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Segment Information - Net Investment Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Net investment income | $ 1,603 | $ 1,577 | $ 1,561
Operating Segments | Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 949 | 917 | 910
Operating Segments | Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 141 | 135 | 128
Operating Segments | Property & Casualty Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 106 | 127 | 133
Operating Segments | Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 381 | 366 | 371
Operating Segments | Mutual Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | 3 | 1 | 1
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Net investment income | $ 23 | $ 31 | $ 18

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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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