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RELATED PARTY TRANSACTIONS - Narrative (Details) - Related Party - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
BPO      
Related Party Transaction [Line Items]      
Deposit assets $ 273,000,000   $ 266,000,000
Equity Commitment Agreement      
Related Party Transaction [Line Items]      
Equity commitment 2,000,000,000.0    
Related party agreements and transactions 0   $ 0
Subsidiaries Investments      
Related Party Transaction [Line Items]      
Payments to acquire investments $ 4,200,000,000 $ 1,600,000,000