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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Workers’ compensation |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | $ (164) | $ (79) | $ (119)
Workers’ compensation discount accretion |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 40 | 28 | 28
General liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 52 | 11 | 65
Package business |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (26) | (25) | 65
Professional liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (12) | 1 | (37)
Bond |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 2 | 32 | (8)
Net asbestos reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 0 | 0 | 197
Net environmental reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 0 | 0 | 71
Catastrophes |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (49) | (16) | (7)
Uncollectible reinsurance |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 22 | (15) | (30)
Other |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 38 | 27 | 24
Property and Casualty, Commercial Insurance Product Line [Member] | Property |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (12) | (8) | 1
Property and Casualty, Commercial Insurance Product Line [Member] | Automobile liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (15) | 17 | 57
Property and Casualty, Personal Insurance Product Line [Member] | Property |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (25) | (14) | (10)
Property and Casualty, Personal Insurance Product Line [Member] | Automobile liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (18) | 0 | 160
Property and Casualty Insurance Products |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (167) | $ (41) | $ 457
Scenario, Adjustment [Member] | Catastrophes |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | $ 133 |  |

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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