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Related Party Transactions (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 05, 2022 item | Oct. 01, 2020 | Jul. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Jan. 31, 2023 USD ($)
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Number of portfolios | item | 2 |  |  |  |  |  |  |  |  |  |
Mr. Icahn and affiliates |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Variable Interest Entity |  |  |  | $ 1,500 |  |  |  | $ 1,500 |  | $ 2,100 |
Percentage of assets under management |  |  |  | 35.00% |  |  |  | 35.00% |  | 39.00% |
Auto Plus |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Repayment of notes receivable |  |  |  |  |  |  |  | $ 7 |  |  |
Brett Icahn |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Portfolio manager term | 7 years | 7 years |  |  |  |  |  |  |  |  |
Number of lump sum payment after term | item | 1 |  |  |  |  |  |  |  |  |  |
Investment in funds |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Investment funds |  |  | $ 650 |  |  |  |  |  |  |  |
Investment in funds | Mr. Icahn and affiliates |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Investment funds |  |  | 256 |  |  |  |  |  |  |  |
Amount redeemed in accordance with manager agreement |  |  |  |  |  |  |  | 250 | $ 2,000 |  |
Investment in funds | Holding Company |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Investment funds |  |  | $ 394 |  |  |  |  |  |  |  |
Expense sharing arrangement | Consolidated VIE |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Amount of transaction with related party |  |  |  |  |  |  |  | 14 | 10 |  |
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 |  |  |  |  |  |  |  |  |  |  |
Revenues from operating leases |  |  |  | $ 15 | $ 14 |  |  | 45 | 43 |  |
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 |  |  |  | $ 2 | $ 3 |  |  | 7 | 15 |  |
Real Estate Segment | Deconsolidation of Investment in Auto Plus | Auto Plus |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Revenues from operating leases |  |  |  |  |  | $ 3 |  |  |  |  |
Brett Icahn |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Amount redeemed in accordance with manager agreement |  |  |  |  |  |  |  | 4 | $ 9 |  |
Investment funds total fair value |  |  |  |  |  |  |  | $ 17 |  | $ 28 |

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