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Basis of Presentation and Accounting Policies Revenue subject to updated guidance (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2018
Disaggregation of Revenue [Abstract] |
Revenue subject to updated guidance | Revenue from Non-Insurance Contracts with Customers
|  | Three months ended March 31,
| Revenue Line Item | 2018 | 2017
Commercial Lines |  |  |
Installment billing fees | Fee income | $ | 9 |  | $ | 10 |
Personal Lines |  |  |
Installment billing fees | Fee income | 10 |  | 11 |
Insurance servicing revenues | Other revenues | 19 |  | 19 |
Group Benefits |  |  |
Administrative services | Fee income | 44 |  | 19 |
Mutual Funds |  |  |
Advisor, distribution and other management fees | Fee income | 238 |  | 212 |
Other fees | Fee income | 20 |  | 26 |
Corporate | Fee income | 2 |  | 1 |
Total revenues subject to updated guidance |  | $ | 342 |  | $ | 298 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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