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Reserve for Unpaid Losses and Loss Adjustment Expenses - Prior Accident Years Reserve Development (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Prior accident years reserve development |  |  |
Change in Deferred Gain on Retroactive Reinsurance | $ 16,000,000 | $ 0 | $ 0
Workers’ compensation |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (120,000,000) | (164,000,000) | (79,000,000)
Workers’ compensation discount accretion |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 33,000,000 | 40,000,000 | 28,000,000
General liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 61,000,000 | 52,000,000 | 11,000,000
Marine [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 8,000,000 | 0 | 0
Package business |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (47,000,000) | (26,000,000) | (25,000,000)
Property |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 3,000,000 | (25,000,000) | (14,000,000)
Professional liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 29,000,000 | (12,000,000) | 1,000,000
Bond |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (3,000,000) | 2,000,000 | 32,000,000
Assumed Reinsurance [Member] |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 3,000,000 | 0 | 0
Net asbestos reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 0 | 0 | 0
Net environmental reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 0 | 0 | 0
Catastrophes |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (42,000,000) | (49,000,000) | (16,000,000)
Uncollectible reinsurance |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (30,000,000) | 22,000,000 | (15,000,000)
Other |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 46,000,000 | 38,000,000 | 27,000,000
Property and Casualty Insurance Products |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (65,000,000) | (167,000,000) | (41,000,000)
Prior Year Claims and Claims Adjustment Expense, net of retroactive reinsurance benefit | (81,000,000) | (167,000,000) | (41,000,000)
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member] | Minimum [Member] |  |  |
Prior accident years reserve development |  |  |
Gain Contingency, Unrecorded Amount | 300,000,000 |  |
PG&E [Member] | Portion of Expected Class Settlement Due to HIG [Member] | Maximum |  |  |
Prior accident years reserve development |  |  |
Gain Contingency, Unrecorded Amount | 325,000,000 |  |
Property and Casualty, Commercial Insurance [Member] | Property |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | (11,000,000) | (12,000,000) | (8,000,000)
Property and Casualty, Commercial Insurance [Member] | Automobile liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | 27,000,000 | (15,000,000) | 17,000,000
Property and Casualty, Personal Insurance [Member] | Automobile liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development [1] | $ (38,000,000) | $ (18,000,000) | $ 0

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