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RESERVE FOR LOSSES AND LAE - Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 20, 2019 USD ($) | Dec. 31, 2023 USD ($) group_ | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2015 USD ($)
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Current year losses |  | $ 8,432 | $ 8,102 | $ 7,400 |
Prior years |  | $ (5) | (2) | $ (9) |
Number of exposure groupings | group_ |  | 200 |  |  |
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 |  |  |  |
Increase (decrease) in A&E reserves |  |  | 138 |  |
Reinsurance recoverable for paid and unpaid losses |  | $ 2,300 | 2,200 |  |
Munich Reinsurance Company |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses |  | 266 |  |  |
Endurance Re |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses |  | $ 163 |  |  |
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 |  | 11.80% |  |  |
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 |  | 7.20% |  |  |
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 |  | $ 916 | 45 |  |
Prior years |  | (397) | 392 |  |
Catastrophe Losses |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Current year losses |  | (585) | $ (80) |  |
Mt Logan Re |  |  |  |  |
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items] |  |  |  |  |
Reinsurance recoverable for paid and unpaid losses |  | $ 413 |  |  |
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 |  | 18.30% |  |  |

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