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Net Income Per LP Unit (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 02, 2019 | Jan. 31, 2017 | 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 | Dec. 31, 2016
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises from continuing operations |  |  |  |  |  |  |  |  |  |  | $ (1,066) | $ (238) | $ 2,297 |
Net (loss) income attributable to Icahn Enterprises from discontinued operations |  |  |  |  |  |  |  |  |  |  | (32) | 1,720 | 157 |
Less: net loss attributable to Icahn Enterprises from discontinued operations allocated 100% to general partner |  |  |  |  |  |  |  |  |  |  | 0 | 598 | 0 |
Net (loss) income attributable to Icahn Enterprises from discontinued operations allocable to limited partners |  |  |  |  |  |  |  |  |  |  | $ (32) | $ 2,318 | $ 157 |
Basic income (loss) per LP unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  |  | $ (0.70) | $ (0.24) | $ (2.37) | $ (2.02) | $ (2.30) | $ (0.24) | $ 0.81 | $ 0.55 | $ (5.23) | $ (1.29) | $ 13.98 |
Discontinued operations |  |  | (0.04) | 0.00 | (0.12) | 0.00 | 10.31 | 0.88 | 0.85 | 0.19 | (0.15) | 12.62 | 0.96 |
Basic income (loss) per LP unit |  |  | (0.74) | (0.24) | (2.49) | (2.02) | 8.01 | 0.64 | 1.66 | 0.74 | $ (5.38) | $ 11.33 | $ 14.94 |
Basic weighted average LP units outstanding |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 180,000,000 | 161,000,000 |
Diluted income (loss) per LP unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  |  | (0.70) | (0.24) | (2.37) | (2.02) | (2.30) | (0.24) | 0.81 | 0.55 | $ (5.23) | $ (1.29) | $ 13.98 |
Discontinued operations |  |  | (0.04) | 0.00 | (0.12) | 0.00 | 10.31 | 0.88 | 0.85 | 0.19 | (0.15) | 12.62 | 0.96 |
Diluted income (loss) per LP unit |  |  | $ (0.74) | $ (0.24) | $ (2.49) | $ (2.02) | $ 8.01 | $ 0.64 | $ 1.66 | $ 0.74 | $ (5.38) | $ 11.33 | $ 14.94 |
Diluted weighted average LP units outstanding |  |  |  |  |  |  |  |  |  |  | 200,000,000 | 180,000,000 | 161,000,000 |
Limited partners: Depositary units issued |  |  | 214,078,558 |  |  |  | 191,366,097 |  |  |  | 214,078,558 | 191,366,097 | 173,564,307 | 144,741,149
Units distributed to LP unitholders |  |  |  |  |  |  |  |  |  |  | 21,898,853 | 17,778,950 | 17,644,152 |
2017 LTIP units vested |  |  |  |  |  |  |  |  |  |  | 19,259 | 22,840 | 7,902 |
Partners' Capital Account, Units, Sale of Units |  |  |  |  |  |  |  |  |  |  | 794,349 |  | 11,171,104 |
Potential aggregate sales proceeds from equity offering | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Interest in Partnership Unit |  |  |  |  |  |  |  |  |  |  | $ 54 |  |  |
Mr. Icahn and affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted income (loss) per LP unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners: Depositary units issued |  |  | 197,049,652 |  |  |  | 175,441,588 |  |  |  | 197,049,652 | 175,441,588 | 157,898,582 | 129,999,050
Units distributed to LP unitholders |  |  |  |  |  |  |  |  |  |  | 21,608,064 | 17,543,006 | 17,374,427 |
2017 LTIP units vested |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Partners' Capital Account, Units, Sale of Units |  |  |  |  |  |  |  |  |  |  | 0 |  | 10,525,105 |
Public unitholders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted income (loss) per LP unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partners: Depositary units issued |  |  | 17,028,906 |  |  |  | 15,924,509 |  |  |  | 17,028,906 | 15,924,509 | 15,665,725 | 14,742,099
Units distributed to LP unitholders |  |  |  |  |  |  |  |  |  |  | 290,789 | 235,944 | 269,725 |
2017 LTIP units vested |  |  |  |  |  |  |  |  |  |  | 19,259 | 22,840 | 7,902 |
Partners' Capital Account, Units, Sale of Units |  |  |  |  |  |  |  |  |  |  | 794,349 |  | 645,999 |
General partner |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted income (loss) per LP unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary units issued (value) |  | $ 12 |  |  |  |  |  |  |  |  |  |  |  |
Limited partners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted income (loss) per LP unit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depositary units issued (value) |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |
Limited partners |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises from continuing operations |  |  |  |  |  |  |  |  |  |  | $ (1,045) | $ (233) | $ 2,251 |
Net (loss) income attributable to Icahn Enterprises from discontinued operations |  |  |  |  |  |  |  |  |  |  | $ (31) | $ 2,272 | $ 154 |

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