Related Party Transactions (Details) (USD $)	9 Months Ended		3 Months Ended		9 Months Ended				9 Months Ended	12 Months Ended			9 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			9 Months Ended	0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member]	Sep. 30, 2013 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member]	Sep. 30, 2014 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member]	Sep. 30, 2013 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member]	Sep. 30, 2014 Federal-Mogul [Member]	Dec. 06, 2013 Federal-Mogul [Member] Principal Owners and Affiliates [Member]	Sep. 30, 2014 Investment Funds [Member] Principal Owners and Affiliates [Member]	Dec. 31, 2013 Investment Funds [Member] Principal Owners and Affiliates [Member]	Sep. 30, 2014 Investment Funds [Member] Principal Owners and Affiliates [Member] Investment in Funds [Member]	Dec. 31, 2013 Investment Funds [Member] Principal Owners and Affiliates [Member] Investment in Funds [Member]	Sep. 30, 2014 ARI [Member]	Sep. 30, 2014 ARI [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2013 ARI [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2014 ARI [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2013 ARI [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2014 AEP Leasing [Member] ACF [Member]	Sep. 30, 2014 AEP Leasing [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2013 AEP Leasing [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2014 AEP Leasing [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2013 AEP Leasing [Member] ACF [Member] Railcar Sales [Member]	Sep. 30, 2014 AEP Leasing [Member] ACF [Member] Purchase of railcars [Member]	Sep. 30, 2014 Investment Segment [Member] Principal Owners and Affiliates [Member]	Oct. 02, 2013 Railcar Segment [Member] New ARL [Member] [Member]
Related Party Transaction [Line Items]
Investment segment contributions	$ 500,000,000	$ 45,000,000																						$ (500,000,000)
Related party transaction, balance											5,400,000,000	4,700,000,000
Percentage fair value of investments in Funds that is attributable to Mr. Icahn									53.00%	56.00%
Expenses charged by related party			36,000,000	40,000,000	138,000,000	79,000,000
Funding Commitment, Total Amount								1,600,000,000
Related Party Transaction, Other Revenues from Transactions with Related Party														4,000,000	3,000,000	16,000,000	7,000,000
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required																							1,050
Related Party Transaction, Expenses from Transactions with Related Party																			36,000,000	20,000,000	99,000,000	25,000,000
Unrecorded Unconditional Purchase Obligation																							150,000,000
Option to purchase additinal railcars, number of cars																		500
Option to purchase additional railcars																		70,000,000
Railcars purchased																		296
Purchase price of railcars																		$ 43,000,000
Percentage of equity ownership in subsidiary							80.70%						55.60%												75.00%