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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Data (Unaudited) [Abstract]                      
Net sales $ 4,410 [1] $ 4,292 [1] $ 4,282 [1] $ 4,319 [1] $ 3,965 [1] $ 3,904 [1] $ 4,094 [1] $ 3,548 [1] $ 17,303 $ 15,511 $ 14,604
Gross margin on net sales [1] 499 613 559 627 502 526 646 425      
Total revenues 4,733 [1] 5,680 [1] 6,654 [1] 4,677 [1] 3,972 [1] 4,899 [1] 4,350 [1] 3,127 [1] 21,744 16,348 15,272
Net income (loss) 197 [1] 829 [1] 1,725 [1] (160) [1] (564) [1] 238 [1] (285) [1] (1,609) [1] 2,591 (2,220) (2,127)
Less: net loss attributable to non-controlling interests (101) [1] 232 [1] 172 [1] (142) [1] (358) [1] 254 [1] (216) [1] (772) [1] (161) 1,092 933
Net income (loss) attributable to Icahn Enterprises $ 298 [1] $ 597 [1] $ 1,553 [1] $ (18) [1] $ (206) [1] $ (16) [1] $ (69) [1] $ (837) [1] $ 2,430 $ (1,128) $ (1,194)
Basic income (loss) per LP unit $ 1.72 [1] $ 3.53 [1] $ 9.51 [1] $ (0.12) [1] $ (1.42) [1] $ (0.12) [1] $ (0.50) [1] $ (6.21) [1] $ 14.80 $ (8.07) $ (9.29)
Diluted income (loss) per LP unit $ 1.72 [1] $ 3.53 [1] $ 9.51 [1] $ (0.12) [1] $ (1.42) [1] $ (0.12) [1] $ (0.50) [1] $ (6.21) [1] $ 14.80 $ (8.07) $ (9.29)
[1] The comparability of our quarterly financial data is affected by, among other things, (i) the performance of the Investment Funds, (ii) various acquisitions, primarily the acquisition of Pep Boys during the first quarter of 2016, (iii) certain dispositions of assets, primarily during the second and fourth quarters of 2017, (iv) impairment charges and (v) the enactment of U.S. tax law changes in the fourth quarter of 2017.