |  |  |  |  |  |  |  |  | 53 |
Finance lease right-of-use asset |  |  |  |  |  |  |  |  |  |  |  | $ 26 |
Minimum | Nitrogenous fertilizer manufacturing | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Planned major maintenance, frequency (in years) |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Minimum | Petroleum refineries | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Planned major maintenance, frequency (in years) |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Minimum | CVR Energy |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Performance obligation payment terms |  |  |  |  |  |  |  |  | 2 days |  |  |  |
Maximum | Nitrogenous fertilizer manufacturing | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Planned major maintenance, frequency (in years) |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Maximum | Petroleum refineries | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Planned major maintenance, frequency (in years) |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Maximum | CVR Energy |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Performance obligation payment terms |  |  |  |  |  |  |  |  | 30 days |  |  |  |
Icahn Enterprises G.P. |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  |  |  |  |  |  |  | 1.99% |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Icahn Enterprises G.P. | Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  |  |  |  |  |  |  | 1.00% |  |  |  |

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