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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | $ 312 | $ 16 | $ 0
Adverse Development Cover Navigators Group [Member] |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 102 | 16 |
Deferred Revenue | 118 |  |
Catastrophes | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (529) | (42) | (49)
Net asbestos reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 127 |  |
Net asbestos reserves | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (2) | 0 | 0
Net environmental reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 91 |  |
Net environmental reserves | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 0 | 0 | 0
Asbestos and Environmental |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 218 |  |
Change in Deferred Gain on Retroactive Reinsurance | 210 |  |
Workers’ compensation | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (110) | (120) | (164)
Workers’ compensation discount accretion | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 35 | 33 | 40
General liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 237 | 61 | 52
Marine [Member] | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 3 | 8 | 0
Package business | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (58) | (47) | (26)
Professional liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (14) | 29 | (12)
Bond | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (19) | (3) | 2
Assumed Reinsurance [Member] | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (6) | 3 | 0
Uncollectible reinsurance | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (8) | (30) | 22
Other | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 54 | 46 | 38
Property and Casualty Insurance Products |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (136) | (65) | (167)
Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit | (448) | (81) | (167)
Property and Casualty Insurance Products | Adverse Development Cover Navigators Group [Member] |  |  |
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 312 | 16 | 0
P&C Commercial Lines | Property | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (4) | (11) | (12)
P&C Commercial Lines | Automobile liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 27 | 27 | (15)
P&C Personal Lines | Property | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 7 | 3 | (25)
P&C Personal Lines | Automobile liability | Segment Reconciling Items |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | $ (61) | $ (38) | $ (18)

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