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Related Party Transactions (Details) $ in Millions				3 Months Ended		8 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) shares	May 05, 2022 item	Oct. 01, 2020	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jan. 31, 2023 USD ($)
Related Party Transaction
Number of portfolios | item		2
Note receivable, net	$ 59			$ 59		$ 59	$ 59
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	$ 2,300			$ 2,300		$ 2,300	$ 2,300		$ 4,900
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							59
Write-off of notes receivable							127
Investment in funds | Mr. Icahn and affiliates
Related Party Transaction
Redemption of investment funds							2,022		0
Expense sharing arrangement | Consolidated VIE
Related Party Transaction
Amount of transaction with related party							10	$ 8
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				14	$ 13		43	35
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				$ 3	$ 2		15	5
Brett Icahn
Related Party Transaction
Amount redeemed in accordance with manager agreement							9	$ 16
Investment funds total fair value							$ 36		$ 50
Brett Icahn | Incentive Plan 2017 [Member]
Related Party Transaction
2017 LTIP units vested | shares	4,973

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