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Related Party Transactions (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2012
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Dec. 31, 2011
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Dec. 31, 2010
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2012
ARL [Member]
Dec. 31, 2011
ARL [Member]
Dec. 31, 2010
Icahn Fund Ltd. [Member]
Icahn Management [Member]
Jun. 30, 2012
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2011
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2012
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2011
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Dec. 31, 2011
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Dec. 31, 2010
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Dec. 31, 2009
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2012
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Investment-Related Expenses [Member]
Jun. 30, 2011
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Investment-Related Expenses [Member]
Jun. 30, 2012
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Investment-Related Expenses [Member]
Jun. 30, 2011
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Investment-Related Expenses [Member]
Dec. 31, 2011
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Investment-Related Expenses [Member]
Dec. 31, 2010
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Investment-Related Expenses [Member]
Dec. 31, 2009
Icahn Capital [Member]
Principal Owners and Affiliates [Member]
Investment-Related Expenses [Member]
Jun. 30, 2012
Icahn Capital [Member]
Investment Funds [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2011
Icahn Capital [Member]
Investment Funds [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2012
Icahn Capital [Member]
Investment Funds [Member]
Expense Sharing Agreement [Member]
Jun. 30, 2011
Icahn Capital [Member]
Investment Funds [Member]
Expense Sharing Agreement [Member]
Dec. 31, 2011
Icahn Capital [Member]
Investment Funds [Member]
Expense Sharing Agreement [Member]
May 07, 2012
IEP Energy [Member]
Principal Owners and Affiliates [Member]
Apr. 02, 2011
Investment Funds [Member]
Principal Owners and Affiliates [Member]
Jun. 30, 2012
Investment Funds [Member]
Principal Owners and Affiliates [Member]
Dec. 31, 2011
Investment Funds [Member]
Principal Owners and Affiliates [Member]
Dec. 31, 2010
Investment Funds [Member]
Principal Owners and Affiliates [Member]
Jun. 30, 2012
ARI [Member]
ARL [Member]
Dec. 31, 2011
ARI [Member]
ARL [Member]
Dec. 31, 2010
ARI [Member]
ARL [Member]
Jun. 30, 2012
ARI [Member]
ARL [Member]
Railcar Services [Member]
Jun. 30, 2011
ARI [Member]
ARL [Member]
Railcar Services [Member]
Jun. 30, 2012
ARI [Member]
ARL [Member]
Railcar Services [Member]
Jun. 30, 2011
ARI [Member]
ARL [Member]
Railcar Services [Member]
Dec. 31, 2011
ARI [Member]
ARL [Member]
Railcar Services [Member]
Dec. 31, 2010
ARI [Member]
ARL [Member]
Railcar Services [Member]
Dec. 31, 2009
ARI [Member]
ARL [Member]
Railcar Services [Member]
Jun. 30, 2012
ARI [Member]
ARL [Member]
Railcars Sales [Member]
Jun. 30, 2011
ARI [Member]
ARL [Member]
Railcars Sales [Member]
Jun. 30, 2012
ARI [Member]
ARL [Member]
Railcars Sales [Member]
Jun. 30, 2011
ARI [Member]
ARL [Member]
Railcars Sales [Member]
Dec. 31, 2011
ARI [Member]
ARL [Member]
Railcars Sales [Member]
Dec. 31, 2010
ARI [Member]
ARL [Member]
Railcars Sales [Member]
Dec. 31, 2009
ARI [Member]
ARL [Member]
Railcars Sales [Member]
Dec. 31, 2011
Icahn Enterprises Holdings [Member]
Jun. 30, 2012
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Non-exclusive use of office space expense [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Non-exclusive use of office space expense [Member]
Jun. 30, 2012
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Non-exclusive use of office space expense [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Non-exclusive use of office space expense [Member]
Dec. 31, 2011
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Non-exclusive use of office space expense [Member]
Dec. 31, 2010
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Non-exclusive use of office space expense [Member]
Dec. 31, 2009
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Non-exclusive use of office space expense [Member]
Jun. 30, 2012
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Professional Services [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Professional Services [Member]
Jun. 30, 2012
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Professional Services [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Professional Services [Member]
Dec. 31, 2011
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Professional Services [Member]
Dec. 31, 2010
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Professional Services [Member]
Dec. 31, 2009
Icahn Enterprises Holdings [Member]
Principal Owners and Affiliates [Member]
Professional Services [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
Other Affiliates [Member]
Non-exclusive use of office space expense [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
Other Affiliates [Member]
Non-exclusive use of office space expense [Member]
Jun. 30, 2012
Icahn Enterprises Holdings [Member]
XO Holdings [Member]
Telecommunication Services [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
XO Holdings [Member]
Telecommunication Services [Member]
Jun. 30, 2012
Icahn Enterprises Holdings [Member]
XO Holdings [Member]
Telecommunication Services [Member]
Jun. 30, 2011
Icahn Enterprises Holdings [Member]
XO Holdings [Member]
Telecommunication Services [Member]
Dec. 31, 2011
Icahn Enterprises Holdings [Member]
XO Holdings [Member]
Telecommunication Services [Member]
Dec. 31, 2010
Icahn Enterprises Holdings [Member]
XO Holdings [Member]
Telecommunication Services [Member]
Dec. 31, 2009
Icahn Enterprises Holdings [Member]
XO Holdings [Member]
Telecommunication Services [Member]
Jun. 30, 2012
Principal Owners and Affiliates [Member]
Dec. 31, 2011
Principal Owners and Affiliates [Member]
Dec. 31, 2010
Principal Owners and Affiliates [Member]
May 07, 2012
Principal Owners and Affiliates [Member]
IEP Energy [Member]
Jun. 30, 2012
Principal Owners and Affiliates [Member]
IEP Energy [Member]
Related Party Transaction [Line Items]                                                                                                                                                              
Deferred Management Fee                 $ 143                                             $ 188 $ 148                                                                                            
Expenses charged by related party                   0.4 0.2 0.9 0.4 1.0 2.0 4.0 0.3 0.3 1.0 1.0 2.0 3.0 2.0 7.0 4.0 11.0 4.0 21.0                                               1.0 1.0 1.0 1.0 2.0 2.0 2.0 0.4 0.6 0.8 1.2 3.0 2.0 2.0 0 0 0.2 0.1 0.4 0.3 1.0 1.0 1.0          
Liability balances due to related party       0.1 0 2.0                                                                                                                                                  
Investment in funds                                                           250                                                                                                  
Investments, fair value                                                             3,500 3,200 2,100                                                                                            
Capital contributions by non-controlling interests in subsidiary (Shares)                                                         4,566,546                                                                                                    
Capital contributions by non-controlling interests in subsidiary                                                         137                                                                                                    
Affiliate ownership interest                                                                                                     99.00%                                               93.00% 92.60% 92.60% 6.40% 6.40%
Settlement of deferred management fee                                                             192                                                                                                
Term of service agreement (in years)             3 years 3 years                                                                                                                                              
Renewal period of service agreement (in years)             1 year 1 year                                                                                                                                              
Written notice requirment period to terminate services agreement (in days)             60 days 60 days                                                                                                                                              
Related Party Transaction, Other Revenues from Transactions with Related Party                                                                         6 7 11 12 25 15 14                                                                        
Revenue from Related Parties                                                                                       11 0 11 1 1 82 105                                                          
Accounts receivable due from related parties                                                                   9 4 2                                                                                      
Accrued expenses and other liabilities $ 1,554.0 $ 1,317.0 $ 2,277.0                                                                                                               $ 0.1   $ 0.1   $ 1.0