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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Mr. Icahn and affiliates |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn | 60.00% |  | 59.00%
Mr. Icahn and affiliates | Investment in funds |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction with related party | $ 280 | $ 600 |
Mr. Icahn and affiliates | Investment balance in funds |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, balance | 4,900 |  | $ 4,400
Consolidated VIE | Expense sharing arrangement |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction with related party | 1 | 2 |
Hertz | Receipts and revenue from related party |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction with related party | 6 |  |
Hertz | Payments to and purchases from related party |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction with related party | 1 |  |
ACF | Payments to and purchases from related party |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction with related party | 1 | 2 |
Insight Portfolio Group LLC | Buying group operating expenses |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction with related party | $ 2 | $ 1 |

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- Definition Amount of transactions with related party during the financial reporting period. + References 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 + Details
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