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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | $ 246 | $ 312 | $ 16
Adverse Development Cover Navigators Group [Member] |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 91 | 102 | 16
Catastrophes | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (154) | (529) | (42)
Asbestos and Environmental |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] |  | 218 |
Change in Deferred Gain on Retroactive Reinsurance | 155 | 210 |
Asbestos and Environmental | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 0 | (2) | 0
Workers’ compensation | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (190) | (110) | (120)
Workers’ compensation discount accretion | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 35 | 35 | 33
General liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 454 | 237 | 61
Marine [Member] | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 1 | 3 | 8
Package business | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (91) | (58) | (47)
Professional liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (2) | (14) | 29
Bond | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (26) | (19) | (3)
Assumed Reinsurance [Member] | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (6) | (6) | 3
Uncollectible reinsurance | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (6) | (8) | (30)
Other | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 42 | 54 | 46
Property and Casualty Insurance Products |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 199 | (136) | (65)
Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit | (47) | (448) | (81)
Property and Casualty Insurance Products | Adverse Development Cover Navigators Group [Member] |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 246 | 312 | 16
P&C Commercial Lines | Property | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (26) | (4) | (11)
P&C Commercial Lines | Automobile liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 9 | 27 | 27
P&C Personal Lines | Property | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 3 | 7 | 3
P&C Personal Lines | Automobile liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | $ (90) | $ (61) | $ (38)

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