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Commitments and Contingencies Level 4 (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]      
Minimum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund $ 0.01    
Leases [Abstract]      
Operating Leases, Rent Expense 53,000,000 $ 60,000,000 $ 62,000,000
Operating Leases, Income Statement, Sublease Revenue 2,000,000 3,000,000 $ 4,000,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months 42,000,000    
Operating Leases, Future Minimum Payments, Due in Two Years 35,000,000    
Operating Leases, Future Minimum Payments, Due in Three Years 28,000,000    
Operating Leases, Future Minimum Payments, Due in Four Years 20,000,000    
Operating Leases, Future Minimum Payments, Due in Five Years 10,000,000    
Operating Leases, Future Minimum Payments, Due Thereafter 28,000,000    
Operating Leases, Future Minimum Payments Due 163,000,000    
Operating Leases, Future Minimum Payments Receivable, Current 2,000,000    
Operating Leases, Future Minimum Payments Receivable, in Two Years 2,000,000    
Operating Leases, Future Minimum Payments Receivable, in Three Years 2,000,000    
Operating Leases, Future Minimum Payments Receivable, in Four Years 2,000,000    
Operating Leases, Future Minimum Payments Receivable, in Five Years 0    
Operating Leases, Future Minimum Payments Receivable, Thereafter 0    
Unfunded Commitments [Abstract]      
Unfunded Commitments 1,600,000,000    
Commitments to Fund Limited Partnership and Other Alternative Investments 1,200,000,000    
Commitment to fund Private placement securities 313,000,000    
Commitments to Fund Mortgage Loans 95,000,000    
Derivative Liability [Abstract]      
Derivative, Net Liability Position, Aggregate Fair Value 1,400,000,000    
Collateral Already Posted, Aggregate Fair Value 1,700,000,000    
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund 0.02    
Guaranty Liabilities 134,000,000 138,000,000  
Reinsurance Recoverables, Including Reinsurance Premium Paid 23,311,000,000 23,189,000,000  
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 298,000,000 550,000,000  
Net Asbestos Reserves [Member]      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Net 1,400,000,000    
Net Environmental Reserves [Member]      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Net 292,000,000    
GMWB Product Derivatives [Member]      
Derivative Liability [Abstract]      
Collateral Already Posted, Aggregate Fair Value 31,000,000    
Other Assets [Member]      
Derivative Liability [Abstract]      
Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset 34,000,000 $ 44,000,000  
Premium [Member]      
Derivative Liability [Abstract]      
Payments for Reinsurance 650,000,000    
Asbestos and Environmental [Member]      
Derivative Liability [Abstract]      
Reinsurance Recoverables, Including Reinsurance Premium Paid 1,500,000,000    
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 390,000,000    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 1,655,000,000    
Cash and Cash Equivalents [Member]      
Derivative Liability [Abstract]      
Collateral Already Posted, Aggregate Fair Value $ 10,000,000