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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
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