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Related Party Transactions (Details)
$ in Millions
3 Months Ended 12 Months Ended
May 05, 2022
item
Oct. 01, 2020
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2024
USD ($)
Related Party Transaction          
Revenues from operating leases       $ 15  
Number of portfolios | item 2        
Mr. Icahn and affiliates          
Related Party Transaction          
Noncontrolling Interest in Variable Interest Entity     $ 1,400   $ 1,500
Percentage of assets under management     35.00%    
Brett Icahn          
Related Party Transaction          
Portfolio manager term 7 years 7 years      
Number of lump sum payment after term | item 1        
Expense sharing arrangement | Consolidated VIE          
Related Party Transaction          
Amount of transaction with related party     $ 3 5  
Brett Icahn          
Related Party Transaction          
Amount redeemed in accordance with manager agreement     0 $ 5  
Investment funds total fair value     $ 15   $ 17