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Business Dispositions and Discontinued Operations - Additional Information (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 03, 2017 | May 10, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Loss on discontinued operations |  |  | $ 3,257,000,000 | $ 81,000,000 | $ (6,000,000)
Reinsurance recoverables, net |  |  | 4,061,000,000 | 3,659,000,000 |
Operating Segments | Property and Casualty Insurance Products |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Reinsurance recoverables, net |  |  | 3,476,000,000 | 3,085,000,000 |
Operating Segments | Commercial Lines | Property and Casualty Insurance Products |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Liability for unpaid losses and loss adjustment expense, held for sale |  |  | 688,000,000 | 712,000,000 | 743,000,000
Reinsurance recoverables, net |  |  | 688,000,000 | 712,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Capital loss from transaction |  | $ 5,000,000 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | P&C Runoff Subsidiaries |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash proceeds from sale of business |  | $ 272,000,000 |  |  |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash proceeds from sale of business | $ 1.4 |  |  |  |
Loss on discontinued operations |  |  | 3,257,000,000 | 0 | $ 0
Dividends paid | $ 0 |  |  |  |
Ownership interest retained, percentage | 9.70% |  |  |  |
Ownership interest retained | $ 164,000,000 |  |  |  |
Reduction in long term debt | 142,000,000 |  | 142,000,000 | 142,000,000 |
Consideration received | $ 1,500,000,000 |  |  |  |
Income tax benefits retained |  |  | 700,000,000 |  |
Operating loss carryforwards retained |  |  | 437,000,000 |  |
Tax credits retained |  |  | 235,000,000 |  |
Adjustments to AOCI |  |  | 1,000,000,000 |  |
Management agreement term | 5 years |  |  |  |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business | Minimum |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Transition services agreement term | 12 months |  |  |  |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business | Maximum |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Transition services agreement term | 24 months |  |  |  |
Discontinued Operations, Held-for-sale | Run-Off Life and Annuity Business | Operating Segments | Commercial Lines | Property and Casualty Insurance Products |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Liability for unpaid losses and loss adjustment expense, held for sale |  |  | 688,000,000 | 712,000,000 |
Reinsurance recoverables, net |  |  | $ 688,000,000 | $ 712,000,000 |

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