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Reserves for Future Policy Benefits and Unpaid Losses and Loss Adjustment Expenses Level 4 Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | $ 250 | $ 228 | $ 192
Auto liability [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 54 | 25 | 144
Homeowners [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 9 | (7) | (6)
Professional Liability [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (36) | (17) | (29)
Package Business [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 28 | 3 | 2
Accident and Health Insurance Product Line [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (37) | (7) | (2)
Workers Compensation NY Section 25A [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | 0 | 80
General liability [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 8 | (25) | (75)
Fidelity and Surety [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (2) | 8 | (8)
Commercial property [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (6) | 2 | (7)
Net asbestos reserves [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 146 | 212 | 130
Net environmental reserves [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 55 | 30 | 12
Uncollectible reinsurance [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 0 | 0 | (25)
Change in workers compensation discount, including accretion [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 29 | 30 | 30
Catastrophes [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (18) | (45) | (63)
Other reserve re-estimates [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | $ 20 | $ 19 | $ 9

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- Definition Prior accident years reserve development. + References No definition available. + Details
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- Definition The amount of the other adjustment made to the claims reserves during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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