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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Prior Accident Years Reserve Development (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Group Insurance Policies [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | $ (162) | $ (146) | $ (223)
Group Insurance Policies [Member] | Long-term Disability [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 90 | 90 | 150
Group Insurance Policies [Member] | group life term, disability and accident [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 75 | 50 | 65
Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 457 | 250 | 228
Property, Liability and Casualty Insurance Product Line [Member] | Accident and Health Insurance Product Line [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (119) | (37) | (7)
Property, Liability and Casualty Insurance Product Line [Member] | Change in Workers Compensation Discount Including Accretion [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 28 | 29 | 30
Property, Liability and Casualty Insurance Product Line [Member] | General liability [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 65 | 8 | (25)
Property, Liability and Casualty Insurance Product Line [Member] | Package Business [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 65 | 28 | 3
Property, Liability and Casualty Insurance Product Line [Member] | Commercial Property [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 1 | (6) | 2
Property, Liability and Casualty Insurance Product Line [Member] | Professional Liability [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (37) | (36) | (17)
Property, Liability and Casualty Insurance Product Line [Member] | Surety Product Line [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (8) | (2) | 8
Property, Liability and Casualty Insurance Product Line [Member] | Auto liability [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 217 | 54 | 25
Property, Liability and Casualty Insurance Product Line [Member] | Homeowners [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (10) | 9 | (7)
Property, Liability and Casualty Insurance Product Line [Member] | Net asbestos reserves [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 197 | 146 | 212
Property, Liability and Casualty Insurance Product Line [Member] | Net environmental reserves [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 71 | 55 | 30
Property, Liability and Casualty Insurance Product Line [Member] | Catastrophes [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (7) | (18) | (45)
Property, Liability and Casualty Insurance Product Line [Member] | Uncollectible Reinsurance [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | (30) | 0 | 0
Property, Liability and Casualty Insurance Product Line [Member] | Other reserve re-estimates [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | 24 | 20 | 19
Property, Liability and Casualty Insurance Product Line [Member] | Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Prior accident years reserve development |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) | $ 457 | $ 250 | $ 228

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- Definition Amount, after effects of reinsurance, of increase (decrease) in the liability for unpaid claims and claims adjustment expense. + 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=65670824&loc=d3e14764-158437 + Details
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