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Related Party Transactions (Details) $ in Millions				11 Months Ended	12 Months Ended
	Feb. 06, 2023 USD ($)	May 05, 2022 item	Oct. 01, 2020 shares	Dec. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 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				$ 2,100	$ 1,500	$ 2,100
Percentage of assets under management				39.00%	35.00%	39.00%
Auto Plus
Related Party Transaction
Estimated amount of proceeds from repayment of notes receivable					$ 48
Write-off of notes receivable					127
Repayment of notes receivable					11
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	$ 400
Investment in funds | Mr. Icahn and affiliates
Related Party Transaction
Investment funds					256	158
Redemption of investment funds					250	2,000
Amount redeemed in accordance with manager agreement						242
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					19	18	$ 18
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					60	56	45
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					10	17	$ 7
Incentive Plan 2017 | Restricted depositary units
Related Party Transaction
Grants of restricted depository units | shares			239,254
Vesting period			7 years
Brett Icahn
Related Party Transaction
Amount redeemed in accordance with manager agreement					4	17
Investment funds total fair value					$ 17	$ 28

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