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Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified					6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended				3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member]	Dec. 31, 2011 Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member]	Jun. 30, 2012 ARL [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]	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]	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]	May 07, 2012 IEP Energy [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]	Jun. 30, 2012 ARI [Member] ARL [Member]	Dec. 31, 2011 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]	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]	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]	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]	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]	Jun. 30, 2012 Principal Owners and Affiliates [Member]	Dec. 31, 2011 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]
Expenses charged by related party						$ 0.4	$ 0.2	$ 0.9	$ 0.4	$ 0.3	$ 0.3	$ 1.0	$ 1.0	$ 7.0	$ 4.0	$ 11.0	$ 4.0														$ 1.0	$ 1.0	$ 1.0	$ 1.0	$ 0.4	$ 0.6	$ 0.8	$ 1.2		$ 0	$ 0	$ 0.2	$ 0.1	$ 0.4	$ 0.3
Capital contributions by non-controlling interests in subsidiary (Shares)																		4,566,546
Capital contributions by non-controlling interests in subsidiary																		137
Affiliate ownership interest																																														93.00%	92.60%	6.40%	6.40%
Liability balances due to related party			0.1	0
Investments, fair value																			3,500	3,200
Settlement of deferred management fee																			192
Deferred Management Fee																				188
Term of service agreement (in years)					3 years
Renewal period of service agreement (in years)					1 year
Written notice requirment period to terminate services agreement (in days)					60 days
Related Party Transaction, Other Revenues from Transactions with Related Party																							6	7	11	12
Revenue from Related Parties																											11	0	11	1
Accounts receivable due from related parties																					9	4
Accrued expenses and other liabilities	$ 1,554.0	$ 1,317.0																																	$ 0.1		$ 0.1		$ 1.0