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Net Income Per LP Unit (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2016 | Jun. 16, 2016 | Apr. 29, 2016 | Apr. 12, 2016 | Feb. 29, 2016 | Feb. 23, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises |  |  |  |  |  |  | $ (69) | $ 212 | $ (906) | $ 373
Net (loss) income attributable to Icahn Enterprises allocable to limited partners (98.01% allocation) |  |  |  |  |  |  | $ (68) | $ 208 | $ (888) | $ 366
Basic (loss) income per LP unit |  |  |  |  |  |  | $ (0.50) | $ 1.68 | $ (6.68) | $ 2.95
Basic weighted average LP units outstanding |  |  |  |  |  |  | 135,000,000 | 124,000,000 | 133,000,000 | 124,000,000
Diluted (loss) income per LP unit |  |  |  |  |  |  | $ (0.50) | $ 1.68 | $ (6.68) | $ 2.95
Diluted weighted average LP units outstanding |  |  |  |  |  |  | 135,000,000 | 124,000,000 | 133,000,000 | 124,000,000
Distribution declared per depositary unit |  |  | $ 1.50 |  |  | $ 1.50 |  |  |  |
Depositary units [Member] |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Distribution made to limited partners, Unit distribution |  | 3,116,976 |  | 2,824,186 |  |  |  |  |  |
Mr. Icahn and his affiliates [Member] |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises |  |  |  |  |  |  |  |  | 89.50% |
Ownership percentage [Member] | Mr. Icahn and his affiliates [Member] |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises | 89.50% |  |  |  |  |  |  |  |  |
Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises |  |  |  |  |  |  | $ 44 | $ 36 | $ 80 | $ 63
ARL [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |
LP units issued as consideration for acquisition |  |  |  |  | 685,367 |  |  |  |  |

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