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Schedule I - Condensed Financial Information of Parent Condensed Financial Information of Parent Company (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Senior unsecured notes [Member]
Variable Rate Senior Unsecured Convertible Notes [Member]
Dec. 31, 2011
Senior unsecured notes [Member]
Variable Rate Senior Unsecured Convertible Notes [Member]
Dec. 31, 2010
Senior unsecured notes [Member]
Variable Rate Senior Unsecured Convertible Notes [Member]
Jun. 30, 2012
Senior unsecured notes [Member]
8% senior unsecured notes due 2018 [Member]
Dec. 31, 2011
Senior unsecured notes [Member]
8% senior unsecured notes due 2018 [Member]
Dec. 31, 2010
Senior unsecured notes [Member]
8% senior unsecured notes due 2018 [Member]
Jun. 30, 2012
Senior unsecured notes [Member]
7.75% senior unsecured notes due 2016 [Member]
Dec. 31, 2011
Senior unsecured notes [Member]
7.75% senior unsecured notes due 2016 [Member]
Dec. 31, 2010
Senior unsecured notes [Member]
7.75% senior unsecured notes due 2016 [Member]
Dec. 31, 2011
Parent Company [Member]
Dec. 31, 2010
Parent Company [Member]
Dec. 31, 2011
Parent Company [Member]
Senior unsecured notes [Member]
Dec. 31, 2010
Parent Company [Member]
Senior unsecured notes [Member]
Dec. 31, 2011
Parent Company [Member]
Senior unsecured notes [Member]
Variable Rate Senior Unsecured Convertible Notes [Member]
Dec. 31, 2010
Parent Company [Member]
Senior unsecured notes [Member]
Variable Rate Senior Unsecured Convertible Notes [Member]
Dec. 31, 2011
Parent Company [Member]
Senior unsecured notes [Member]
8% senior unsecured notes due 2018 [Member]
Dec. 31, 2010
Parent Company [Member]
Senior unsecured notes [Member]
8% senior unsecured notes due 2018 [Member]
Dec. 31, 2011
Parent Company [Member]
Senior unsecured notes [Member]
7.75% senior unsecured notes due 2016 [Member]
Dec. 31, 2010
Parent Company [Member]
Senior unsecured notes [Member]
7.75% senior unsecured notes due 2016 [Member]
Dec. 31, 2011
Parent Company [Member]
Senior unsecured notes [Member]
Mortgages [Member]
Dec. 31, 2010
Parent Company [Member]
Senior unsecured notes [Member]
Mortgages [Member]
Parent company ownership interest in Icahn Enterprises Holdings                         99.00%                      
Debt $ 8,196 $ 6,463 $ 6,498 $ 556 [1] $ 556 [1] $ 556 [1] $ 2,158 [1] $ 1,444 [1] $ 1,444 [1] $ 1,047 [1] $ 1,046 [1] $ 1,045 [1] $ 3,112 $ 3,115 $ 3,112 $ 3,115 $ 556 $ 556 $ 1,444 $ 1,444 $ 1,046 $ 1,045 $ 66 $ 70
[1] Proceeds from the issuance of each of Icahn Enterprises' notes were transferred to Icahn Enterprises Holdings under identical terms and conditions.