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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Mr. Icahn and affiliates | Investment in funds |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party |  |  | $ 70 | $ 280 |
Related party transaction, balance | $ 4,700 |  | $ 4,700 |  | $ 5,000
Percentage fair value of investments in Funds that is attributable to Mr. Icahn | 50.00% |  | 50.00% |  | 50.00%
Consolidated VIE | Expense sharing arrangement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | $ 2 | $ 2 | $ 5 | 2 |
Hertz (equity method investee) | Receipts and revenue from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | 13 | 12 | 25 | 18 |
Hertz (equity method investee) | Payments to and purchases from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party |  |  | 1 | 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 | 0 | 1 | 1 | 2 |
767 Leasing | Automotive Segment |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Assets at non-consolidated VIE | 105 |  | 105 |  | $ 60
Liabilities at non-consolidated VIE | 0 |  | 0 |  | 1
Investment in non-consolidated VIE during the period | 20 | $ 5 | 45 | 10 |
Investment balance in non-consolidated VIE as of end of period period | $ 107 |  | $ 107 |  | $ 59
Investment [Member] | Hertz (equity method investee) | Payments to and purchases from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party |  |  |  | $ 36 |

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