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Investments Investment Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | $ 9,945 |  |  |  | $ 8,337 |  |  |  | $ 9,945 | $ 8,337 |
Securities sold, not yet purchased, at fair value |  | 1,190 |  |  |  | 468 |  |  |  | 1,190 | 468 |
Total Assets |  | 24,639 |  |  |  | 23,489 |  |  |  | 24,639 | 23,489 |
Total liabilities |  | 13,697 |  |  |  | 10,509 |  |  |  | 13,697 | 10,509 |
Total revenues |  | 2,621 | $ 2,320 | $ 2,196 | $ 1,855 | 2,802 | $ 2,569 | $ 3,423 | $ 2,983 | 8,992 | 11,777 | $ 12,619
Net income (loss) attributable to Icahn Enterprises |  | (157) | $ (49) | $ (498) | $ (394) | 930 | $ 118 | $ 302 | $ 132 | (1,098) | 1,482 | 2,454
Investment Segment |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 9,207 |  |  |  | 6,867 |  |  |  | 9,207 | 6,867 |
Securities sold, not yet purchased, at fair value |  | 1,190 |  |  |  | 468 |  |  |  | 1,190 | 468 |
Portion of unrealized (losses) gains that relates to equity and debt securities still held |  |  |  |  |  |  |  |  |  | 706 | (800) | 1,413
Fair value of equity method investment under fair value option |  | 3,137 |  |  |  | 1,981 |  |  |  | 3,137 | 1,981 |
Unrealized gain on equity method investments under fair value option |  |  |  |  |  |  |  |  |  | 265 | 667 | 370
Total Assets |  | 11,283 |  |  |  | 10,750 |  |  |  | 11,283 | 10,750 |
Total liabilities |  | 2,500 |  |  |  | 649 |  |  |  | 2,500 | 649 |
Total revenues |  |  |  |  |  |  |  |  |  | (1,414) | 737 | 297
Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 9,062 |  |  |  | 6,686 |  |  |  | 9,062 | 6,686 |
Investment Segment | Debt securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 145 |  |  |  | 181 |  |  |  | 145 | 181 |
Basic materials | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 281 |  |  |  | 414 |  |  |  | 281 | 414 |
Securities sold, not yet purchased, at fair value |  | 209 |  |  |  | 0 |  |  |  | 209 | 0 |
Consumer, non-cyclical | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 2,085 |  |  |  | 2,161 |  |  |  | 2,085 | 2,161 |
Securities sold, not yet purchased, at fair value |  | 29 |  |  |  | 57 |  |  |  | 29 | 57 |
Consumer, cyclical | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 2,427 |  |  |  | 1,161 |  |  |  | 2,427 | 1,161 |
Securities sold, not yet purchased, at fair value |  | 379 |  |  |  | 106 |  |  |  | 379 | 106 |
Energy | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 1,717 |  |  |  | 1,598 |  |  |  | 1,717 | 1,598 |
Securities sold, not yet purchased, at fair value |  | 124 |  |  |  | 305 |  |  |  | 124 | 305 |
Financial | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 0 |  |  |  | 167 |  |  |  | 0 | 167 |
Securities sold, not yet purchased, at fair value |  | 152 |  |  |  | 0 |  |  |  | 152 | 0 |
Industrial | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Securities sold, not yet purchased, at fair value |  | 217 |  |  |  | 0 |  |  |  | 217 | 0 |
Technology | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 2,425 |  |  |  | 1,040 |  |  |  | 2,425 | 1,040 |
Other sectors | Investment Segment | Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments |  | 127 |  |  |  | 145 |  |  |  | 127 | 145 |
Securities sold, not yet purchased, at fair value |  | $ 80 |  |  |  | 0 |  |  |  | $ 80 | 0 |
Hertz | Investment Segment |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | [1] | 24.60% |  |  |  |  |  |  |  | 24.60% |  |
Fair value of equity method investment under fair value option |  | $ 551 |  |  |  | 320 |  |  |  | $ 551 | 320 |
Unrealized gain on equity method investments under fair value option |  |  |  |  |  |  |  |  |  | 105 | (197) | 13
Total Assets |  | 24,627 |  |  |  | 21,382 |  |  |  | 24,627 | 21,382 |
Total liabilities |  | 22,739 |  |  |  | 20,262 |  |  |  | 22,739 | 20,262 |
Equity attributable to Icahn Enterprises |  | $ 1,888 |  |  |  | 1,120 |  |  |  | 1,888 | 1,120 |
Total revenues |  |  |  |  |  |  |  |  |  | 9,779 | 9,504 | 8,803
Net income (loss) attributable to Icahn Enterprises |  |  |  |  |  |  |  |  |  | $ (58) | (225) | 327
Caesars | Investment Segment |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | [1] | 13.40% |  |  |  |  |  |  |  | 13.40% |  |
Fair value of equity method investment under fair value option |  | $ 1,243 |  |  |  | 0 |  |  |  | $ 1,243 | 0 |
Unrealized gain on equity method investments under fair value option |  |  |  |  |  |  |  |  |  | 478 | 0 | 0
Total Assets |  | 25,300 |  |  |  |  |  |  |  | 25,300 |  |
Total liabilities |  | 23,100 |  |  |  |  |  |  |  | 23,100 |  |
Equity attributable to Icahn Enterprises |  | $ 2,200 |  |  |  |  |  |  |  | 2,200 |  |
Total revenues |  |  |  |  |  |  |  |  |  | 8,700 |  |
Net income (loss) attributable to Icahn Enterprises |  |  |  |  |  |  |  |  |  | $ (1,200) |  |
Herbalife | Investment Segment |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment | [1] | 19.10% |  |  |  |  |  |  |  | 19.10% |  |
Fair value of equity method investment under fair value option |  | $ 1,343 |  |  |  | 1,661 |  |  |  | $ 1,343 | 1,661 |
Unrealized gain on equity method investments under fair value option |  |  |  |  |  |  |  |  |  | (318) | 864 | 357
Total Assets |  | 2,679 |  |  |  | 2,790 |  |  |  | 2,679 | 2,790 |
Total liabilities |  | 3,069 |  |  |  | 3,513 |  |  |  | 3,069 | 3,513 |
Equity attributable to Icahn Enterprises |  | $ (390) |  |  |  | $ (723) |  |  |  | (390) | (723) |
Total revenues |  |  |  |  |  |  |  |  |  | 4,877 | 4,892 | 4,428
Net income (loss) attributable to Icahn Enterprises |  |  |  |  |  |  |  |  |  | $ 311 | $ 297 | $ 214
[1] | Voting interest represents our share of the voting common stock currently held as of December 31, 2019; however, voting common stock held by Mr. Icahn and his affiliates (excluding us) are not included.

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