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Related Party Transactions (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 29, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mr. Icahn and affiliates
Related Party Transaction [Line Items]
Percentage fair value of investments in Funds that is attributable to Mr. Icahn		59.00%	69.00%
ARL
Related Party Transaction [Line Items]
Equity issued to acquire additional interest in consolidated subsidiary (number of units)	685,367
Percentage of equity ownership in subsidiary			100.00%
Investment in funds | Mr. Icahn and affiliates
Related Party Transaction [Line Items]
Amount of transaction with related party		$ 600	$ 498	$ 240
Investment balance in funds | Mr. Icahn and affiliates
Related Party Transaction [Line Items]
Related party transaction, balance		4,400	3,700
Expense sharing arrangement | Consolidated VIE
Related Party Transaction [Line Items]
Amount of transaction with related party		13	34	235
Repair services revenue from related party | Hertz
Related Party Transaction [Line Items]
Amount of transaction with related party		17	3
Purchases from related party | Hertz
Related Party Transaction [Line Items]
Amount of transaction with related party		2	2
Purchases from related party | ACF
Related Party Transaction [Line Items]
Amount of transaction with related party		6	21	86
Distribution of cash | IRL Holding
Related Party Transaction [Line Items]
Amount of transaction with related party				25
Withholdings | IRL Holding
Related Party Transaction [Line Items]
Amount of transaction with related party				2
Sales to related party | ACF
Related Party Transaction [Line Items]
Amount of transaction with related party		1	1	10
Buying group operating expenses | Insight Portfolio Group LLC
Related Party Transaction [Line Items]
Amount of transaction with related party		$ 2	$ 2	$ 2

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

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