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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 |

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