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Segment Information - Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | $ 985 | $ (166) | $ 289
Operating Segments | Commercial Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 377 | 415 | 403
Operating Segments | Personal Lines |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 26 | (23) | 88
Operating Segments | Property & Casualty Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 24 | (355) | (47)
Operating Segments | Group Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 38 | 83 | 63
Operating Segments | Mutual Funds |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | 63 | 43 | 48
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Income tax expense (benefit) | $ 457 | $ (329) | $ (266)

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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