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Goodwill & Other Intangible Assets - Goodwill Carrying Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Beginning balance | $ 567 | $ 498
Goodwill related to acquisitions | 723 | 69
Ending balance | 1,290 | 567
Operating Segments | Small Commercial |  |
Goodwill [Roll Forward] |  |
Beginning balance | 38 | 0
Goodwill related to acquisitions | 0 | 38
Ending balance | 38 | 38
Operating Segments | Personal Lines |  |
Goodwill [Roll Forward] |  |
Beginning balance | 119 | 119
Goodwill related to acquisitions | 0 | 0
Ending balance | 119 | 119
Operating Segments | Mutual Funds |  |
Goodwill [Roll Forward] |  |
Beginning balance | 180 | 149
Goodwill related to acquisitions | 0 | 31
Ending balance | 180 | 180
Operating Segments | Group Benefits |  |
Goodwill [Roll Forward] |  |
Beginning balance | 0 | 0
Goodwill related to acquisitions | 723 | 0
Ending balance | 723 | 0
Corporate |  |
Goodwill [Roll Forward] |  |
Beginning balance | 230 | 230
Goodwill related to acquisitions | 0 | 0
Ending balance | 230 | 230
Corporate | Group Benefits |  |
Goodwill [Roll Forward] |  |
Beginning balance | 138 | 138
Ending balance | 0 | 138
Corporate | Mutual Funds |  |
Goodwill [Roll Forward] |  |
Beginning balance | 92 | 92
Ending balance | $ 0 | $ 92

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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