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Summary of Significant Accounting Policies Variable Interest Entities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Energy Segment | Cash and cash equivalents |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of assets of VIE's | $ 370 | $ 237
Energy Segment | Property, plant and equipment |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of assets of VIE's | 3,331 | 2,674
Energy Segment | Inventories |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of assets of VIE's | 349 | 290
Energy Segment | Goodwill |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of assets of VIE's | 0 | 574
Energy Segment | Intangible assets, net |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of assets of VIE's | 318 | 337
Energy Segment | Other assets |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of assets of VIE's | 85 | 115
Energy Segment | Accounts payable, accrued expenses and other liabilities |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of liabilities of VIE's | 534 | 333
Energy Segment | Debt |  |
Variable Interest Entity [Line Items] |  |
Carrying amount of liabilities of VIE's | $ 1,165 | $ 667
Icahn Enterprises Holdings |  |
Variable Interest Entity [Line Items] |  |
Percentage of equity ownership in operating subsidiary | 99.00% |

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