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Goodwill Level 4 (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 USD ($) segments | Dec. 31, 2015 USD ($) | Jul. 29, 2016 USD ($) | Dec. 31, 2014 USD ($)
Goodwill [Line Items] |  |  |  |
Carrying Value | $ 567 | $ 498 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | $ 69 |
Group Benefits [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss | 0 | 0 |  |
Corporate Segment [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment loss |  | 0 |  |
Property and Casualty, Personal Insurance Product Line [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Carrying Value | 119 | 119 |  | $ 119
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 0 |
Goodwill impairment loss | $ 0 |  |  |
Mutual Funds [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
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 |  | 585
Goodwill, Impaired, Accumulated Impairment Loss |  | 355 |  | 355
Carrying Value | $ 230 | 230 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 0 |
Commercial Lines [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Carrying Value | 38 | 0 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 38 |
Mutual Fund [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Carrying Value | 180 | 149 |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | $ 31 |
Mutual Funds [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Carrying Value | 92 | 92 |  | 92
Group Benefits [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Carrying Value | $ 138 | $ 138 |  | $ 138

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