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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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