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Segment Information - Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 225,260 | $ 224,576 |
Reinsurance recoverables, net | 4,061 | 3,659 |
Operating Segments | Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 31,281 | 29,845 |
Operating Segments | Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 6,251 | 6,091 |
Operating Segments | Property & Casualty Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 3,568 | 4,732 |
Operating Segments | Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 14,478 | 8,825 |
Operating Segments | Mutual Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 547 | 480 |
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 169,135 | 174,603 |
Reinsurance recoverables, net | 349 | 366 |
Scenario, Adjustment | Operating Segments | Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets |  | (8) |
Scenario, Adjustment | Operating Segments | Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets |  | 8 |
Property and Casualty Insurance Products | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Reinsurance recoverables, net | 3,476 | 3,085 |
Property and Casualty Insurance Products | Operating Segments | Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Liability for unpaid losses and loss adjustment expense, held for sale | 688 | 712 | $ 743
Reinsurance recoverables, net | $ 688 | $ 712 |

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: 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)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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