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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Mr. Icahn and affiliates | Investment in funds
Related Party Transaction [Line Items]
Amount of transaction with related party			$ 280	$ 600
Related party transaction, balance	$ 4,800		$ 4,800		$ 4,400
Percentage fair value of investments in Funds that is attributable to Mr. Icahn	62.00%		62.00%		59.00%
Consolidated VIE | Expense sharing arrangement
Related Party Transaction [Line Items]
Amount of transaction with related party	$ 4	$ 2	$ 6	7
Hertz (equity method investee) | Receipts and revenue from related party
Related Party Transaction [Line Items]
Amount of transaction with related party	11	5	29	10
ACF | Payments to and purchases from related party
Related Party Transaction [Line Items]
Amount of transaction with related party	1	1	2	4
ACF | Railcar component sales
Related Party Transaction [Line Items]
Amount of transaction with related party	3		3
Insight Portfolio Group LLC | Buying group operating expenses
Related Party Transaction [Line Items]
Amount of transaction with related party			2	2
Vehicles leased | Hertz (equity method investee) | Payments to and purchases from related party
Related Party Transaction [Line Items]
Amount of transaction with related party	0	$ 2	1	$ 2
Investments | Hertz (equity method investee) | Payments to and purchases from related party
Related Party Transaction [Line Items]
Amount of transaction with related party			36
767 Leasing | Automotive Segment
Related Party Transaction [Line Items]
Assets at non-consolidated VIE	25		25
Liabilities at non-consolidated VIE	1		1
investment in nonconsolidated VIE	15		25
investment in related parties	$ 24		$ 24

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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
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

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