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RESERVE FOR LOSSES AND LAE - Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 20, 2019 USD ($) | Dec. 31, 2024 USD ($) group | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2015 USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Current year losses |  | $ 9,967 | $ 8,432 | $ 8,102 |
Prior years |  | $ 1,337 | (5) | (2) |
Number of exposure groupings | group |  | 250 |  |  |
Contracts of insurance and reinsurance received claims during the past three years, in years |  | 20 years |  |  |
Liabilities retroceded, percentage |  |  |  |  | 100.00%
Retrocession agreement, consideration transferred |  |  |  |  | $ 140
Maximum liability retroceded | $ 450 |  |  |  | 440
Total amount of liabilities retroceded |  |  |  |  | $ 300
Decrease in amount of liabilities retroceded | $ 43 |  |  |  |
Reinsurance recoverable for paid and unpaid losses |  | $ 3,100 | 2,300 |  |
Asbestos And Environmental Reserves |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Prior years |  | 54 |  |  |
Munich Reinsurance Company |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses |  | 316 |  |  |
Endurance Re |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses |  | $ 187 |  |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk | Munich Reinsurance Company |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 10.10% |  |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk | Endurance Re |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 6.00% |  |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk | Other Retrocessionaire |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 5.00% |  |  |
Higher Premiums Earned |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Current year losses |  | $ 1,100 |  |  |
Higher Premiums Earned | Reinsurance |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Prior years |  | 684 |  |  |
Catastrophe Losses |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Current year losses |  | 423 | 585 |  |
Attritional Losses |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Prior years |  |  | (401) | $ 110 |
Attritional Losses | Insurance |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Prior years |  | 1,100 | $ 285 |  |
Attritional Losses | Other |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Prior years |  | 403 |  |  |
Mt Logan Re |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses |  | $ 395 |  |  |
Mt Logan Re | Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | Reinsurer Concentration Risk |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 12.60% |  |  |

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