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Net Income Per LP Unit (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Apr. 16, 2013
Depositary units [Member]
Feb. 11, 2013
Depositary units [Member]
Mar. 31, 2013
Depositary units [Member]
May 02, 2013
Principal Owners and Affiliates [Member]
Mar. 31, 2013
Principal Owners and Affiliates [Member]
Feb. 28, 2013
Limited partners
Depositary units [Member]
Feb. 28, 2013
General partner
Earnings Per LP Unit [Line Items]                  
Net income attributable to Icahn Enterprises $ 277 $ 49              
Net income attributable to Icahn Enterprises allocable to limited partners (98.01% allocation) 271 48              
Basic income per LP unit 2.56 0.48              
Basic weighted average LP units outstanding 106,000,000 99,000,000              
Dilutive effect of variable rate convertible notes (income) 2                
Dilutive effect of variable rate convertible notes (units) 2,000,000                
Dilutive effect of unit distribution declared (income) 0                
Dilutive effect of unit distribution declared (units) 1,000,000                
Diluted income per LP unit 2.50 0.48              
Diluted weighted average LP units outstanding 109,000,000 99,000,000              
Amount of antidilutive securities excluded from computation of earnings per share   5,000,000              
Units issues in connection with equity offering (ones)               3,174,604  
Equity offering per share amount (ones)               $ 63.00  
Proceeds from equity offering 556 0           194  
Proceeds from equity offerings 198 510             4
Underwriter option to purchase additional depositary units               476,191  
Distribution declared per depositary unit       $ 1.00          
Units distributed as part of quartelry distribution     1,521,946            
Affiliate ownership interest in Icahn Enterprises           90.60% 90.50%    
Distribution payable         $ 105