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Reinsurance Level 4 Reinsurance Recoverable (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverable for Paid Claims and Claims Adjustments | $ 161,000,000 | $ 170,000,000
Reinsurance Recoverables on Unpaid Losses, Gross | 2,449,000,000 | 2,662,000,000
Premiums Receivable, Allowance for Doubtful Accounts | (165,000,000) | (266,000,000)
Reinsurance Recoverables, Including Reinsurance Premium Paid | 23,311,000,000 | 23,189,000,000
Fair Value, Concentration of Risk, Investments | 0 | 0
Asbestos and Environmental [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 1,655,000,000 |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 1,500,000,000 |
Property, Liability and Casualty Insurance Product Line [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 5,088,000,000 |
Gross reinsurance recoverable | 2,538,000,000 | 2,781,000,000
Reinsurance Recoverables, Including Reinsurance Premium Paid | 2,373,000,000 | 2,515,000,000
Life Insurance Product Line [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 20,938,000,000 | 20,674,000,000
Life Insurance Product Line [Member] | Continuing Operations [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 1,209,000,000 | 1,305,000,000
P&C Runoff Subsidiaries [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments | 178,000,000 |
Retirement Plans and Individual Life Businesses [Member] | Life Insurance Product Line [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 19,729,000,000 | 19,369,000,000
Retirement Plans [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 8,600,000,000 | 8,600,000,000
Individual Life [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverables, Including Reinsurance Premium Paid | 11,100,000,000 | 10,800,000,000
Reinsurance Recoverable [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Fair Value, Concentration of Risk, Investments | 0 |
Premium [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Payments for Reinsurance | 650,000,000 |
Reinsurance Payable | 650,000,000 |
Property and Casualty Insurance Subsidiaries [Member] |  |
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items] |  |
Reinsurance Recoverables on Paid Losses, Gross | $ 89,000,000 | $ 119,000,000

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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: 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.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, policy benefits and policy reserves. Excludes premiums paid under reinsurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 + Details
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