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Related Party Transactions (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 05, 2022 item | Oct. 01, 2020 | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Aug. 31, 2025 USD ($)
Related Party Transaction |  |  |  |  |  |  |  |
Number of portfolios | item | 2 |  |  |  |  |  |  |
Related party notes receivable, net |  |  | $ 124 |  | $ 124 |  | $ 7 |
Mr. Icahn and affiliates |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Noncontrolling Interest in Variable Interest Entity |  |  | $ 800 |  | $ 800 |  | $ 1,500 |
Percentage of assets under management |  |  | 25.00% |  | 25.00% |  | 35.00% |
Brett Icahn |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Portfolio manager term | 7 years | 7 years |  |  |  |  |  |
Number of lump sum payment after term | item | 1 |  |  |  |  |  |  |
TEB LLC |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Related party notes receivable, net |  |  |  |  |  |  |  | $ 124
Investment in funds | Mr. Icahn and affiliates |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Redemption of investment funds |  |  | $ 300 | $ 250 | $ 508 | $ 250 |  |
Expense sharing arrangement | Consolidated VIE |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Amount of transaction with related party |  |  |  |  | 11 |  | $ 14 |
Real Estate Segment |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Related party notes receivable, net |  |  | $ 124 |  | 124 |  |  |
Real Estate Segment | TEB LLC |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | $ 247
Brett Icahn |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |
Amount redeemed in accordance with manager agreement |  |  |  |  | 18 | $ 4 |  |
Investment funds total fair value |  |  |  |  | $ 4 |  | $ 17 |

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