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Related Party Transactions (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Other (loss) income, net	$ (24,000,000)	$ (18,000,000)
Mr. Icahn and affiliates
Related Party Transaction [Line Items]
Percentage of assets under management	54.00%		54.00%
Noncontrolling Interest in Variable Interest Entity	$ 5,500,000,000		$ 5,000,000,000.0
Expense sharing arrangement | Consolidated VIE
Related Party Transaction [Line Items]
Amount of transaction with related party	3,000,000	5,000,000
Automotive Segment
Related Party Transaction [Line Items]
Other (loss) income, net	2,000,000	(1,000,000)
Automotive Segment | 767 Leasing
Related Party Transaction [Line Items]
Contribution to non-consolidated VIE	0	11,000,000
Investment Segment
Related Party Transaction [Line Items]
Other (loss) income, net	(17,000,000)	(21,000,000)
Brett Icahn
Related Party Transaction [Line Items]
Amount contributed in accordance with manager agreement		$ 40,000,000
Investment funds total fair value	$ 86,000,000		$ 93,000,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 220
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