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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Workers’ compensation |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | $ (79) | $ (119) | $ (37)
Workers’ compensation discount accretion |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 28 | 28 | 29
Liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 11 | 65 | 8
Package business |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (25) | 65 | 28
Commercial property |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (8) | 1 | (6)
Professional liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 1 | (37) | (36)
Bond |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 32 | (8) | (2)
Commercial automobile liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 17 | 57 | 62
Automobile liability |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 0 | 160 | (8)
Homeowners |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (14) | (10) | 9
Net asbestos reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 0 | 197 | 146
Net environmental reserves |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 0 | 71 | 55
Catastrophes |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (16) | (7) | (18)
Uncollectible reinsurance |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | (15) | (30) | 0
Other reserve re-estimates, net |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | 27 | 24 | 20
Property and Casualty Insurance Products |  |  |
Prior accident years reserve development |  |  |
Prior accident year development | $ (41) | $ 457 | $ 250

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e575016-122915 + Details
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