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Commitments and Contingencies Level 4 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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 |  | 60,000,000 | $ 62,000,000 | $ 79,000,000
Operating Leases, Income Statement, Sublease Revenue |  | 3,000,000 | 4,000,000 | $ 8,000,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  | 39,000,000 |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  | 33,000,000 |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 27,000,000 |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  | 19,000,000 |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  | 12,000,000 |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  | 13,000,000 |  |
Operating Leases, Future Minimum Payments Due | [1] | 143,000,000 |  |
Operating Leases, Future Minimum Payments Receivable, Current |  | 3,000,000 |  |
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 |  | 2,000,000 |  |
Operating Leases, Future Minimum Payments Receivable, Thereafter |  | 0 |  |
Unfunded Commitments [Abstract] |  |  |  |
Unfunded Commitments |  | 1,000,000,000 |  |
Commitments to Fund Limited Partnership and Other Alternative Investments |  | 748,000,000 |  |
Commitment to fund Private placement securities |  | 236,000,000 |  |
Commitments to Fund Mortgage Loans |  | 31,000,000 |  |
Derivative Liability [Abstract] |  |  |  |
Derivative, Net Liability Position, Aggregate Fair Value |  | 1,300,000,000 |  |
Collateral Already Posted, Aggregate Fair Value |  | 1,500,000,000 |  |
Maximum Percentage of Premiums Written Per Year to be Considered for Assessment Under Guaranty Fund |  | 0.02 |  |
Guaranty Liabilities |  | 138,000,000 | 131,000,000 |
Net Asbestos Reserves [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for Asbestos and Environmental Claims, Net |  | 1,700,000,000 |  |
Net Environmental Reserves [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Liability for Asbestos and Environmental Claims, Net |  | 256,000,000 | 247,000,000 |
GMWB Product Derivatives [Member] |  |  |  |
Derivative Liability [Abstract] |  |  |  |
Collateral Already Posted, Aggregate Fair Value |  | 34,000,000 |  |
Other Assets [Member] |  |  |  |
Derivative Liability [Abstract] |  |  |  |
Loss Contingency Accrual, Insurance-related Assessment, Premium Tax Offset |  | $ 44,000,000 | $ 42,000,000 |
[1] | Excludes expected future minimum sublease income of approximately $3, $2, $2, $2, $2 and $0 in 2016, 2017, 2018, 2019, 2020 and thereafter respectively.

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + Details
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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11049-110243 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11019-110243 + Details
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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 (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition The amount of insurance-related assessment liability that is expected to be recovered through a premium tax offset based on current laws applied to in-force policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 405 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392405&loc=d3e24119-109301 + Details
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