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RESERVE FOR LOSSES, LAE AND FUTURE POLICY BENEFIT RESERVE - Narrative (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Current year losses | $ 3,927 | $ 3,668 |  |
Estimated and recognized reinsurance recoveries | 2,175 | $ 1,986 | $ 2,105 | $ 1,946
Higher Premiums Earned |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Increase (decrease) in liability for unpaid claims and claims adjustment expense | 317 |  |  |
Catastrophe Losses |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Increase (decrease) in liability for unpaid claims and claims adjustment expense | (58) |  |  |
Hurricane |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Estimated and recognized reinsurance recoveries | $ 30 |  |  |

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