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RESERVE FOR LOSSES AND LAE - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Current year losses |  | $ 7,665 | $ 7,132
Prior year losses |  | 537 | $ 0
Aviation Losses |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior year losses |  | 98 |
Well-Seasoned Attritional Property Reserves |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Prior year losses |  | 59 |
Reinstatement Premiums |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Current year losses | $ 84 |  |
Current year losses, gross | $ 98 |  |
Higher Premiums Earned |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Increase in earned premium growth |  | 476 |
Aviation Losses |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Increase in earned premium growth |  | 83 |
Catastrophe Losses |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Increase in earned premium growth |  | $ 58 |

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