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Goodwill Level 4 (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) segments | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Goodwill [Line Items] |  |  |  |
Gross |  | $ 853 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | (355) |  |
Carrying Value |  | 498 | $ 498 |
Goodwill, Written off Related to Sale of Business Unit |  |  |  | $ 156
Group Benefits [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  | 0 | $ 0 |
Annual Impairment Test Margin, Percent |  |  | 10.00% |
Corporate Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  |  | $ 0 |
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross |  | 119 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | 0 |  |
Carrying Value |  | 119 |  |
Goodwill impairment loss |  | 0 |  |
Mutual Funds [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross |  | 149 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | 0 |  |
Carrying Value |  | $ 149 |  |
Individual Life [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  |  | 0 |
Retirement Plans [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  |  | $ 0 |
Annual Impairment Test Margin, Percent |  | 10.00% |  |
Number of Company Reporting Segments which completed interim impairment test | segments |  | 2 |  |
Corporate [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Gross |  | $ 585 |  |
Goodwill, Impaired, Accumulated Impairment Loss | [1] | (355) |  |
Carrying Value |  | 230 |  |
Group Benefits [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Carrying Value |  | 138 |  |
Mutual Funds [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Carrying Value |  | $ 92 |  |
[1] | Carrying value as of December 31, 2015 and 2014 includes $138 and $92 for the Group Benefits and Mutual Funds reporting units, respectively.

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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 -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 + Details
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