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Related Party Transactions (Details) $ in Millions |  |  |  | 1 Months Ended | 11 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | May 05, 2022 item | Oct. 01, 2020 shares | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Feb. 06, 2023 USD ($) | Jan. 31, 2023 USD ($)
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Number of portfolios | item |  | 2 |  |  |  |  |  |  |  |
Incentive Plan 2017 [Member] | Restricted Depositary Units [Member] |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Grants of restricted depository units | shares |  |  | 239,254 |  |  |  |  |  |  |
Vesting period |  |  | 7 years |  |  |  |  |  |  |
Mr. Icahn and affiliates |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Percentage of assets under management | 39.00% |  |  | 39.00% | 39.00% | 39.00% | 54.00% |  |  |
Noncontrolling Interest in Variable Interest Entity | $ 2,100 |  |  | $ 2,100 | $ 2,100 | $ 2,100 | $ 4,900 |  |  |
Investment funds |  |  |  | $ 158 |  |  |  |  |  |
Brett Icahn |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Portfolio manager term |  | 7 years | 7 years |  |  |  |  |  |  |
Number of lump sum payment after term | item |  | 1 |  |  |  |  |  |  |  |
Auto Plus |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Repayment of notes receivable |  |  |  |  |  | 11 |  |  |  |
Write-off of notes receivable |  |  |  |  |  | 127 |  |  |  |
ProceedsFromSaleAndCollectionOfNotesReceivable | $ 48 |  |  |  |  |  |  |  |  |
Investment in funds | Mr. Icahn and affiliates |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Redemption of investment funds |  |  |  |  |  | 2 | 0 |  |  |
Expense sharing arrangement | Consolidated VIE |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Amount of transaction with related party |  |  |  |  |  | 18 | 18 | $ 15 |  |
Debtor in Possession Financing | Auto Plus |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  |  |  |  |  |  |  | $ 75
Auto Plus Auction | AEP PLC |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Assets acquired |  |  |  |  |  | 10 |  |  |  |
Automotive Segment |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
DIP loan amount |  |  |  |  |  |  |  |  | $ 17 |
Revenues from operating leases |  |  |  |  |  | 56 | 45 | 10 |  |
Automotive Segment | Deconsolidation of Investment in Auto Plus | Auto Plus |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Revenues from operating leases |  |  |  |  | 3 |  |  |  |  |
Purchases from related party |  |  |  |  | $ 4 |  |  |  |  |
Real Estate Segment |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Revenues from operating leases |  |  |  |  |  | 17 | 7 | $ 8 |  |
Brett Icahn |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |
Amount redeemed in accordance with manager agreement |  |  |  |  |  | 17 | 14 |  |  |
Investment funds total fair value |  |  |  |  |  | $ 28 | $ 50 |  |  |

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