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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 |  |

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- Definition Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, net of estimated reinsurance recoveries. + 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 (cc) -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 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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