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Reserve for Unpaid Losses and Loss Adjustment Expenses - Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Prior accident years reserve development |  |  |  |
Unpaid losses and loss adjustment expenses | $ 41,243 | $ 39,659 |  |
Reinsurance Recoverables, Gross | 7,071 | 6,622 |  | $ 5,641
Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 229 | 246 | $ 312 |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |
Prior accident years reserve development |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 0 | 91 | 102 |
Reinsurance Recoverables, Gross | 300 |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Maximum |  |  |  |
Prior accident years reserve development |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 300 |  |  |
Catastrophes | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (62) | (154) | (529) |
Asbestos and Environmental |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] |  |  | 218 |
Change in Deferred Gain on Retroactive Reinsurance | 229 | 155 | 210 |
Liability for Asbestos and Environmental Claims, Gross, Period Increase (Decrease) | 229 | 155 | 218 |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 256 |  |  |
Asbestos and Environmental | Maximum |  |  |  |
Prior accident years reserve development |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 1,500 |  |  |
Asbestos and Environmental | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 0 | 0 | (2) |
Unpaid losses and loss adjustment expenses | 2,284 |  |  |
Asbestos and Environmental | Reinsurance Policy, Type [Axis]: Asbestos and Environmental | Maximum |  |  |  |
Prior accident years reserve development |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy | 1,500 |  |  |
Net asbestos reserves |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 162 | 106 | 127 |
Net environmental reserves |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 67 | 49 | 91 |
Workers’ compensation | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (204) | (190) | (110) |
Unpaid losses and loss adjustment expenses | 13,377 |  |  |
Workers’ compensation | COVID-19 related Claims | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 14 |  |  |
Workers’ compensation discount accretion | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 36 | 35 | 35 |
General liability | Abuse Claims [Member] |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] |  |  | 254 |
Unpaid losses and loss adjustment expenses | 787 |  |  |
General liability | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 56 | 454 | 237 |
Unpaid losses and loss adjustment expenses | 6,484 |  |  |
Marine [Member] | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 2 | 1 | 3 |
Unpaid losses and loss adjustment expenses | 578 |  |  |
Package business | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (39) | (91) | (58) |
Unpaid losses and loss adjustment expenses | 2,201 |  |  |
Professional liability | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (11) | (2) | (14) |
Unpaid losses and loss adjustment expenses | 2,050 |  |  |
Bond | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (32) | (26) | (19) |
Unpaid losses and loss adjustment expenses | 467 |  |  |
Assumed Reinsurance [Member] | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 19 | (6) | (6) |
Unpaid losses and loss adjustment expenses | 464 |  |  |
Uncollectible reinsurance | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 3 | (6) | (8) |
Other | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 27 | 42 | 54 |
Property and Casualty Insurance Products |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 36 | 199 | (136) |
Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit | (193) | (47) | (448) |
Unpaid losses and loss adjustment expenses | 33,083 | 31,449 | 29,622 | $ 28,261
Property and Casualty Insurance Products | Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |
Prior accident years reserve development |  |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 229 | 246 | 312 |
P&C Commercial Lines | Property | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (11) | (26) | (4) |
Unpaid losses and loss adjustment expenses | 914 |  |  |
P&C Commercial Lines | Automobile liability | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | 38 | 9 | 27 |
Unpaid losses and loss adjustment expenses | 1,337 |  |  |
P&C Personal Lines | Property | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (1) | 3 | 7 |
P&C Personal Lines | Automobile liability | Segment Reconciling Items |  |  |  |
Prior accident years reserve development |  |  |  |
Prior accident year development [1] | (14) | $ (90) | $ (61) |
Unpaid losses and loss adjustment expenses | $ 1,417 |  |  |

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