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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 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% |  | 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 | $ 5,100 |  | 5,100 |  | $ 4,400
Consolidated VIE | Expense sharing arrangement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | 2 | $ 3 | 2 | 5 |
767 Leasing (non-consolidated VIE) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
investment in related parties | 10 |  | 10 |  |
767 Leasing (non-consolidated VIE) | Receipts and revenue from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | 10 | 3 | 18 | 5 |
ACF | Payments to and purchases from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | 1 | 2 | 2 | 4 |
Insight Portfolio Group LLC | Buying group operating expenses |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | 1 | $ 1 | 2 | $ 1 |
Vehicles leased | 767 Leasing (non-consolidated VIE) | Payments to and purchases from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | 1 |  | 1 |  |
Investments | 767 Leasing (non-consolidated VIE) | Payments to and purchases from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party |  |  | 36 |  |
Vehicles for lease | 767 Leasing (non-consolidated VIE) | Payments to and purchases from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | $ 7 |  | $ 7 |  |

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