Related Party Transactions (Details) (USD $)					12 Months Ended																12 Months Ended	8 Months Ended	3 Months Ended			12 Months Ended			12 Months Ended										12 Months Ended				0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member]	Dec. 31, 2011 Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member]	Dec. 31, 2012 Principal Owners and Affiliates [Member] Non-exclusive use of office space expense [Member]	Dec. 31, 2011 Principal Owners and Affiliates [Member] Non-exclusive use of office space expense [Member]	Dec. 31, 2010 Principal Owners and Affiliates [Member] Non-exclusive use of office space expense [Member]	Dec. 31, 2012 ARL [Member]	Dec. 31, 2012 XO Holdings [Member] Telecommunication Services [Member]	Dec. 31, 2011 XO Holdings [Member] Telecommunication Services [Member]	Dec. 31, 2010 XO Holdings [Member] Telecommunication Services [Member]	Dec. 31, 2012 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, 2012 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, 2012 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]	Dec. 31, 2012 CVR Energy, Inc. [Member]	Dec. 31, 2012 CVR Partners, LP [Member] ARL [Member] Railcar lease expense [Member]	Jun. 30, 2012 Investment Funds [Member] Principal Owners and Affiliates [Member]	Dec. 31, 2012 Investment Funds [Member] Principal Owners and Affiliates [Member]	Dec. 31, 2011 Investment Funds [Member] Principal Owners and Affiliates [Member]	Dec. 31, 2012 ARI [Member]	Dec. 31, 2012 ARI [Member] ARL [Member]	Dec. 31, 2011 ARI [Member] ARL [Member]	Dec. 31, 2012 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, 2012 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, 2012 ARI and AEP Leasing [Member] ARL [Member] Railcar Managment Fees [Member]	Dec. 31, 2011 ARI and AEP Leasing [Member] ARL [Member] Railcar Managment Fees [Member]	Dec. 31, 2012 Icahn Enterprises Holdings [Member]	Dec. 31, 2011 Icahn Enterprises Holdings [Member]	Dec. 31, 2012 Icahn Enterprises Holdings [Member] Principal Owners and Affiliates [Member] Professional Fees [Member]	Dec. 31, 2011 Icahn Enterprises Holdings [Member] Principal Owners and Affiliates [Member] Professional Fees [Member]	Dec. 31, 2010 Icahn Enterprises Holdings [Member] Principal Owners and Affiliates [Member] Professional Fees [Member]	Dec. 31, 2012 Principal Owners and Affiliates [Member]	May 07, 2012 Principal Owners and Affiliates [Member] IEP Energy [Member]
Related Party Transaction [Line Items]
Expenses charged by related party					$ 3,000,000	$ 2,000,000	$ 2,000,000		$ 1,000,000	$ 1,000,000	$ 1,000,000	$ 2,000,000	$ 1,000,000	$ 2,000,000	$ 4,000,000	$ 2,000,000	$ 3,000,000	$ 23,000,000	$ 21,000,000			$ 700,000																	$ 3,000,000	$ 3,000,000	$ 2,000,000
Liability balances due to related party			1,000,000	0
Investments, fair value																								3,500,000,000	3,200,000,000
Settlement of deferred management fee																							192,000,000
Deferred management fee																									188,000,000
Capital contributions by non-controlling interests in subsidiary (Shares)																				4,566,546
Capital contributions by non-controlling interests in subsidiary																				137,000,000
Affiliate ownership interest																																										93.20%	6.40%
Percentage of equity ownership in subsidiary																					82.00%					55.60%											99.00%
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																													21,000,000	25,000,000	15,000,000
Revenue from Related Parties																																45,000,000	1,000,000	82,000,000
Related Party Transaction, Expenses from Transactions with Related Party																																			1,600,000	300,000
Accounts receivable due from related parties																											2,000,000	4,000,000
Accrued expenses and other liabilities	$ 1,496,000,000	$ 1,317,000,000																																			$ 1,496,000,000	$ 1,317,000,000	$ 1,000,000	$ 1,000,000