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Related Party Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Mr. Icahn and affiliates | Investment in funds |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party |  |  |  | $ 1,241 |
Related party transaction, balance | $ 5,600 |  | $ 5,600 |  | $ 5,000
Percentage fair value of investments in Funds that is attributable to Mr. Icahn | 54.00% |  | 54.00% |  | 54.00%
Consolidated VIE | Expense sharing arrangement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party | $ 4 | $ 3 | $ 8 | (3) |
Reduction in amount of transaction with related party |  |  |  | 8 |
Hertz (equity method investee) | Receipts and revenue from related party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount of transaction with related party |  | $ 6 |  | $ 20 |
767 Leasing | Automotive Segment |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Investment in non-consolidated VIE during the period | 5 |  | 16 |  |
Investment balance in non-consolidated VIE as of end of period period | 19 |  | 19 |  | $ 40
Brett Icahn |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Amount contributed in accordance with manager agreement |  |  | 46 |  |
Investment funds total fair value | $ 65 |  | $ 65 |  |

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