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RELATED PARTY TRANSACTIONS - Summary of Amounts Included in Condensed Consolidated Statements of Income Related to Fee for Service Arrangement (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related Party Transaction [Line Items]        
Equity in earnings from unconsolidated affiliates $ 18 $ 12 $ 13  
Commissions and other fees 4,981 3,978 3,835  
Related Party        
Related Party Transaction [Line Items]        
Equity in earnings from unconsolidated affiliates 18 12 13  
Commissions and other fees $ 165 $ 204 $ 200 $ 1