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Net Income Per LP Unit (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Nov. 02, 2016 | Nov. 01, 2016 | Sep. 19, 2016 | Aug. 03, 2016 | Jun. 16, 2016 | Apr. 29, 2016 | Apr. 12, 2016 | Feb. 29, 2016 | Feb. 23, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises |  |  |  |  |  |  |  |  |  | $ (16) | $ (440) | $ (922) | $ (67)
Net (loss) income attributable to Icahn Enterprises allocable to limited partners (98.01% allocation) |  |  |  |  |  |  |  |  |  | $ (16) | $ (432) | $ (904) | $ (66)
Basic (loss) income per LP unit |  |  |  |  |  |  |  |  |  | $ (0.12) | $ (3.40) | $ (6.70) | $ (0.53)
Basic weighted average LP units outstanding |  |  |  |  |  |  |  |  |  | 139,000,000 | 127,000,000 | 135,000,000 | 125,000,000
Diluted (loss) income per LP unit |  |  |  |  |  |  |  |  |  | $ (0.12) | $ (3.40) | $ (6.70) | $ (0.53)
Diluted weighted average LP units outstanding |  |  |  |  |  |  |  |  |  | 139,000,000 | 127,000,000 | 135,000,000 | 125,000,000
Distribution made to limited partners, Unit distribution |  |  | 3,586,029 |  | 3,116,976 |  | 2,824,186 |  |  |  |  |  |
Distribution declared per depositary unit |  |  |  | $ 1.50 |  | $ 1.50 |  |  | $ 1.50 |  |  |  |
Mr. Icahn and his affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises |  |  |  |  |  |  |  |  |  |  |  | 89.70% |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution declared per depositary unit |  | $ 1.50 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Mr. Icahn and his affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises | 89.70% |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises |  |  |  |  |  |  |  |  |  | $ 18 | $ 35 | $ 98 | $ 98
ARL [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
LP units issued as consideration for acquisition |  |  |  |  |  |  |  | 685,367 |  |  |  |  |

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