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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

X

- 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

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X

- 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

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- Definition

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+ References

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